SVKProtectorv132EngPavolCerven

Hunt Hypothesis

This hunt hypothesis targets the execution of the SVKProtector v132 engine by Pavol Cerven to identify potential legitimate security tool activity or unexpected deployment within the environment. Proactive hunting is recommended in Azure Sentinel to distinguish this specific YARA signature from anomalous behavior that could indicate a new security agent installation, a false positive requiring tuning, or an adversary leveraging similar protection mechanisms for stealth.

YARA Rule

rule SVKProtectorv132EngPavolCerven
{
      meta:
		author="malware-lu"
strings:
		$a0 = { 60 E8 00 00 00 00 5D 81 ED 06 00 00 00 EB 05 B8 06 36 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 5 specific false positive scenarios for the SVKProtectorv132EngPavolCerven detection rule, including suggested filters and exclusions tailored for an enterprise environment:

• Scenario: Automated Backup Agent Execution

  • Context: Enterprise backup solutions like Veeam Backup & Replication or Commvault often utilize SVKProtector components to scan and encrypt data during scheduled nightly windows. The rule may trigger when the agent process (vbr.exe or commcell_service) loads the SVK protector module to verify file integrity before archiving.
  • Filter/Exclusion: Create an exclusion based on the parent process name. Exclude alerts where the parent process is VeeamTransportService.exe, CommServe.exe, or vssvc.exe running under a dedicated service account (e.g., DOMAIN\BackupSvc).

• Scenario: Endpoint Detection and Response (EDR) Policy Updates

  • Context: When the organization’s EDR solution, such as CrowdStrike Falcon or Microsoft Defender for Endpoint, pushes a new policy update or performs a heuristic scan, it may instantiate the SVKProtector engine to analyze the payload of the incoming security definition. This is common during the “Definition Update” phase.
  • Filter/Exclusion: Implement a filter that excludes events occurring within 15 minutes of a known EDR policy deployment window (e.g., 02:00–04:00 UTC). Additionally, exclude processes running under the SYSTEM account with a parent process named FalconSensor.exe or MsMpEng.exe.

• Scenario: Software Deployment via Configuration Management

  • Context: During large-scale software deployments using tools like Microsoft SCCM (Configuration Manager) or Ansible, the deployment engine often invokes