What’s an ad blocker?

An ad blocker is a program designed to make the Web cleaner and safer and protect your privacy. AdGuard blocks pop-up ads, banners, and video ads — even on YouTube. It removes cookies and tracking requests. It knows what websites are dangerous and ensures you don’t visit any of them.

Why is AdGuard better than other ad blockers?

Most ad blockers are browser extensions that can’t remove all types of ads. If you’re using more than one browser, you’ll need to install an ad-blocking extension for each of them. And if you want to block ads in apps, you just won’t be able to. AdGuard offers apps for Android, iOS, Windows, and Mac. With them, you can block ads in browsers and apps, prevent websites and companies from tracking you, and protect yourself from phishing and malware. AdGuard also speeds up page loading, allows you to manage DNS servers and web requests, and has in-app support. You can learn more from our comparison table.

How do I install AdGuard?

We have apps for all popular platforms. AdGuard for Windows, Mac, and Android can be downloaded directly from this page. AdGuard for iOS is available on the App Store. Installation shouldn't be a problem, but you can always check the instructions in our Knowledge base.

Does AdGuard Ad Blocker have free versions?

Our full-fledged apps for Windows, Mac, and Android offer you a free trial — that’s how you can discover all the features AdGuard has to offer. Our apps for Android and iOS also have free versions. They can be helpful as well: the free version of AdGuard for Android can block ads in browsers, and the free version of AdGuard for iOS blocks ads and trackers in Safari. But their functionality is limited: to block ads in apps, control DNS requests, protect yourself from malicious domains, and more, you’ll need a full version. AdGuard also has completely free browser extensions. To learn more about the difference between the AdGuard extensions and full-fledged apps, check out our comparison table.

Can I use AdGuard Ad Blocker on multiple devices?

Sure! AdGuard supports all popular platforms: Android, iOS, Windows, and Mac. The best way to use AdGuard on multiple devices is to buy a license, download the AdGuard app for the needed platform, and log in to it with your license key or AdGuard account credentials.

Why do I need to buy a license?

You don’t necessarily have to buy a license to use AdGuard. But here are some ideas about how it can make your life better: A license gives you access to advanced features of AdGuard for Android or iOS: ad blocking in apps, DNS protection, firewall, statistics, app management, and others. It also allows you to use AdGuard for Windows and Mac. With a license, you can use AdGuard on multiple devices and thus protect your family and friends. If you like AdGuard, that’s how you can support us.

Can I gift AdGuard Ad Blocker to a friend?

Sure! You can buy a license on a special page and enter the recipient's email — we'll send them a license with a nice gift card. Discounts are applied to gift licenses, too.

Is it safe to use AdGuard?

We’ve been developing privacy-oriented products since 2009 and have more than 160 million users worldwide. We never share your personal information with anyone and only collect strictly necessary data to run our websites and apps. You can read more in our Privacy policy.

Where can I read more about AdGuard?

If you want to know more about how exactly AdGuard products work, what filters are, how to create your own filtering rules, and more, check out our Knowledge base. For industry news, AdGuard releases, and promos, you can visit our blog. And if you’d like, you can watch our explanatory videos on AdGuard’s YouTube channel or follow us on social media.

I like AdGuard. How can I support you?

You can share AdGuard with your friends. Whether you buy more licenses and connect your loved ones to AdGuard, buy a license as a gift, share our posts on social networks, or just advise our products to someone you care about — we’re always glad to show more people how beautiful the safe and ad-free Web is. You can rate us in app stores and on our website. That’s how we know we’re on the right track. You can also become our contributor: maybe you’re good at translating, know how to improve our filters or the Knowledge base, or want to become a beta tester? We are grateful to our contributors and reward them in return — with AdGuard licenses and gifts.

Who do I contact if I have questions?

For any questions, you can always contact us at support@adguard.com.

What’s an ad blocker?

An ad blocker is a program designed to make the Web cleaner and safer and protect your privacy. AdGuard blocks pop-up ads, banners, and video ads — even on YouTube. It removes cookies and tracking requests. It knows what websites are dangerous and ensures you don’t visit any of them.

Why is AdGuard better than other ad blockers?

Most ad blockers are browser extensions that can’t remove all types of ads. If you’re using more than one browser, you’ll need to install an ad-blocking extension for each of them. And if you want to block ads in apps, you just won’t be able to. AdGuard offers apps for Android, iOS, Windows, and Mac. With them, you can block ads in browsers and apps, prevent websites and companies from tracking you, and protect yourself from phishing and malware. AdGuard also speeds up page loading, allows you to manage DNS servers and web requests, and has in-app support. You can learn more from our comparison table.

How do I install AdGuard?

