A newly identified cyberattack campaign is targeting Windows users through fake CAPTCHA verification pages hosted on compromised websites. The attack combines multiple evasion techniques, including compromised WordPress sites, blockchain based payload delivery, social engineering, and malware loading, to bypass traditional security controls. Unlike typical phishing campaigns, victims are redirected to legitimate looking websites through search engine results, making the attack more convincing and difficult to detect. The attack activates only when accessed from a desktop Windows system. Hidden malicious code retrieves a payload from a public blockchain network using a technique known as EtherHiding. Victims are then presented with a fake CAPTCHA prompt instructing them to perform keyboard actions that unknowingly execute a malicious command. This command leverages the legitimate Windows utility rundll32.exe to load a remote malicious DLL directly into memory, avoiding file based detection mechanisms and reducing the likelihood of security alerts. Researchers linked the campaign to GULoader, a malware loader commonly used to deliver information stealers and remote access tools. Successful compromise could result in credential theft, system takeover, or additional malware infections. Security teams are advised to monitor for suspicious rundll32.exe activity, block unnecessary outbound SMB traffic, review Windows Run dialog history, and inspect network traffic for connections to blockchain related services. User awareness training and behavioral based endpoint protection can also help reduce the risk of compromise from similar social engineering attacks.
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