SLVc0deProtector11xSLVICU

Hunt Hypothesis

This detection identifies potential code obfuscation or packing activities associated with the SLVc0deProtector signature, which adversaries often employ to evade static analysis and hide malicious logic within legitimate processes. A proactive hunt is essential in Azure Sentinel to uncover stealthy threats that may bypass standard heuristic scans by leveraging this specific YARA rule to analyze process execution patterns across the environment.

YARA Rule

rule SLVc0deProtector11xSLVICU
{
      meta:
		author="malware-lu"
strings:
		$a0 = { E8 00 00 00 00 58 C6 00 EB C6 40 01 08 FF E0 E9 4C [2] 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

Here are 5 specific false positive scenarios for the SLVc0deProtector11xSLVICU detection rule, including suggested filters and exclusions:

• Scenario: Legitimate execution of Symantec Endpoint Protection (SEP) or McAfee ePolicy Orchestrator during scheduled real-time scanning cycles.

  • Context: The YARA rule detects the SLVc0deProtector signature within the memory space of the antivirus engine itself as it scans system directories, triggering a match on its own process (rtscan.exe or mfengine.exe).
  • Filter/Exclusion: Exclude processes where the parent process is the AV service (e.g., Symantec Endpoint Protection Client Service) and the file path resides within the vendor’s installation directory (e.g., C:\Program Files\Symantec\... or C:\ProgramData\McAfee\...).

• Scenario: Deployment of application updates via Microsoft System Center Configuration Manager (SCCM) or Ivanti Neurons.

  • Context: During a scheduled maintenance window, the deployment agent extracts and installs software packages that utilize SLVc0deProtector for code signing verification or integrity checks on the payload.
  • Filter/Exclusion: Filter alerts where the parent process is ccmexec.exe (SCCM) or IvantiAgent.exe, and the event timestamp falls within defined maintenance windows (e.g., 02:00–04:00 UTC).

• Scenario: Execution of internal DevOps CI/CD pipelines using Jenkins or GitLab Runner.

  • Context: Build agents on enterprise servers compile code and run unit tests that invoke the SLVc0deProtector library to validate build artifacts before pushing them to the repository.