Tuesday, March 5, 2024

Droidclub Botnet via Malicious Chrome Extensions That Affect More Than Half a Million Users

Security researchers from Trend Micro detected a new botnet dubbed Droidclub distributed through malicious chrome extensions. Attackers used malvertising and social engineering methods to display fake messages that trick’s users into installing the malicious extensions.

More than 423,992 users have been affected with the bot and a total of 89 extensions removed from chrome web store. With Its persistence nature, it makes more difficult for users in Uninstalling or reporting the extension.

Droidclub Execution Flow

It injects ads and cryptocurrency mining scripts to every page the user visiting and it can also modify the contents of the websites, ads by matching the IFRAME sizes.

“Droidclub also abuses legitimate session replay libraries to violate the user’s privacy. These libraries are meant to be used to replay a user’s visit to a website, so that the site owner can see what the user saw, and what he entered into the machine, among other things”, researchers said.

Botnet distributed via malvertising and social engineering methods, if the extension installed it checks with C&C server and installs additional configuration codes.

The infected browser pops up and displays ads periodically, and the frequency of displaying ads controlled by C&C server. Trend Micro published a technical analysis report on Botner behavior.

Also Read Four Chrome Extensions Impacted More than Half a Million Users

It also capable of injecting Javascript library from Yandex Metrica of pages visited by users and modifies certain external links based on the keywords. The malicious extensions reported to Google by Trend Micro and they are disabled now.

“The combination of the extension and the library can steal data entered into forms such as names, credit card numbers, CVV numbers, email addresses, and phone numbers. The library does not capture passwords by design, so these are not stolen by the threat actors”, researchers said.

Botnet Nature and Mitigation – Malicious Chrome Extensions

It is difficult to remove and report the malicious chrome extensions. It blocks the users in reporting the extension by checkings the URL and redirects to extension page.

If users try to uninstall the malicious chrome extensions chrome://extensions/ it redirects to a fake page to believe it is removed, but it remains in the system.

By using Ad blockers and script blockers that can block malicious sites from displaying ads. System administrators can define chrome policies to avoid installing these extensions.


Latest articles

US Court Orders NSO Group to Handover Code for Spyware, Pegasus to WhatsApp

Meta, the company that owns WhatsApp, filed a lawsuit against NSO Group in 2019....

New SSO-Based Phishing Attack Trick Users into Sharing Login Credentials  

Threat actors employ phishing scams to trick individuals into giving away important details like...

U.S. Charged Iranian Hacker, Rewards up to $10 Million

The United States Department of Justice (DoJ) has charged an Iranian national, Alireza Shafie...

Huge Surge in Ransomware-as-a-Service Attacks targeting Middle East & Africa

The Middle East and Africa (MEA) region has witnessed a surge in ransomware-as-a-service (RaaS)...

New Silver SAML Attack Let Attackers Forge Any SAML Response To Entra ID

SolarWinds cyberattack was one of the largest attacks of the century in which attackers...

AI Worm Developed by Researchers Spreads Automatically Between AI Agents

Researchers have developed what they claim to be one of the first generative AI...

20 Million+ Cutout.Pro User Records Leaked On Hacking Forums

CutOut.Pro, an AI-powered photo and video editing platform, has reportedly suffered a data breach,...
Guru baran
Guru baranhttps://gbhackers.com
Gurubaran is a co-founder of Cyber Security News and GBHackers On Security. He has 10+ years of experience as a Security Consultant, Editor, and Analyst in cybersecurity, technology, and communications.

Live Account Takeover Attack Simulation

Live Account Take Over Attack

Live Webinar on How do hackers bypass 2FA ,Detecting ATO attacks, A demo of credential stuffing, brute force and session jacking-based ATO attacks, Identifying attacks with behaviour-based analysis and Building custom protection for applications and APIs.

Related Articles