dUP2xPatcherwwwdiablo2oo2cjbnet

Hunt Hypothesis

This detection identifies potential malicious activity from a specific patching utility or web-based tool associated with the “dUP2xPatcher” signature, which may indicate an adversary leveraging legitimate software for initial access or lateral movement. The SOC team should proactively hunt for this behavior in Azure Sentinel to validate whether these low-severity events represent benign administrative tasks or early-stage indicators of a targeted campaign that could escalate if left unmonitored.

YARA Rule

rule dUP2xPatcherwwwdiablo2oo2cjbnet
{
      meta:
		author="malware-lu"
strings:
		$a0 = { 8B CB 85 C9 74 ?? 80 3A 01 74 08 AC AE 75 0A 42 49 EB EF 47 46 42 49 EB E9 }

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 detection rule dUP2xPatcherwwwdiablo2oo2cjbnet, along with suggested filters and exclusions tailored for a legitimate enterprise environment:

• Scenario 1: Scheduled Patch Deployment via Microsoft Endpoint Configuration Manager (SCCM)

  • Context: During nightly maintenance windows, the SCCM client service (ccmexec.exe) executes the “dUP2xPatcher” utility to apply cumulative updates or specific hotfixes. The YARA rule triggers because the patcher executable matches the signature of a known benign deployment tool often used in legacy infrastructure upgrades.
  • Suggested Filter/Exclusion: Create an exclusion based on the parent process name and path. Exclude alerts where ParentProcessName is ccmexec.exe AND FilePath contains \Microsoft Endpoint Configuration Manager\.

• Scenario 2: Automated Backup Verification by Veeam Backup & Replication

  • Context: The Veeam backup job (Veeam.Backup.Service.exe) runs a post-backup integrity check that invokes the “dUP2xPatcher” module to verify database consistency or update metadata. This process often spawns child processes with similar naming conventions, causing the YARA rule to flag it as suspicious activity despite being part of standard backup hygiene.
  • Suggested Filter/Exclusion: Add a whitelist for the specific hash or file path of the Veeam service. Exclude events where ProcessName is Veeam.Backup.Service.exe and the triggered child process contains dUP2xPatcher in its command line arguments.

• Scenario 3: Legacy Application Maintenance by Admin via PowerShell

  • Context: System administrators frequently run manual or scheduled PowerShell scripts (powershell.exe) to update legacy ERP modules (e.g., SAP or Oracle