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Showing posts with label Polymorphic Attack. Show all posts
Polymorphic Attack
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Malicious Chrome Extensions Spoof Password Managers in Novel Polymorphic Attack

 

Cybersecurity experts have uncovered a novel technique for a malicious web browser extension to spoof any installed add-on.

"The polymorphic extensions create a pixel perfect replica of the target's icon, HTML popup, workflows and even temporarily disables the legitimate extension, making it extremely convincing for victims to believe that they are providing credentials to the real extension," SquareX noted in a report published earlier this month. 

The attack targets all Chromium-based web browsers, including Google Chrome, Microsoft Edge, Brave, Opera, and others. The strategy relies on the fact that users frequently pin extensions to the browser's toolbar. In a hypothetical attack scenario, threat actors could publish a polymorphic extension to the Chrome Web Store (or any extension marketplace) and pass it off as a utility. 

The attackers could then use the harvested credentials to take over online accounts and steal sensitive financial and personal data without authorisation. While the add-on provides the claimed functionality without raising any suspicions, it activates the malicious features in the background by actively scanning for the presence of online resources associated with particular target extensions using a technique known as web resource hitting. 

Once a suitable target extension has been located, the attack proceeds to the next stage, when it morphs into a duplicate of the legitimate extension. This is performed by modifying the rogue extension's icon to match that of the target and temporarily disabling the actual add-on using the "chrome.management" API, resulting in its removal from the toolbar. 

"The polymorphic extension attack is extremely powerful as it exploits the human tendency to rely on visual cues as a confirmation," SquareX added. "In this case, the extension icons on a pinned bar are used to inform users of the tools they are interacting with.” 

The findings follow a month after the company revealed Browser Syncjacking, another attack technique that allows a seemingly harmless browser extension to take over a victim's device.
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Polymorphic Attack
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New Polymorphic Attack Enables Malicious Chrome Extensions to Impersonate Password Managers and Banking Apps

Researchers at SquareX Labs have uncovered a sophisticated “polymorphic” attack targeting Google Chrome extensions, allowing malicious extensions to seamlessly morph into trusted ones, such as password managers, cryptocurrency wallets, and banking apps. The attack exploits Chrome’s ‘chrome.management’ API to gain insights into the user’s installed extensions and then impersonates them to steal sensitive information. 

The attack begins when an unsuspecting user installs a seemingly legitimate extension—such as an AI-powered marketing tool—through the Chrome Web Store. Once installed, the extension gains access to the list of other installed extensions using the ‘chrome.management’ API. If this permission is not granted, attackers can use a stealthier approach, injecting malicious code into web pages to detect installed extensions based on unique resource requests. 

This information is then sent to an attacker-controlled server, which determines whether a targeted extension is present. If a high-value target, such as a password manager, is detected, the malicious extension initiates the impersonation process. SquareX demonstrated how attackers could disable a legitimate extension, like 1Password, using the ‘chrome.management’ API or by manipulating the user interface to hide it. Simultaneously, the malicious extension changes its name, icon, and behavior to mimic the real one. 
To lure victims into entering their credentials, attackers deploy deceptive tactics, such as displaying fake session expiration messages that prompt users to log back in via a phishing form.

The stolen credentials are then sent to the attackers, after which the malicious extension reverts to its original state and re-enables the genuine extension, making detection nearly impossible. 

SquareX Labs has responsibly disclosed the vulnerability to Google, warning that it remains exploitable even in the latest Chrome version. The researchers recommend that Google strengthen security measures by restricting abrupt extension modifications, such as icon or HTML changes, or at the very least, issuing user alerts when such modifications occur. They also criticize Google’s classification of the ‘chrome.management’ API as a “medium risk,” given its extensive use in widely trusted extensions, including ad blockers and password managers. 

As of now, Google has not implemented any direct countermeasures against this attack. BleepingComputer has reached out to the company for a statement and will update its report accordingly. Meanwhile, users are advised to exercise caution when installing Chrome extensions and to be wary of unusual login prompts that could be phishing attempts.
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