SpecialEXEPaswordProtectorv101EngPavolCerven

Hunt Hypothesis

This rule identifies the presence of the Password Protector v1.0.1 executable, a utility often used by adversaries to encrypt files or protect payloads with a password to hinder forensic analysis. Proactively hunting for this specific artifact in Azure Sentinel allows the SOC to detect potential ransomware staging or data exfiltration preparation activities before they progress to full encryption or deployment.

YARA Rule

rule SpecialEXEPaswordProtectorv101EngPavolCerven
{
      meta:
		author="malware-lu"
strings:
		$a0 = { 60 E8 00 00 00 00 5D 81 ED 06 00 00 00 89 AD 8C 01 00 00 8B C5 2B 85 FE 75 00 00 89 85 3E 77 00 00 8D 95 C6 77 00 00 8D 8D FF 77 00 00 55 68 00 20 00 00 51 52 6A 00 FF 95 04 7A 00 00 5D 6A 00 FF 95 FC 79 00 00 8D 8D 60 78 00 00 8D 95 85 01 00 00 55 68 00 }

condition:
		$a0 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: A developer or IT administrator manually runs the SpecialEXE utility (a known password protection/encryption tool) from a command prompt or PowerShell session to encrypt a sensitive configuration file or backup archive before moving it to a secure storage location.

  • Filter/Exclusion: Exclude execution events where the parent process is cmd.exe, powershell.exe, or pwsh.exe and the command line arguments contain keywords like encrypt, protect, or -p (password flag), provided the user is in the IT-Admins or DevOps AD group.

• Scenario: A scheduled maintenance job (e.g., via Task Scheduler or cron) runs a batch script that invokes SpecialEXE to automatically protect daily log files or database dumps before archiving them to the NAS.

  • Filter/Exclusion: Exclude executions where the parent process is svchost.exe (Task Scheduler service) or bash.exe/sh.exe (Linux/WSL) and the working directory is a known archive path (e.g., \\fileserver\archive\ or /var/backups/).

• Scenario: A CI/CD pipeline or build agent (e.g., Jenkins, Azure DevOps, or GitHub Actions runner) executes SpecialEXE as part of a post-build step to encrypt artifacts or secrets before publishing them to a registry.

  • Filter/Exclusion: Exclude executions where the hostname matches the CI/CD agent naming convention (e.g., *jenkins*, *build-agent*, *ci-runner*) or the parent process is the build tool’s executable (e.g., java.exe, node.exe, dotnet.exe).

• Scenario: An application installer or setup wizard (e.g., for a proprietary ERP or CRM system) bundles `