We have apps for all popular platforms. AdGuard for Windows, Mac, and Android can be downloaded directly from this page. AdGuard for iOS is available on the App Store. Installation shouldn't be a problem, but you can always check the instructions in our Knowledge base.

Does AdGuard Ad Blocker have free versions?

Our full-fledged apps for Windows, Mac, and Android offer you a free trial — that’s how you can discover all the features AdGuard has to offer. Our apps for Android and iOS also have free versions. They can be helpful as well: the free version of AdGuard for Android can block ads in browsers, and the free version of AdGuard for iOS blocks ads and trackers in Safari. But their functionality is limited: to block ads in apps, control DNS requests, protect yourself from malicious domains, and more, you’ll need a full version. AdGuard also has completely free browser extensions. To learn more about the difference between the AdGuard extensions and full-fledged apps, check out our comparison table.

Can I use AdGuard Ad Blocker on multiple devices?

Sure! AdGuard supports all popular platforms: Android, iOS, Windows, and Mac. The best way to use AdGuard on multiple devices is to buy a license, download the AdGuard app for the needed platform, and log in to it with your license key or AdGuard account credentials.

Why do I need to buy a license?

You don’t necessarily have to buy a license to use AdGuard. But here are some ideas about how it can make your life better: A license gives you access to advanced features of AdGuard for Android or iOS: ad blocking in apps, DNS protection, firewall, statistics, app management, and others. It also allows you to use AdGuard for Windows and Mac. With a license, you can use AdGuard on multiple devices and thus protect your family and friends. If you like AdGuard, that’s how you can support us.

Can I gift AdGuard Ad Blocker to a friend?

Sure! You can buy a license on a special page and enter the recipient's email — we'll send them a license with a nice gift card. Discounts are applied to gift licenses, too.

Is it safe to use AdGuard?

We’ve been developing privacy-oriented products since 2009 and have more than 160 million users worldwide. We never share your personal information with anyone and only collect strictly necessary data to run our websites and apps. You can read more in our Privacy policy.

Where can I read more about AdGuard?

If you want to know more about how exactly AdGuard products work, what filters are, how to create your own filtering rules, and more, check out our Knowledge base. For industry news, AdGuard releases, and promos, you can visit our blog. And if you’d like, you can watch our explanatory videos on AdGuard’s YouTube channel or follow us on social media.

I like AdGuard. How can I support you?

You can share AdGuard with your friends. Whether you buy more licenses and connect your loved ones to AdGuard, buy a license as a gift, share our posts on social networks, or just advise our products to someone you care about — we’re always glad to show more people how beautiful the safe and ad-free Web is. You can rate us in app stores and on our website. That’s how we know we’re on the right track. You can also become our contributor: maybe you’re good at translating, know how to improve our filters or the Knowledge base, or want to become a beta tester? We are grateful to our contributors and reward them in return — with AdGuard licenses and gifts.

Who do I contact if I have questions?

For any questions, you can always contact us at support@adguard.com.

What’s an ad blocker?

An ad blocker is a program designed to make the Web cleaner and safer and protect your privacy. AdGuard blocks pop-up ads, banners, and video ads — even on YouTube. It removes cookies and tracking requests. It knows what websites are dangerous and ensures you don’t visit any of them.

Why is AdGuard better than other ad blockers?

Most ad blockers are browser extensions that can’t remove all types of ads. If you’re using more than one browser, you’ll need to install an ad-blocking extension for each of them. And if you want to block ads in apps, you just won’t be able to. AdGuard offers apps for Android, iOS, Windows, and Mac. With them, you can block ads in browsers and apps, prevent websites and companies from tracking you, and protect yourself from phishing and malware. AdGuard also speeds up page loading, allows you to manage DNS servers and web requests, and has in-app support. You can learn more from our comparison table.

How do I install AdGuard?

We have apps for all popular platforms. AdGuard for Windows, Mac, and Android can be downloaded directly from this page. AdGuard for iOS is available on the App Store. Installation shouldn't be a problem, but you can always check the instructions in our Knowledge base.

Does AdGuard Ad Blocker have free versions?

Our full-fledged apps for Windows, Mac, and Android offer you a free trial — that’s how you can discover all the features AdGuard has to offer. Our apps for Android and iOS also have free versions. They can be helpful as well: the free version of AdGuard for Android can block ads in browsers, and the free version of AdGuard for iOS blocks ads and trackers in Safari. But their functionality is limited: to block ads in apps, control DNS requests, protect yourself from malicious domains, and more, you’ll need a full version. AdGuard also has completely free browser extensions. To learn more about the difference between the AdGuard extensions and full-fledged apps, check out our comparison table.

Can I use AdGuard Ad Blocker on multiple devices?

