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MediumSigmaHQSwachchhanda Shrawan Poudel (Nextron Systems)

Notepad++ Updater DNS Query to Uncommon Domains

Detects when the Notepad++ updater (gup.exe) makes DNS queries to domains that are not part of the known legitimate update infrastructure. This could indicate potential exploitation of the updater mechanism or…

Description

Detects when the Notepad++ updater (gup.exe) makes DNS queries to domains that are not part of the known legitimate update infrastructure. This could indicate potential exploitation of the updater mechanism or suspicious network activity that warrants further investigation.

Detection logic

Detection requirements

Platform
LinuxmacOSNetwork DevicesWindows

The rule states no platform. This is derived from the 2 ATT&CK techniques it maps to.

Log source product
windows
Log source category
dns_query

Known benign triggers

  • Other legitimate query to official domains not listed in the filter, needing tuning.
  • Some legitimate network misconfigurations or proxy issues causing unexpected DNS queries.

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