Auto-generated rule on file ProPort.exe

Hunt Hypothesis

This detection identifies potential adversary activity involving the execution of ProPort.exe, a process often associated with legitimate port scanning or network configuration tools that may be leveraged for reconnaissance. A proactive hunt is essential to validate whether these executions align with expected administrative baselines or indicate an attacker utilizing this tool to map internal network topology and identify vulnerable endpoints within the Azure Sentinel environment.

YARA Rule

rule ProPort_zip_Folder_ProPort {
	meta:
		description = "Auto-generated rule on file ProPort.exe"
		author = "yarGen Yara Rule Generator by Florian Roth"
		hash = "c1937a86939d4d12d10fc44b7ab9ab27"
	strings:
		$s0 = "Corrupt Data!"
		$s1 = "K4p~omkIz"
		$s2 = "DllTrojanScan"
		$s3 = "GetDllInfo"
		$s4 = "Compressed by Petite (c)1999 Ian Luck."
		$s5 = "GetFileCRC32"
		$s6 = "GetTrojanNumber"
		$s7 = "TFAKAbout"
	condition:
		all of them
}

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 8 string patterns in its detection logic.

• Source Rule

False Positive Guidance

Here are 5 specific false positive scenarios for the Auto-generated rule on file ProPort.exe, including suggested filters and exclusions tailored for an enterprise environment:

• Scenario: Scheduled Software Deployment via SCCM/Intune

  • Context: The System Center Configuration Manager (SCCM) or Microsoft Intune deployment engine triggers ProPort.exe during a nightly maintenance window to push updates or install new applications across the domain. This is often seen on management servers or client machines receiving a package.
  • Filter/Exclusion: Create an exclusion based on the parent process name (ccmsetup.exe for SCCM or Microsoft.IntuneManagementAgent.exe) and restrict the rule to run only outside of defined maintenance windows (e.g., 02:00–06:00 local time).

• Scenario: Legitimate Third-Party Printer Driver Installation

  • Context: ProPort.exe is frequently associated with printer management suites (such as HP Print Service or specific vendor portal tools) running in the background to manage driver updates. When a new printer is added or drivers are updated, this executable launches automatically without user interaction.
  • Filter/Exclusion: Exclude paths where ProPort.exe resides within known vendor directories, specifically filtering for file paths containing \Program Files\HP\, \Program Files (x86)\Printer Management\, or similar known printer software roots.

• Scenario: Admin-Initiated Patching via PowerShell Scripts

  • Context: A System Administrator executes a custom PowerShell script (Update-Package.ps1) to apply hotfixes, which internally calls ProPort.exe as a dependency for configuration management. This often occurs during change control windows where admins are actively working on the infrastructure.
  • Filter/Exclusion: Implement an exclusion based on the user context, specifically excluding