SCObfuscatorSuperCRacker

Hunt Hypothesis

This rule detects the presence of the SCObfuscatorSuperCRacker YARA signature, indicating potential use of obfuscated scripts or payloads designed to evade standard static analysis. Proactively hunting for this indicator in Azure Sentinel allows the SOC to identify stealthy post-exploitation activities or data exfiltration attempts that may have bypassed initial perimeter defenses.

YARA Rule

rule SCObfuscatorSuperCRacker
{
      meta:
		author="malware-lu"
strings:
		$a0 = { 60 33 C9 8B 1D 00 [3] 03 1D 08 [3] 8A 04 19 84 C0 74 09 3C ?? 74 05 34 ?? 88 04 19 41 3B 0D 04 [3] 75 E7 A1 08 [3] 01 05 0C [3] 61 FF 25 0C }

condition:
		$a0
}

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

• Legitimate Script Obfuscation by DevOps Teams: Developers or DevOps engineers may use tools like PyObfuscator (for Python) or JavaScript Obfuscator to protect proprietary logic in CI/CD pipelines or internal microservices. These tools often employ string encryption and control flow flattening that can mimic the structural patterns targeted by the SCObfuscatorSuperCRacker rule.

  • Filter/Exclusion: Exclude processes where the parent process is a known build tool (e.g., msbuild.exe, gradle, npm, python.exe running a specific script path) or where the file path resides in standard development directories (e.g., C:\Projects\, C:\Users\<user>\workspace\).

• Commercial Endpoint Protection or DLP Agents: Enterprise DLP (Data Loss Prevention) or EDR (Endpoint Detection and Response) agents (such as Zscaler, Symantec DLP, or CrowdStrike Falcon) frequently use obfuscated code modules to prevent tampering and hide their internal logic from malware. These modules often reside in system directories and are signed by well-known vendors.

  • Filter/Exclusion: Exclude files with valid digital signatures from trusted vendors (e.g., Zscaler, Inc., Symantec Corp, CrowdStrike, Inc.) and paths under C:\Program Files\ or C:\ProgramData\ associated with these specific vendor names.

• Scheduled Maintenance Jobs with Obfuscated PowerShell: IT administrators often create scheduled tasks for disk cleanup, log rotation, or backup verification using PowerShell scripts that are obfuscated to hide sensitive credentials or complex logic. These scripts may be stored in C:\Windows\System32\Tasks\ or executed via powershell.exe with -EncodedCommand or -File arguments pointing to obfuscated .ps1 files