PrivatePersonalPackerPPPv102ConquestOfTroycom

Hunt Hypothesis

This detection identifies the presence of a specific executable packed by Private Personal Packer (PPP v102), which is frequently associated with the Conquest of Troy campaign and may indicate early-stage malware delivery or legitimate software deployment. Proactively hunting for this signature in Azure Sentinel allows the SOC team to distinguish between benign applications and potential threats leveraging this packing technique, ensuring timely investigation before adversaries establish persistence within the environment.

YARA Rule

rule PrivatePersonalPackerPPPv102ConquestOfTroycom
{
      meta:
		author="malware-lu"
strings:
		$a0 = { E8 17 00 00 00 E8 68 00 00 00 FF 35 2C 37 00 10 E8 ED 01 00 00 6A 00 E8 2E 04 00 00 E8 41 04 00 00 A3 74 37 00 10 6A 64 E8 5F 04 00 00 E8 30 04 00 00 A3 78 37 00 10 6A 64 E8 4E 04 00 00 E8 1F 04 00 00 A3 7C 37 00 10 A1 74 37 00 10 8B 1D 78 37 00 10 2B D8 8B 0D 7C 37 00 10 2B C8 83 FB 64 73 0F 81 F9 C8 00 00 00 73 07 6A 00 E8 D9 03 00 00 C3 6A 0A 6A 07 6A 00 }

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 PrivatePersonalPackerPPPv102ConquestOfTroycom detection rule, formatted with actionable filters:

• Scenario: Deployment of Enterprise Antivirus Definitions via Private Personal Packer (PPP)

  • Context: The organization utilizes a custom wrapper tool named “Private Personal Packer” to bundle and distribute daily antivirus definition updates from vendors like CrowdStrike or SentinelOne. When the deployment agent extracts these bundles on endpoint machines, the YARA rule matches the specific signature of the packer executable (PPPv102.exe) which mimics the “ConquestOfTroy” behavior pattern.
  • Suggested Filter: Exclude processes where the parent process is a known management service (e.g., SCCM, IntuneManagementExtension, or CrowdStrikeService) and the file path resides in a dedicated update directory, such as C:\Program Files\PrivatePersonalPacker\Updates\.

• Scenario: Scheduled Backup Job Executing via Custom Wrapper

  • Context: A nightly scheduled task (Task Scheduler ID: Backup_Wrapper_Job) runs the PPPv102 tool to compress and encrypt sensitive user data before transmission to an on-premise backup server. The rule triggers because the packer’s internal logic for “conquest” of file structures matches the detection signature during high-volume compression events at 02:00 AM.
  • Suggested Filter: Create a whitelist entry for the specific Scheduled Task name (Backup_Wrapper_Job) and restrict the alert to only trigger if the process is not running between 01:30 and 04:30 on weekdays, or explicitly exclude the command line argument --mode=backup.

• Scenario: Software Installation of Internal Line-of-Business (LOB) Applications *