DropperCreatorV01Conflict

Hunt Hypothesis

This detection identifies potential dropper activity where a process creates executable files that conflict with known benign patterns, suggesting an adversary attempting to establish persistence or deploy secondary payloads. SOC teams should proactively hunt for this behavior in Azure Sentinel to uncover low-severity indicators of compromise that may precede more significant attacks before they escalate into critical incidents.

YARA Rule

rule DropperCreatorV01Conflict
{
      meta:
		author="malware-lu"
strings:
		$a0 = { 60 E8 00 00 00 00 5D 8D 05 [4] 29 C5 8D 85 [4] 31 C0 64 03 40 30 78 0C 8B 40 0C 8B 70 1C AD 8B 40 08 EB 09 }

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 5 specific false positive scenarios for the DropperCreatorV01Conflict detection rule, including suggested filters and exclusions:

• Scenario: Automated Patch Deployment via SCCM/Intune

  • Context: System Center Configuration Manager (SCCM) or Microsoft Intune agents frequently execute a temporary dropper executable (ccmsetup.exe or Microsoft.IntuneManagementAgent) to unpack and deploy new security patches. This process often involves creating temporary files in the %TEMP% directory that match the signature of a generic dropper.
  • Suggested Filter/Exclusion: Create an exclusion for processes running under the CCMService or IntuneManagementExtension service accounts, specifically targeting file paths within C:\Windows\CCM\Logs and C:\ProgramData\Microsoft\IntuneManagement.

• Scenario: Scheduled Backup Agent Initialization

  • Context: Enterprise backup solutions like Veeam Backup & Replication or Acronis Cyber Protect often utilize a “dropper” mechanism to initialize the backup engine before starting the main job. This involves launching a lightweight installer that extracts configuration scripts and temporary binaries, which can trigger the YARA rule due to the creation of new executable artifacts in the system drive root.
  • Suggested Filter/Exclusion: Exclude process trees initiated by Veeam.Backup.Service.exe or AcronisCyberProtectService.exe. Add a path-based exclusion for directories such as C:\Program Files\Veeam\Backup and Replication and C:\ProgramData\Acronis.

• Scenario: Endpoint DLP Policy Enforcement

  • Context: Data Loss Prevention (DLP) agents, such as Symantec DLP or Microsoft Purview Information Protection, periodically scan user directories. When a new policy is pushed, the agent may drop