220921a4.7z 〈Secure — 2024〉

Historically linked to the TR (Qakbot) distribution infrastructure. Behavioral Pattern:

Part of a coordinated phishing campaign identified around September 21, 2022 . 220921A4.7z

Check for execution of regsvr32.exe or rundll32.exe shortly after the file was downloaded. Once extracted, the user executes the internal file,

Once extracted, the user executes the internal file, which reaches out to a Command & Control (C2) server to download the primary malware payload. Technical Indicators (Estimated) Typical Value Original Date September 21, 2022 Archive Password 1234 or abc123 Primary Goal the user executes the internal file

Reset user credentials and perform a full forensic sweep for secondary payloads (like Cobalt Strike beacons).

The archive typically contained a malicious file—often an ISO image, a Windows Script File ( .wsf ), or a Shortcut file ( .lnk )—designed to execute a DLL (Dynamic Link Library) on the host system.