MoleBox Pro v261

Hunt Hypothesis

This rule detects the presence of MoleBox Pro, a commercial anti-forensic tool frequently used by adversaries to hide processes, files, and network connections from standard monitoring mechanisms. Proactively hunting for this signature in Azure Sentinel allows the SOC team to identify potential stealth operations early, compensating for the tool’s ability to obscure malicious activity from native endpoint visibility.

YARA Rule

rule MoleBox_Pro_v261: PEiD
{
    strings:
        $a = { E8 00 00 00 00 60 E8 4F 00 00 00 ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? E9 2A 6A 00 00 E9 3E 6A 00 00 E9 39 6A 00 00 E8 6E FB FF FF 7E 04 01 00 ?? 96 00 00 ?? ?? ?? ?? ?? ?? F1 ?? ?? ?? A4 ?? ?? ?? A1 ?? ?? ?? E0 ?? ?? ?? 19 ?? ?? ?? BE ?? ?? ?? 13 }
    condition:
        $a at pe.entry_point

}

Deployment Notes

This YARA rule can be deployed in the following contexts:

• Microsoft Defender for Endpoint — Custom indicators / advanced hunting
• Email Gateway — Attachment scanning
• File Share Monitoring — Periodic scanning of shared drives
• YARA CLI — Manual threat hunting on endpoints

This rule contains 1 string patterns in its detection logic.

• Source Rule

False Positive Guidance

• Scenario: An IT administrator manually launches the MoleBox Pro application from a mapped network drive or USB stick to perform a one-time forensic analysis or data compression task on a server, rather than using the standard installed version.

  • Filter/Exclusion: Exclude alerts where the process path starts with \\ (UNC path) or ends with \MoleBox.exe and the parent process is explorer.exe or cmd.exe initiated by an admin account, specifically if the file hash matches the known legitimate build of v261.

• Scenario: A software development team uses MoleBox Pro as a dependency for a custom build script or CI/CD pipeline that packages application binaries into a single executable, running the tool via a scheduled task or PowerShell script.

  • Filter/Exclusion: Exclude alerts where the parent process is powershell.exe, pwsh.exe, or cmd.exe and the command line arguments contain flags typical for automation (e.g., /c, /p, or specific output paths), and the user account belongs to a DevOps or BuildService group.

• Scenario: A security or data engineering team runs MoleBox Pro in “silent” mode to compress large log files or datasets for off-site backup, often invoked through a batch file or scheduled job on a file server.

  • Filter/Exclusion: Exclude alerts where the process is running on a File Server role, the user account is a service account (e.g., svc_backup), and the command line includes silent/quiet flags (e.g., /s, /q) or points to a known backup directory.

• Scenario: An endpoint protection or application whitelisting policy allows MoleBox Pro to be executed from a specific “Tools” folder on the C: drive, which is used by multiple departments for ad-h