Credential ZIP Lures Use Malicious LNKs to Deploy DLLs
📎 BlackPoint researchers tracked a campaign that distributes credential-themed ZIP archives containing malicious Windows shortcut (.lnk) files. When opened, the shortcuts launch minimized, obfuscated PowerShell that downloads DLL payloads disguised as .ppt files, saves them to the user profile and invokes them via rundll32.exe. The dropper assembles commands from byte arrays, probes for antivirus processes and uses quiet flags to minimize visible indicators. Recommended mitigations include blocking LNKs in archives, enforcing Mark of the Web, denying execution from user-writable locations, and enabling PowerShell script block logging and AMSI.
