SVKProtectorv13xEngPavolCerven

Hunt Hypothesis

This detection identifies the presence of the SVK Protector v13 engine signature, indicating potential activity from a legitimate security tool or a sophisticated adversary leveraging this specific protection mechanism to evade standard scans. A proactive hunt is recommended in Azure Sentinel to distinguish between expected security software behavior and anomalous instances where this signature may be utilized by an attacker for stealthy execution or as part of a supply chain compromise strategy.

YARA Rule

rule SVKProtectorv13xEngPavolCerven
{
      meta:
		author="malware-lu"
strings:
		$a0 = { 60 E8 00 00 00 00 5D 81 ED 06 00 00 00 EB 05 B8 [2] 42 00 64 A0 23 00 00 00 EB 03 C7 84 E8 84 C0 EB 03 C7 84 E9 75 67 B9 49 00 00 00 8D B5 C5 02 00 00 56 80 06 44 46 E2 FA 8B 8D C1 02 00 00 5E 55 51 6A 00 56 FF 95 0C 61 00 00 59 5D 40 85 C0 75 3C 80 3E }

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 4 specific false positive scenarios for the SVKProtectorv13xEngPavolCerven YARA rule, tailored for an enterprise environment:

• Scenario: Automated deployment of the Microsoft Office 2021/365 Click-to-Run update agent.

  • Context: The OfficeClickToRun.exe process frequently generates temporary executable files in %ProgramFiles%\Common Files\Microsoft Shared\ClickToRun that match the SVKProtector signature structure during scheduled patching windows (e.g., Tuesday 2:00 AM).
  • Suggested Filter/Exclusion: Exclude file paths containing C:\Program Files\Common Files\Microsoft Shared\ClickToRun\* and process names matching OfficeClickToRun.exe.

• Scenario: Execution of the CrowdStrike Falcon Sensor self-update mechanism.

  • Context: The CrowdStrike sensor (csfalcon.exe) periodically extracts and executes internal components or plugins that utilize a similar PE header structure to the SVKProtector rule, often triggering alerts during the daily 12:00 PM maintenance cycle.
  • Suggested Filter/Exclusion: Create an exclusion for process names starting with csfalcon.exe, csagent.exe, and paths within C:\Program Files\CrowdStrike\Falcon\*.

• Scenario: Scheduled backup job utilizing Veeam Backup & Replication.

  • Context: The Veeam Transport Service (VeeamTransportService.exe) creates temporary staging files in the C:\ProgramData\Veeam\Backup directory that mimic the binary characteristics of the detection rule, particularly when processing large image-based backups.
  • Suggested Filter/Exclusion: Exclude file paths under C:\ProgramData\Veeam\*