Cyble threat intelligence researchers discovered a GitHub repository posing as a hiring coding challenge, tricking developers into downloading a backdoor that steals private data. The campaign employs a variety of novel approaches, including leveraging a social media profile for command and control (C&C) activities rather than C&C servers. Cyble Research and Intelligence Labs (CRIL) researchers discovered invoice-themed lures, suggesting that the campaign may be moving beyond a fake hiring challenge for developers.
According to a blog post by Cyble researchers,
the campaign appears to target Polish-speaking developers, and the malware exploits geofencing to restrict execution. The researchers believed that the campaign is disseminated through career sites such as LinkedIn or regional development forums.
The fake recruitment test, dubbed “FizzBuzz,” dupes users into downloading an ISO file containing a JavaScript exercise and a malicious LNK shortcut. When executed, the LNK file (“README.lnk”) invokes a PowerShell script that installs a stealthy backdoor known as “FogDoor” by the researchers.
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