Themida1201OreansTechnologies

Hunt Hypothesis

This detection identifies potential execution of binaries protected by Orean Technologies’ Themida virtualization engine, which is frequently employed by malware authors to evade static analysis and sandboxing. Proactively hunting for this signature in Azure Sentinel allows the SOC team to distinguish between legitimate enterprise applications and suspicious obfuscated payloads that may indicate an adversary attempting to bypass traditional detection mechanisms.

YARA Rule

rule Themida1201OreansTechnologies
{
      meta:
		author="malware-lu"
strings:
		$a0 = { 8B C5 8B D4 60 E8 00 00 00 00 5D 81 ED [2] 35 09 89 95 [2] 35 09 89 B5 [2] 35 09 89 85 [2] 35 09 83 BD [2] 35 09 00 74 0C 8B E8 8B E2 B8 01 00 00 00 C2 0C 00 8B 44 24 24 89 85 [2] 35 09 6A 45 E8 A3 00 00 00 68 9A 74 83 07 E8 DF 00 00 00 68 25 }

condition:
		$a0
}

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 Themida1201OreansTechnologies detection rule, including suggested filters and exclusions:

• Scenario: Automated Deployment via Ansible or Puppet

  • Context: In enterprise environments, configuration management tools like Ansible, Puppet, or Chef often deploy protected applications (e.g., banking software or ERP modules) that are compiled with Themida protection. During a scheduled nightly deployment job, the agent scans these binaries and triggers the rule as new “protected” executables appear on disk.
  • Suggested Filter/Exclusion: Exclude processes where the parent process is ansible-runner, puppet-agent, or chef-client. Additionally, add an exclusion for files located in specific deployment directories (e.g., C:\Program Files\OreansTech\DeployedApps\) to prevent re-triggering on repeated deployments.

• Scenario: Endpoint Protection Scanning by CrowdStrike or SentinelOne

  • Context: The organization’s primary EDR solution, such as CrowdStrike Falcon or SentinelOne, performs real-time scanning of the file system. When the EDR engine opens a Themida-protected executable to verify its integrity or scan for malware, the YARA rule detects the binary signature and flags it as a potential new deployment or suspicious activity, even though it is a routine health check.
  • Suggested Filter/Exclusion: Create an exclusion based on the parent process name. If the ParentProcessName matches C-Drive.exe (CrowdStrike) or SentinelOne.exe, suppress the alert. Alternatively, exclude file paths containing \Windows\System32\ if the protected app is a system-level service.

• Scenario: Scheduled Backup Jobs by Veeam or Commvault *