Disclosed hacktool set - file Thecard.bat

Hunt Hypothesis

This hunt hypothesis targets adversaries deploying custom batch scripts like “Thecard.bat” to establish a foothold and execute initial reconnaissance or lateral movement tools within the environment. Proactively hunting for this behavior in Azure Sentinel is critical because such disclosed hacktools often serve as early indicators of compromise that may evade standard signature-based detection, allowing attackers to maintain persistence before triggering broader alerts.

YARA Rule

rule Hacktools_CN_Burst_Thecard {
	meta:
		description = "Disclosed hacktool set - file Thecard.bat"
		author = "Florian Roth"
		date = "17.11.14"
		score = 60
		hash = "50b01ea0bfa5ded855b19b024d39a3d632bacb4c"
	strings:
		$s0 = "tasklist |find \"Clear.bat\"||start Clear.bat" fullword ascii
		$s1 = "Http://www.coffeewl.com" fullword ascii
		$s2 = "ping -n 2 localhost 1>nul 2>nul" fullword ascii
		$s3 = "for /L %%a in (" fullword ascii
		$s4 = "MODE con: COLS=42 lines=5" fullword ascii
	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 5 string patterns in its detection logic.

• Source Rule

False Positive Guidance

Here are 5 specific false positive scenarios for the Disclosed hacktool set - file Thecard.bat detection rule, including suggested filters and exclusions:

• Scenario: Automated Point-of-Sale (POS) Maintenance Script

  • Context: A scheduled task running nightly on retail POS terminals executes Thecard.bat to synchronize card reader firmware and update transaction logs. This is a standard vendor-provided maintenance routine for payment hardware.
  • Filter/Exclusion: Exclude the specific file path (e.g., C:\Program Files\CardVendor\Maintenance\Thecard.bat) from the rule, or add a filter where the process name matches the known vendor executable launching this batch file.

• Scenario: IT Helpdesk Remote Session Initialization

  • Context: When an IT administrator initiates a remote support session (using tools like BeyondTrust or TeamViewer) to troubleshoot card terminal issues, the remote management agent launches Thecard.bat as part of its diagnostic startup sequence.
  • Filter/Exclusion: Create an exclusion for executions where the parent process is a known Remote Desktop or RMM tool (e.g., BeyondTrust.exe, TeamViewer_Service.exe) and the user context is a member of the “IT_Admins” security group.

• Scenario: Third-Party Inventory Management Tool

  • Context: The enterprise uses an inventory management suite that includes a module for tracking card reader assets. During daily data collection, the application triggers Thecard.bat to query device status and update the central database.
  • Filter/Exclusion: Filter out alerts where the command line arguments contain specific flags unique to this tool (e.g., --mode=inventory-sync) or exclude the hash of Thecard.bat if it matches the known good version deployed by the inventory vendor.

• Scenario: Scheduled Group Policy