Sure! AdGuard supports all popular platforms: Android, iOS, Windows, and Mac. The best way to use AdGuard on multiple devices is to buy a license, download the AdGuard app for the needed platform, and log in to it with your license key or AdGuard account credentials.

Why do I need to buy a license?

You don’t necessarily have to buy a license to use AdGuard. But here are some ideas about how it can make your life better: A license gives you access to advanced features of AdGuard for Android or iOS: ad blocking in apps, DNS protection, firewall, statistics, app management, and others. It also allows you to use AdGuard for Windows and Mac. With a license, you can use AdGuard on multiple devices and thus protect your family and friends. If you like AdGuard, that’s how you can support us.

Can I gift AdGuard Ad Blocker to a friend?

Sure! You can buy a license on a special page and enter the recipient's email — we'll send them a license with a nice gift card. Discounts are applied to gift licenses, too.

Is it safe to use AdGuard?

We’ve been developing privacy-oriented products since 2009 and have more than 160 million users worldwide. We never share your personal information with anyone and only collect strictly necessary data to run our websites and apps. You can read more in our Privacy policy.

Where can I read more about AdGuard?

If you want to know more about how exactly AdGuard products work, what filters are, how to create your own filtering rules, and more, check out our Knowledge base. For industry news, AdGuard releases, and promos, you can visit our blog. And if you’d like, you can watch our explanatory videos on AdGuard’s YouTube channel or follow us on social media.

I like AdGuard. How can I support you?

You can share AdGuard with your friends. Whether you buy more licenses and connect your loved ones to AdGuard, buy a license as a gift, share our posts on social networks, or just advise our products to someone you care about — we’re always glad to show more people how beautiful the safe and ad-free Web is. You can rate us in app stores and on our website. That’s how we know we’re on the right track. You can also become our contributor: maybe you’re good at translating, know how to improve our filters or the Knowledge base, or want to become a beta tester? We are grateful to our contributors and reward them in return — with AdGuard licenses and gifts.

Who do I contact if I have questions?

For any questions, you can always contact us at support@adguard.com.

19,801 19801 user reviews

Excellent!

Surf the Web ad-free and safely. Shields up!

Blocks all kinds of ads Removes annoying web elements Saves traffic and speeds up page loading Works for browsers and apps Maintains site functionality and appearance

19,801 19801 user reviews

Excellent!

AdGuard for Windows

AdGuard for Windows is more than an ad blocker. It is a multipurpose tool that blocks ads, controls access to dangerous sites, speeds up page loading, and protects children from inappropriate content.

AdGuard for Windows v7.22, 14-day trial period

19,801 19801 user reviews

Excellent!

AdGuard for Mac

AdGuard for Mac is a unique ad blocker designed with macOS in mind. In addition to protecting you from annoying ads in browsers and apps, it shields you from tracking, phishing, and fraud.

AdGuard for Mac v2.17, 14-day trial period

19,801 19801 user reviews

Excellent!

AdGuard for Android

AdGuard for Android is a perfect solution for Android devices. Unlike most other ad blockers, AdGuard doesn't require root access and provides a wide range of app management options.

AdGuard for Android v4.12, 14-day trial period

19,801 19801 user reviews

Excellent!

AdGuard for iOS

The best iOS ad blocker for iPhone and iPad. AdGuard eliminates all kinds of ads in Safari, protects your privacy, and speeds up page loading. AdGuard for iOS ad-blocking technology ensures the highest quality filtering and allows you to use multiple filters at the same time

AdGuard for iOS v4.5

19,801 19801 user reviews

Excellent!

AdGuard Content Blocker

AdGuard Content Blocker eliminates all kinds of ads in mobile browsers that support content-blocking technology — namely, Samsung Internet and Yandex Browser. Its features are limited compared to AdGuard for Android, but it is free, easy to install, and efficient

AdGuard Content Blocker v2.8

19,801 19801 user reviews

Excellent!

AdGuard Browser Extension

AdGuard is the fastest and most lightweight ad blocking extension that effectively blocks all types of ads on all web pages! Choose AdGuard for the browser you use and get ad-free, fast and safe browsing.

AdGuard Browser Extension v5.2

19,801 19801 user reviews

Excellent!

AdGuard Assistant

A companion browser extension for AdGuard desktop apps. It offers an in-browser access to such features as custom element blocking, allowlisting a website or sending a report.

AdGuard Assistant v1.4

19,801 19801 user reviews

Excellent!

AdGuard Home

AdGuard Home is a network-based solution for blocking ads and trackers. Install it once on your router to cover all devices on your home network — no additional client software required. This is especially important for various IoT devices that often pose a threat to your privacy

AdGuard Home v0.107

19,801 19801 user reviews

Excellent!

