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Detect HTML Help URL in Command Line

Splunk Security Content

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Summary
This detection rule identifies the execution of `hh.exe`, which is associated with Compiled HTML Help (CHM) files, specifically when loading these files from a remote URL. The presence of command-line arguments containing URLs during the execution of this process is monitored via Endpoint Detection and Response (EDR) systems, particularly leveraging Sysmon and Windows Event Logs. The rationale behind this detection lies in the fact that executing remote CHM files can be indicative of attempts to execute malicious scripts that could utilize scripting engines like JScript or VBScript. Such activity is significant as it could potentially enable attackers to execute unauthorized code, leading to system compromise or data theft. The rule provides insight into suspicious actions on endpoints, allowing for timely responses to potential threats.
Categories
  • Endpoint
Data Sources
  • Windows Registry
  • Command
  • Process
  • File
ATT&CK Techniques
  • T1218
  • T1218.001
Created: 2024-12-10