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Suspicious IDE Extension Installation from VSIX

Detects installation of an IDE extension from a local VSIX ("--install-extension" with a ".vsix" path) when that path is in a staging directory, or the parent is a script host or installer. VS Code and compatible…

Description

Detects installation of an IDE extension from a local VSIX ("--install-extension" with a ".vsix" path) when that path is in a staging directory, or the parent is a script host or installer. VS Code and compatible editors (Cursor, VSCodium, Windsurf) use this CLI to sideload extensions outside the marketplace.

Detection logic

Its licence does not clear it for publishing here

Sunturai publishes a detection's own text where the licence it arrived under has been reviewed and permits it, and Elastic License 2.0 has not. The query as its source wrote it, its canonical form and the hash that pins this revision are in the workspace record.

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Detection requirements

Platform
LinuxmacOSWindows

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

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