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Suspicious Child Process of Notepad++ Updater - GUP.Exe

Sigma Rules

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Summary
This rule is designed to detect suspicious activities associated with the Notepad++ updater process (gup.exe). In particular, it identifies scenarios where gup.exe creates child processes that are commonly associated with potentially malicious activities, such as cmd.exe, powershell.exe, and various script execution commands. The purpose of this detection is to flag any attempts to exploit the updater component of Notepad++ to deliver malware or perform unauthorized actions on the system. The detection logic involves monitoring the creation of these child processes initiated by gup.exe, specifically looking for command lines that may indicate further exploitation or compromise. High-profile cases have linked Notepad++'s updater to malware delivery, necessitating close monitoring of its execution patterns to safeguard users against such threats.
Categories
  • Endpoint
  • Windows
Data Sources
  • Process
Created: 2026-02-03