Litev003a

Hunt Hypothesis

This YARA rule targets specific file patterns or memory signatures associated with the Litev003a component, potentially indicating the presence of a low-severity tool or script used for initial access or post-exploitation activities. Proactively hunting for these artifacts in Azure Sentinel allows the SOC team to identify subtle or dormant threats that may evade standard behavioral detections, ensuring early visibility into potentially benign but suspicious file executions within the environment.

YARA Rule

rule Litev003a
{
      meta:
		author="malware-lu"
strings:
		$a0 = { 60 06 FC 1E 07 BE [4] 6A 04 68 ?? 10 [2] 68 }

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

• Scenario: A security team executes a YARA scan using YARA (yara.exe) or YARA-L to validate new signatures against a corpus of application binaries or memory dumps. The rule Litev003a is likely designed to detect specific malicious patterns (e.g., a known RCE payload, C2 beacon, or specific library injection), but if the scan includes legitimate development tools, test fixtures, or known-good binaries that contain similar byte sequences or string patterns, it may trigger a match.

  • Filter/Exclusion: Exclude processes where the executable name is yara.exe, yarascan.exe, or yara64.exe. Additionally, exclude file paths under standard development or testing directories such as C:\Dev\YaraSignatures\ or C:\QA\MemoryDumps\.

• Scenario: An enterprise backup solution like Veeam Backup & Replication or Commvault performs a restore or verification task that temporarily materializes backup files to a staging area (e.g., C:\Temp\VeeamRestore\). If the backup contains an application that was previously infected or contains a known benign binary with a pattern matching Litev003a, the file on disk may trigger the YARA rule during the restore process.

  • Filter/Exclusion: Exclude file paths containing Veeam, Commvault, or Backup in the directory structure. Specifically, exclude paths like C:\ProgramData\Veeam\Backup\ or D:\BackupStaging\.

• Scenario: A software deployment tool like Ansible, Chef, or Puppet pushes a configuration file or a small utility script (e.g., a PowerShell wrapper or a C# helper) to endpoints. If the file content includes specific strings or binary patterns that coincidentally match