Many GitHub users this week received a novel phishing email warning of critical security holes in their code. Those who clicked the link for details were asked to distinguish themselves from bots by pressing a combination of keyboard keys that causes Microsoft Windows to download password-stealing malware. While it’s unlikely that many programmers fell for this scam, it’s notable because less targeted versions of it are likely to be far more successful against the average Windows user.
A reader named Chris shared an email he received this week that spoofed GitHub’s security team and warned: “Hey there! We have detected a security vulnerability in your repository. Please contact us at https://github-scanner[.]com to get more information on how to fix this issue.”
Visiting that link generates a web page that asks the visitor to “Verify You Are Human” by solving an unusual CAPTCHA.
This malware attack pretends to be a CAPTCHA intended to separate humans from bots.
Clicking the “I’m not a robot” button generates a pop-up message asking the user to take three sequential steps to prove their humanity. Step 1 involves simultaneously pressing the keyboard key with the Windows icon and the letter “R,” which opens a Windows “Run” prompt that will execute any specified program that is already installed on the system.
Executing this series of keypresses prompts the built-in Windows Powershell to download password-stealing malware.
Step 2 asks the user to press the “CTRL” key and the letter “V” at the same time, which pastes malicious code from the site’s virtual clipboard.
Step 3 — pressing the “Enter” key — causes Windows to launch a PowerShell command, and then fetch and execute a malicious file from github-scanner[.]com called “l6e.exe ..
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