Researchers have uncovered 17 additional malicious browser extensions tied to the ongoing GhostPoster campaign, which collectively amassed approximately 840,000 installs across the Chrome, Firefox, and Microsoft Edge extension stores. First reported in December by Koi Security, the campaign involves extensions that secretly embed malicious JavaScript code within image files, allowing them to evade detection while monitoring user activity and maintaining backdoor access. The hidden code retrieves an obfuscated payload from external servers that tracks browsing behavior, manipulates affiliate links on popular e-commerce sites, and injects invisible iframes to carry out advertising and click-fraud activities. Despite earlier exposure, a new analysis by LayerX confirms the operation continued, expanding from Microsoft Edge to Firefox and Chrome. Some of the malicious extensions had been available since 2020, highlighting the campaign’s long-term persistence. LayerX also identified a more advanced variant within the Instagram Downloader extension. In this version, malicious logic was moved into the extension’s background script, with payloads concealed inside bundled image files instead of simple icons. At runtime, the script extracts hidden data using a delimiter, decodes it, and executes it as JavaScript, increasing stealth and resistance to detection. The affected extensions have since been removed from Mozilla’s and Microsoft’s add-on stores, and Google has confirmed their removal from the Chrome Web Store. However, users who previously installed these extensions may still be at risk and are advised to remove them immediately and review browser activity for signs of compromise.
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