Aluwainv809

Hunt Hypothesis

This detection identifies potential malicious activity associated with the Aluwainv809 signature by leveraging YARA pattern matching to isolate specific file or process behaviors indicative of known threats. Proactive hunting for this rule in Azure Sentinel is essential to uncover low-severity indicators that may represent early-stage adversary reconnaissance or lateral movement, ensuring timely intervention before escalation occurs.

YARA Rule

rule Aluwainv809
{
      meta:
		author="malware-lu"
strings:
		$a0 = { 8B EC 1E E8 [2] 9D 5E }

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 Aluwainv809 detection rule in an enterprise environment, including suggested filters and exclusions:

• Scenario: Antivirus Engine Self-Scanning

  • Context: The YARA rule detects the signature of Aluwainv809 when the primary endpoint protection suite (e.g., CrowdStrike Falcon, Microsoft Defender for Endpoint, or Symantec Endpoint Protection) performs its scheduled daily deep scan. During this process, the AV engine spawns child processes that inherit the parent’s digital signature and memory footprint, triggering the rule on legitimate scanning activity rather than malicious behavior.
  • Filter/Exclusion: Create a process exclusion for the specific AV service executable (e.g., C:\Program Files\CrowdStrike\fsq.exe or MsMpEng.exe) and its known child processes. Additionally, exclude file paths within the AV installation directory (C:\ProgramData\<AV_Vendor>\).

• Scenario: Scheduled Patch Deployment via SCCM

  • Context: During the weekly maintenance window (e.g., Tuesdays at 02:00 AM), Microsoft Endpoint Configuration Manager (MECM/SCCM) pushes cumulative updates to workstations. The deployment agent (ccmsetup.exe or WUAHandler.exe) extracts and installs packages that match the byte-pattern of the Aluwainv809 signature, causing a high volume of alerts during the update cycle.
  • Filter/Exclusion: Implement a time-based filter to suppress alerts between 01:30 AM and 04:30 AM on Tuesdays for processes initiated by ccmsetup.exe. Alternatively, exclude any process tree where the parent is WUAHandler.exe or TaskHostW.exe running under the “System” account.