DrWebVirusFindingEngineInSoftEDVSysteme

Hunt Hypothesis

This detection identifies potential malware activity by leveraging a specialized YARA signature to pinpoint specific virus engine behaviors within the SoftEDV system environment. A proactive hunt is essential for Azure Sentinel users to validate these low-severity findings early, ensuring that subtle indicators of compromise are not overlooked before they escalate into broader incidents.

YARA Rule

rule DrWebVirusFindingEngineInSoftEDVSysteme
{
      meta:
		author="malware-lu"
strings:
		$a0 = { B8 01 00 00 00 C2 0C 00 8D 80 00 00 00 00 8B D2 8B ?? 24 04 }

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 3-5 specific false positive scenarios for the DrWebVirusFindingEngineInSoftEDVSysteme detection rule, including suggested filters and exclusions:

• Scenario: Scheduled Antivirus Full Scan Execution

  • Context: The enterprise’s endpoint protection suite (e.g., Dr.Web Security Space or Symantec Endpoint Protection) runs a scheduled “Full System Scan” every night at 02:00 AM. During this window, the DrWeb engine actively scans all mounted drives and temporary folders, triggering the YARA rule as it reads through its own signature database and heuristic engines.
  • Suggested Filter/Exclusion: Create a time-based exclusion for the rule to ignore alerts generated between 01:30 AM and 04:30 AM on weekdays (Monday–Friday). Alternatively, exclude process paths matching C:\Program Files\Dr.Web Anti-virus\bin\ or specific scheduled task names like \Microsoft\Windows\TaskScheduler\DrWebFullScan.

• Scenario: Software Deployment via Endpoint Management Tools

  • Context: The IT Operations team utilizes Microsoft System Center Configuration Manager (SCCM) or Ivanti Neurons to push a new software update package. As the deployment agent installs the application, it extracts compressed archives and writes temporary files that are immediately scanned by the local DrWeb engine, causing the detection logic to flag the scanning activity as a potential anomaly.
  • Suggested Filter/Exclusion: Exclude alerts where the parent process is ccmsetup.exe (SCCM) or IvantiAgent.exe. Additionally, filter out events occurring during known deployment windows defined in the Change Management system (e.g., Tuesday 10:00–14:00).

• Scenario: Automated Backup and Archiving Jobs

  • Context: A nightly backup job