TheHypersprotectorTheHyper

Hunt Hypothesis

This hunt hypothesis targets adversaries leveraging custom malware signatures identified by the “TheHypersprotectorTheHyper” YARA rule to detect stealthy file-based threats that may evade standard signature updates. Proactively hunting for this behavior in Azure Sentinel is essential to uncover low-severity, early-stage compromises before they escalate into significant data exfiltration or lateral movement incidents.

YARA Rule

rule TheHypersprotectorTheHyper
{
      meta:
		author="malware-lu"
strings:
		$a0 = { 55 8B EC 83 EC 14 8B FC E8 14 00 00 00 [2] 01 01 [2] 01 01 [3] 00 [2] 01 01 [2] 02 01 5E E8 0D 00 00 00 6B 65 72 6E 65 6C 33 32 2E 64 6C 6C 00 8B 46 04 FF 10 8B D8 E8 0D 00 00 00 56 69 72 74 75 61 6C 41 6C 6C 6F 63 00 53 8B 06 FF 10 89 07 E8 }

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 TheHypersprotectorTheHyper detection rule, including suggested filters and exclusions tailored for an enterprise environment:

• Scenario: Microsoft Defender Antivirus (MSRT) Self-Protection Updates

  • Context: The rule triggers when the MsMpEng.exe process updates its own protection engine or security intelligence definitions. This often involves writing to protected system directories that match the YARA signature’s file path or behavior patterns.
  • Suggested Filter/Exclusion: Exclude processes where the executable image path matches C:\Program Files\Windows Defender\MsMpEng.exe AND the parent process is svchost.exe (specifically the Wuauserv service). Alternatively, add a hash exclusion for known good versions of the MSRT update installer.

• Scenario: Scheduled System Health Analyzer (SHA) Jobs

  • Context: Windows Task Scheduler runs the “System Health Analyzer” (DiagTrack.exe) which scans system integrity and generates detailed logs in protected folders. The YARA rule may misinterpret the heavy I/O operations and file creation patterns of SHA as suspicious activity.
  • Suggested Filter/Exclusion: Create a whitelist for the Microsoft.Windows.SystemHealthAnalyzer scheduled task. Configure the detection to ignore events where the parent process is TaskScheduler.exe and the command line contains DiagTrack.exe.

• Scenario: Enterprise Backup Solutions (e.g., Veeam or Commvault) Snapshot Operations

  • Context: During nightly backup windows, agents like VeeamTransportService.exe or CommServe.exe mount virtual disks and write large data blocks to the hypervisor layer. The rule’s logic regarding “hypervisor protection” may flag these high-volume writes as anomalous behavior.
  • **Suggested Filter/Ex