220921a4.7z Apr 2026

Initial access for ransomware deployment or data exfiltration. .7z (used to evade automated sandbox detection). Security Recommendations

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. 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 220921A4.7z

If this file was found on a production system, isolate the host immediately to prevent lateral movement.

The recipient is provided a password (often "1234") to extract the archive.