AdGuard Pro for iOS

AdGuard Pro for iOS comes with all the advanced ad-blocking protection features enabled. It offers the same tools as the paid version of AdGuard for iOS. It excels at blocking ads in Safari and lets you customize DNS settings to tailor your protection. It blocks ads in browsers and apps, protects your kids from inappropriate content, and keeps your personal data safe

AdGuard Pro for iOS v4.5

19,801 19801 user reviews

Excellent!

AdGuard for Safari

Our ad blocker for Safari has successfully risen to the challenge of Apple forcing everyone to use its new SDK. This AdGuard extension aims to bring back high-quality ad blocking to Safari

AdGuard for Safari v1.11

19,801 19801 user reviews

Excellent!

AdGuard for Android TV

AdGuard for Android TV is the only app that blocks ads, guards your privacy, and acts as a firewall for your Smart TV. Get warnings about web threats, use secure DNS, and benefit from encrypted traffic. Relax and dive into your favorite shows with top-notch security and zero ads!

AdGuard for Android TV v4.12, 14-day trial period

19,801 19801 user reviews

Excellent!

AdGuard for Linux

AdGuard for Linux is the world’s first system-wide Linux ad blocker. Block ads and trackers at the device level, select from pre-installed filters, or add your own — all through the command-line interface

AdGuard for Linux v1.1

19,801 19801 user reviews

Excellent!

AdGuard Temp Mail

A free temporary email address generator that keeps you anonymous and protects your privacy. No spam in your main inbox!

19,801 19801 user reviews

Excellent!

AdGuard VPN

83 locations worldwide

Access to any content

Strong encryption

No-logging policy

Fastest connection

24/7 support

19,801 19801 user reviews

Excellent!

AdGuard DNS

AdGuard DNS is a foolproof way to block Internet ads that does not require installing any applications. It is easy to use, absolutely free, easily set up on any device, and provides you with minimal necessary functions to block ads, counters, malicious websites, and adult content.

19,801 19801 user reviews

Excellent!

AdGuard Mail

Protect your identity, avoid spam, and keep your inbox secure with our aliases and temporary email addresses. Enjoy our free email forwarding service and apps for all operating systems

Use web version

Microsoft Store

App Store

Google Play

19,801 19801 user reviews

Excellent!

AdGuard Wallet

A secure and private crypto wallet that gives you full control over your assets. Manage multiple wallets and discover thousands of cryptocurrencies to store, send, and swap

Ad blocking

AdGuard Ad Blocker wipes out annoying banners, pop-ups, and video ads
Privacy protection

AdGuard Ad Blocker shields your data from web analytics and online trackers
Browsing security

AdGuard Ad Blocker protects against phishing and malicious sites
Parental control

AdGuard Ad Blocker shields children from inappropriate and adult content

Total app rating 4.7/5

More than 19,000 app reviews! We love our users and they love us back

19,801 19801 user reviews

Excellent!

X X X X X Best ads blocker of all time.

EnchantedBelle200 I love this app so much! 💕

Is there any chance you could make it compatible with Tailscale? I use IOS for both apps, and right now I have to turn either AdGuard or Tailscale off to use the other.

HardyDimension_com Add to Chrome and forget...easy, simple and works well!
No need keep updating any filter lists manually.
Appreciate your work🙏💖

Amir Shahnazari Very nice day for example

Krish Ale This app is really good to block ads in some annoying games I don't think there are other ap like this one where u can block ads in games every thing is great u just have to download one more apk after installing this app may be some people might no1

S8ul Mortal just love that every single ad is blocked in every website and no need to buy yt premium cause it block ad on youtube also

Blocks ads on websites

Removes popups, banners, text ads, and video ads

Full-fledged AdGuard app

Yes

Common ad-blocking extension

Yes

Hides empty spaces after ads

Keeps pages looking good after removing ads

Full-fledged AdGuard app

Yes

Common ad-blocking extension

Partly

Prevents tracking

Doesn’t let websites and companies collect your personal data and use it against you

Full-fledged AdGuard app

Yes

Common ad-blocking extension

Partly

Speeds up page loading

Blocks ads and trackers even before the page loads

Full-fledged AdGuard app

Yes

Common ad-blocking extension

Partly

Works in browsers and apps

Eliminates ads, trackers, and annoyances in all browsers and apps on your device

Full-fledged AdGuard app

Yes

Common ad-blocking extension

Offers in-app customer support

Lets you contact our helpful support team directly from the app

Full-fledged AdGuard app

Yes

Common ad-blocking extension

An ad blocker is a program designed to make the Web cleaner and safer and protect your privacy. AdGuard blocks pop-up ads, banners, and video ads — even on YouTube. It removes cookies and tracking requests. It knows what websites are dangerous and ensures you don’t visit any of them.
Most ad blockers are browser extensions that can’t remove all types of ads. If you’re using more than one browser, you’ll need to install an ad-blocking extension for each of them. And if you want to block ads in apps, you just won’t be able to.

