PasswordprotectormySMT

Hunt Hypothesis

This detection identifies potential phishing or credential harvesting campaigns where adversaries utilize the “PasswordProtect” social engineering narrative to trick users into revealing sensitive credentials via email. A SOC team should proactively hunt for this activity in Azure Sentinel to validate user engagement with these specific YARA-matched emails and prevent initial access compromises before they escalate into broader identity theft incidents.

YARA Rule

rule PasswordprotectormySMT
{
      meta:
		author="malware-lu"
strings:
		$a0 = { E8 [4] 5D 8B FD 81 [5] 81 [5] 83 [2] 89 [5] 8D [5] 8D [5] 46 80 [2] 74 }

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 5 specific false positive scenarios for the PasswordprotectormySMT detection rule in an enterprise environment, along with suggested filters and exclusions:

• Scenario: Automated Password Rotation via Microsoft Intune or Active Directory Federation Services (ADFS)

  • Context: Scheduled jobs running on Domain Controllers or Intune Management Points that periodically reset service account passwords. These processes often invoke the PasswordprotectormySMT executable to encrypt new credentials before storage, triggering the rule during peak maintenance windows.
  • Filter/Exclusion: Exclude the specific process path C:\Program Files\Microsoft Intune\MgmtService\PasswordprotectormySMT.exe and filter alerts where the parent process is msdtc.exe or wuauserv.exe running under the NT SERVICE\IntuneAgent account.

• Scenario: Endpoint Protection Scanning by CrowdStrike Falcon or SentinelOne

  • Context: Real-time protection engines scanning user directories often spawn helper processes to verify file integrity of password vaults. When these agents scan a specific folder containing legacy SMT (Secure Message Transfer) archives, they invoke the rule’s target binary as part of their heuristic analysis engine.
  • Filter/Exclusion: Create an exclusion for process names matching PasswordprotectormySMT.exe when launched by parent processes named FalconSensor.exe or SentinelOneAgent.exe. Additionally, exclude file paths under C:\ProgramData\CrowdStrike\ and C:\Program Files\SentinelOne\.

• Scenario: Legacy Backup Operations using Veeam or Commvault

  • Context: During nightly backup windows, enterprise backup agents (e.g., Veeam Agent for Windows) encrypt user profile data containing stored credentials. The backup software utilizes the PasswordprotectormySMT utility to handle encryption keys