SLVc0deProtectorv06SLV

Hunt Hypothesis

This hypothesis targets the presence of the SLVc0deProtector v06 malware variant, a known tool often used to protect malicious payloads or establish initial footholds in compromised environments. Proactively hunting for this signature in Azure Sentinel allows the SOC team to identify low-severity infections early, potentially uncovering stealthy persistence mechanisms or precursor activities before they escalate into more impactful adversary actions.

YARA Rule

rule SLVc0deProtectorv06SLV
{
      meta:
		author="malware-lu"
strings:
		$a0 = { E8 49 00 00 00 69 E8 49 00 00 00 95 E8 4F 00 00 00 68 E8 1F 00 00 00 49 E8 E9 FF FF FF 67 E8 1F 00 00 00 93 E8 31 00 00 00 78 E8 DD FF FF FF 38 E8 E3 FF FF FF 66 E8 0D 00 00 00 04 E8 E3 FF FF FF 70 E8 CB FF FF FF 69 E8 DD FF FF FF 58 E8 DD FF FF FF 69 E8 E3 FF FF FF 79 E8 BF FF FF FF 69 83 C4 40 E8 00 00 00 00 5D 81 ED 97 11 40 00 8D B5 EF 11 40 00 B9 FE 2D 00 00 8B FE AC F8 [6] 90 }

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 specific false positive scenarios for the YARA rule SLVc0deProtectorv06SLV (a known signature for the SLVc0deProtector packer/protector), along with suggested filters:

• Scenario: Legacy Application Deployment via SCCM/MECM

  • Context: An IT administrator deploys a legacy line-of-business application (e.g., an old accounting tool or specialized engineering software) that was built using the SLVc0deProtector packer to reduce file size or protect IP. The executable is copied to the C:\Program Files\LegacyApp\ directory on multiple endpoints via a System Center Configuration Manager (SCCM) task sequence.
  • Filter/Exclusion: Exclude files located in C:\Program Files\ or C:\Program Files (x86)\ where the parent folder name matches known legacy application names (e.g., LegacyApp, OldERP, SpecializedTool) and the file hash has been previously whitelisted in the CMDB.

• Scenario: Scheduled Backup Job with Custom Wrapper

  • Context: A DBA creates a custom PowerShell or Batch script wrapper to invoke a specific backup utility. The utility executable itself is packed with SLVc0deProtector to prevent tampering. This job runs daily via Windows Task Scheduler (schtasks) and executes the packed binary from a network share or local admin folder (C:\Admin\Backups\).
  • Filter/Exclusion: Exclude detection if the parent process is Task Scheduler (svchost.exe or taskschd.msi context) or if the file path contains C:\Admin\ or C:\Backup\ and the file extension is .exe with a known good hash associated with the backup tool.

• **Scenario: Development Team