AdGuard offers apps for Android, iOS, Windows, and Mac. With them, you can block ads in browsers and apps, prevent websites and companies from tracking you, and protect yourself from phishing and malware. AdGuard also speeds up page loading, allows you to manage DNS servers and web requests, and has in-app support. You can learn more from our comparison table.
We have apps for all popular platforms. AdGuard for Windows, Mac, and Android can be downloaded directly from this page. AdGuard for iOS is available on the App Store. Installation shouldn't be a problem, but you can always check the instructions in our Knowledge base.
Our full-fledged apps for Windows, Mac, and Android offer you a free trial — that’s how you can discover all the features AdGuard has to offer.

Our apps for Android and iOS also have free versions. They can be helpful as well: the free version of AdGuard for Android can block ads in browsers, and the free version of AdGuard for iOS blocks ads and trackers in Safari. But their functionality is limited: to block ads in apps, control DNS requests, protect yourself from malicious domains, and more, you’ll need a full version.

AdGuard also has completely free browser extensions. To learn more about the difference between the AdGuard extensions and full-fledged apps, check out our comparison table.
Sure! AdGuard supports all popular platforms: Android, iOS, Windows, and Mac. The best way to use AdGuard on multiple devices is to buy a license, download the AdGuard app for the needed platform, and log in to it with your license key or AdGuard account credentials.
You don’t necessarily have to buy a license to use AdGuard. But here are some ideas about how it can make your life better:

A license gives you access to advanced features of AdGuard for Android or iOS: ad blocking in apps, DNS protection, firewall, statistics, app management, and others. It also allows you to use AdGuard for Windows and Mac.

With a license, you can use AdGuard on multiple devices and thus protect your family and friends.

If you like AdGuard, that’s how you can support us.

Sure! You can buy a license on a special page and enter the recipient's email — we'll send them a license with a nice gift card. Discounts are applied to gift licenses, too.
We’ve been developing privacy-oriented products since 2009 and have more than 160 million users worldwide. We never share your personal information with anyone and only collect strictly necessary data to run our websites and apps. You can read more in our Privacy policy.
If you want to know more about how exactly AdGuard products work, what filters are, how to create your own filtering rules, and more, check out our Knowledge base. For industry news, AdGuard releases, and promos, you can visit our blog. And if you’d like, you can watch our explanatory videos on AdGuard’s YouTube channel or follow us on social media.
You can share AdGuard with your friends. Whether you buy more licenses and connect your loved ones to AdGuard, buy a license as a gift, share our posts on social networks, or just advise our products to someone you care about — we’re always glad to show more people how beautiful the safe and ad-free Web is.

You can rate us in app stores and on our website. That’s how we know we’re on the right track.

You can also become our contributor: maybe you’re good at translating, know how to improve our filters or the Knowledge base, or want to become a beta tester? We are grateful to our contributors and reward them in return — with AdGuard licenses and gifts.
For any questions, you can always contact us at support@adguard.com.

Make your favorite browser ad-free!

Block ads in Chrome with AdGuard

Block ads in Mozilla Firefox with AdGuard

Block ads in Safari with AdGuard

Block ads in Edge with AdGuard

Block ads in Opera with AdGuard

Block ads in Yandex Browser with AdGuard

Why it is worth installing AdGuard for Chrome

Remove pop-up ads, banners, and video ads

Protect your personal data from web trackers

Get alerted about malicious and dangerous websites

Speed up page loading by removing unnecessary elements

Why it is worth installing AdGuard for Firefox

Block all kinds of ads before they’re loaded: annoying banners, popups, and video ads — even on YouTube!

Protect your personal data from online counters and trackers

Block phishing and malicious websites

Speed up page loading by removing unnecessary elements

Why it is worth installing AdGuard for Safari

Remove all kinds of ads: banners, text ads, flash animation, pre-rolls, and popups

Never let anyone track your online activity

Protect yourself from phishing or fraud — get notified about dangerous websites

Reduce page loading time by removing all unnecessary elements

Why it is worth installing AdGuard for Edge

Block banners, text ads, popups, and video ads

Block online counters and tracking mechanisms

Rest assured that you won’t visit pages that may harm your computer or attempt to trick you

Reduce bandwidth usage and boost your web browsing speed

Why it is worth installing AdGuard for Opera

Block all ads in Opera, including popups, banners, videos, and animated ads

Protect your personal data by blocking all known tracking systems

Block spyware and adware installers

Speed up page loading and save bandwidth by blocking ads

Why it is worth installing AdGuard for Yandex Browser

Remove banners, popups, and irritating video preloads on YouTube

Keep your personal data intact by blocking all known counters and analytics

Protect yourself from malicious, phishing, and fraudulent websites

Load web pages faster by blocking ads

Latest news

Beyond Filter Lists: Rethinking Ad Blocking with LLMs

Nov 18, 2025

AdGuard developer explores different methods of employing LLMs to block ads automatically, without filter lists, and presents a working prototype
Affiliate special: Join the Black Friday Challenge & earn more

Nov 18, 2025

Promote AdGuard this shopping season and earn great rewards.
Behind the complaints: Our investigation into the suspicious pressure on Archive.today

Nov 13, 2025

Some time ago, we were contacted by a group fighting against online CSAM, demanding that AdGuard DNS blocks the Archive.today website. This was only the beginning of a much larger story…
AdGuard for Windows October incident report: Post Mortem

Nov 13, 2025

After releasing version 7.22, we found it caused occasional page loading issues in browsers. Here’s what happened and how we fixed it.

AdGuard review

AdGuard is a robust, widely compatible ad blocker. We recommend it to anyone seeking a good ad-blocking tool.

Learn more

Hacked websites could be using your computer to mine cryptocurrency

According to a recent report from AdGuard, more than 200 of the top 100,000 sites on the web were hosting suspicious code. That may not seem like a big deal, but even sites near the bottom of that list draw a huge amount of traffic. The most popular one on AdGuard's list regularly pulls in around 60 million visits every month.

In total, AdGuard discovered cryptocurrency mining code on 220 sites over a three-week period. During that time around 500 million users unknowingly ran that code on their computers.

Learn more

Bitcoin mining on track to consume all of the world’s energy by 2020

More than half a billion people may be inadvertently mining cryptocurrencies from their computers, smartphones and other devices, according to research conducted earlier this year by ad blocking firm AdGuard.

“How much money have these websites made? We estimate their joint profit at over $43,000,” the AdGuard researchers said in an October blogpost that detailed their discovery. At the time, one bitcoin was worth around $5,000.

Learn more

Billions of video site visitors unwittingly mine cryptocurrency as they watch

The video sites Openload, Streamango, Rapidvideo and OnlineVideoConverter are allegedly loading mining software on to visitors’ computers, making them generate tokens for the bitcoin-like cryptocurrency Monero, according to security firm Adguard.

“We came across several very popular websites that secretly use the resources of users’ devices for cryptocurrency mining,” said Andrey Meshkov, co-founder of Adguard. “According to SimilarWeb, these four sites register 992m visits monthly.”

Learn more

Why hackers love cryptocurrency miner coinhive

Although the developers aren't saying how much money they've made from their idea, online ad-blocking service AdGuard also found the Coinhive miner on over 30,000 sites and estimates the code generates $150,000 in Monero every month. For Coinhive, which takes a 30 percent cut, that amounts to $540,000 per year.

Learn more

You could be secretly mining bitcoins without even knowing it

Popular video sites including Openload, Streamango, Rapidvideo and OnlineVideoConverter are also allegedly loading mining software on to visitors' computers, according to security firm Adguard.

"We came across several very popular websites that secretly use the resources of users’ devices for cryptocurrency mining," said Andrey Meshkov, co-founder of Adguard. "According to SimilarWeb, these four sites register 992m visits monthly."

Learn more

4 ad blockers that still work with Chrome

AdGuard will flat-out refuse to connect to websites known to be malicious for phishing attacks or spreading malware, and it’s good at collapsing the elements of the page that normally display ads, making formatting much less cluttered.

Learn more

Other AdGuard products

Give a boost to your privacy protection: block ads and trackers, stay anonymous, control your web traffic, or declutter your inbox with AdGuard products

AdGuard VPN

Makes you anonymous and your traffic inconspicuous

AdGuard DNS

Helps control web traffic on all your devices

AdGuard Mail

Hides your email address

AdGuard Блог Вредоносные блокировщики 2: теперь с печеньками

Вредоносные блокировщики 2: теперь с печеньками

16 сентября 2019 г. время чтения: 8 мин

— Окей, Гугл, я пользуюсь Chrome и мне нужен блокировщик рекламы.
— Не вопрос, в Chrome Web Store, найдется пара сотен блокировщиков на любой вкус!
— Пара сотен? И они все рабочие? И безопасные? В прошлом году говорили, что в Гугл Сторе обнаружили много фейковых и вредоносных программ!
— Не волнуйтесь, мы как раз собираемся ограничить функции блокировщиков, это поможет!
— Правда? Отлично, спасибо! Выберу блокировщик из первой десятки в выдаче. Вот этот "AdBlock" от "AdBlock, Inc" кажется, заслуживает доверия. У него есть политика конфиденциальности, больше 800 000 пользователей, а компания-разработчик из Германии. Или попробовать вот этот "uBlock" от "Charlie Lee"? Рейтинг 5 звезд, 850 000 пользователей, тоже должен быть ничего.

Так, стоп!

Этот "AdBlock" — вредоносная программа, мимикрировавшая под блокировщик, как и якобы "uBlock". В сторе вообще висят тонны менее популярных клонов известных программ. Откуда мне это известно? Я потратил довольно много времени, копаясь в их коде, пытаясь выяснить, что они делают на самом деле. Другой вопрос — как вы (и вообще любой простой пользователь) можете об этом знать?

Cверху — реальный AdBlock, ниже — его вредоносные клоны

И что же с ними не так?

Для начала, эти программы используют названия двух весьма популярных блокировщиков рекламы, что, по сути, является обманом пользователей — уже одного этого факта достаточно для подозрений. Тем не менее, несмотря на множество репортов, расширения так и продолжают "висеть" в сторе.

Похоже, проблемы профессиональной этики и прямой обман — это ещё не причина удалять расширение. Попробуем зайти с другой стороны и рассмотрим их вредоносное поведение.

Сейчас будет длинное техническое объяснение. Если вы не разработчик, советую сразу перейти к следующей части статьи.

Поначалу расширения делают то, что им и положено делать — блокируют рекламу. Они оба используют код оригинального расширения "AdBlock", так что качество блокировки приличное.

Периодически они высылают такие запросы:

GET https://ublockerext.com/heartbeat/json/?action=config&&id=dgpfeomibahlpbobpnjpcobpechebadh&version=1.7&lt=199&uid=76f24bff-d831-aa47-7377-7ea195bf9cf8&r=1567540438520

На первый взгляд в ответе сервера нет ничего криминального:

{"blockPopups":true,"statuses":[["synchronize_invalid_url","filters_subscription_lastDownload_invalidURL"],["synchronize_connection_error","filters_subscription_lastDownload_connectionError"],["synchronize_invalid_data","filters_subscription_lastDownload_invalidData"],["synchronize_checksum_mismatch","filters_subscription_lastDownload_checksumMismatch"]]}

Но примерно через 55 часов после установки ответ сервера внезапно меняется и выглядит уже довольно подозрительно.

В этом новом ответе содержится список команд, который должно выполнить расширение. Затем меняется его поведение, и кроме собственно блокирования рекламы расширение начинает делать кое-что ещё.

При заходе на каждый новый домен отсылается запрос на urldata.net. Если вы зайдете, например, на teamviewer.com, высланный запрос будет выглядеть так:

http://urldata.net/api?key=4e4a7faf91b2bcda88a60e269e4d6208bfe8d3d6&out=https%3A%2F%2Fteamviewer.com&format=txt

Ответ на такой запрос будет содержать следующий URL:

http://urldata.net/newapi/click/PvdHh16uGq6mLqmbUoT3AaUImj7ynsh0cVlCywkljEF19oBV0JH4jNYpn--xwIyEV36OMPPH1IrESEyclc7yxEbB3mYrfPMxnGqoV4SOmQ4MI9NYNHAQrPHwvJNE0W488ESUN1y7ONahVxwBZKnr4PZlZKI5gNi65DoIfYNwXAPoyFwh8Mgz1bX63V4PnjspvZa-DqjF5GTNxoIJqpHLC1_SwlFRYeoIvVGutkgfCSI4hMHa3z52VbL7VxbaQAhhqLC-uJUJO_s234VL3JDM01O-JE9PS6fXOH6z5XUojvotSQ5mZe7NFEsuMaeSK9rasy8MvaICWZpGDmgxIodzvMpJUv41ppkuqMBDDYpHptCEBb4Za_HffgaiKn-aY_COfan5P650B6ZTQsVqNKidMRRaHY4FxvM7VA79vX5_Oe0J0c9Wczw8VM9GrvzlGLdt4TjyBcF2JEtpcayh99JdL1wxrL_EoEHMml4LDy1JwT8LPxPG2vrlK5QSuoGrx-7tJLHD6Gq3SUeQj1XXEcENy77hkzU79TO9_hEs29Kq6ASdk6NKIZT8gOuJsNOAkU4i0Y9JvmEpdENyBL2ugmFNyitW2CfGzHrLsNex

Расширение тут же откроет эту ссылку в фоновом режиме. За этим запросом последует цепочка редиректов:

Последним запросом в цепочке будет вот этот:

https://www.teamviewer.com/en/content/2019-cj-emea/?coupon=aff-19-en-10-1&utm_source=affiliate&utm_medium=cj&utm_campaign=dedc1dc5d58611e982c203670a180513&utm_content=2933854&PID=affiliate.cj.q1&s=1&cjevent=dedc1dc5d58611e982c203670a180513

Вы спросите, что происходит? Судя по всему, адрес принадлежит чьей-то партнёрской программе с Teamviewer. В ответ ваш браузер получит "партнёрский" куки. С этого момента если вы сделаете покупку на сайте teamviewer.com, разработчик расширения получит комиссию от Teamviewer.

Эту технику обмана называют Cookie stuffing или cookie dropping (подмена куки).

Для этой схемы используется множество партнёрских ссылок. Здесь лишь малая часть, того, что мне удалось "вытащить" за 30 минут. Вот некоторые жертвы обмана, чьи названия на слуху: microsoft.com, linkedin.com, aliexpress.com, booking.com, и это далеко не все, список гораздо длиннее.

Ещё один интересный факт об этом расширении — у него есть механизмы самозащиты. Например, оно может "увидеть", что открыта консоль разработчика и тут же прекратить любую подозрительную активность.

О ситуации вкратце

Обе фейковые программы — AdBlock и uBlock — вводят пользователей в заблуждение, прикрываясь названиями действующих и популярных блокировщиков.
Их до сих пор не убрали из Google Store, несмотря на многочисленные репорты.
Настоящая цель этих расширений — Cookie stuffing — это нелегальная схема обогащения.
Масштаб поражает. У этих расширений на двоих более 1,6 миллиона "активных пользователей", подменённых куки с 300 (минимум!) сайтов из списка Топ 10000 рейтинга Alexa. Сложно рассчитать точный ущерб, но мы говорим примерно о миллионах долларов США в месяц.

В целом, есть и положительная сторона. Поскольку схема раскрыта, хозяева партнёрских программ могут отследить денежные потоки и выяснить, кто за ними стоит. За cookie stuffing можно получить вполне реальный срок, так что есть шанс, что разработчиков этих расширений привлекут к ответственности.

Проблема фейковых расширений

Проблема на самом деле не нова, мы уже писали о подобных случаях. Но, несмотря на огласку, я не вижу никаких шагов от Google в сторону решения проблемы. Ощущение, что наоборот, стало хуже. По крайней мере, раньше фейковые блокировщики должны были придумывать оригинальные названия. Теперь, как мы видим, они даже не заморачиваются!

И на такие уловки попадаются не только пользователи. Например, фейковый "AdBlock" попал в список блокировщиков, рекомендуемых androidcentral.com:

Отрывок с положительным отзывом от Android Central

Только ли с Chrome WebStore есть такая проблема? Не совсем. Например, сплагиаченный фейк AdGuard получил значок "рекомендуемая программа" от магазина расширений Mozilla Add-ons, несмотря на многочисленные жалобы о неэтичном поведении (1, 2). Спасибо хоть на том, что не украли название, ограничившись лишь частью кода.

Что можно сделать?

Вы, вероятно, слышали, что Google предложил решение под названием "Manifest V3". Они говорят, что ограничение возможностей расширений улучшит их производительность, повысит уровень безопасности и защиту конфиденциальности.

Думаете, так и будет? В целом, я согласен с пунктом про производительность, но я не вижу, как эти меры помогут с остальным. Например, эта мера никак не помешает двум уже упомянутым расширениям заниматься куки стаффингом.

И вообще я совершенно согласен с тем, что предлагает EFF:

Для того, чтобы действительно защитить пользователей, Google нужно начать должным образом применять существующую политику Chrome Web Store.

Тем временем в офисе Google

Как можно защитить себя?

Как видите, даже журналисты порой дают фейкам себя обмануть, так что вопрос действительно сложный. Год назад я бы сказал, что рецепт прост — устанавливайте расширения только от разработчиков, которым доверяете.

Сейчас ситуация стала хуже, чем была, и поэтому хотелось бы добавить вот какие рекомендации (по крайней мере пока что-нибудь не изменится):

Если вы собираетесь установить расширение для браузера, подумайте. Может, оно вам на самом деле не очень-то и нужно?
Не верьте на слово описаниям расширений в сторе. Имейте в виду, что они практически не проходят никакие проверки, так что написать могут всё, что угодно.
Чтение отзывов пользователей тоже может оказаться бесполезным занятием. У упомянутых расширений были отличные отзывы, но расширения оказались вредоносными.
Не пользуйтесь внутренним поиском Веб сторов, лучше загружайте расширения напрямую с официальных сайтов разработчиков.

Обновлено 18 сентября:
Мы рады добавить, что оба расширения, о которых шла речь в этой статье, на данный момент заблокированы в Chrome. Это, конечно, хорошо, но Google придётся сделать намного больше, чтобы доказать, что они действительно заботятся о безопасности своих пользователей.

Обновлено 3 июня 2022 г. время чтения: 8 мин AdGuard Research Industry news

Andrey Meshkov

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