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File with Suspicious Double Extension Created by Web Server

This rule detects when a web server process creates a file with a double extension, where the real extension is a non-web extension. This is a common technique used by attackers to bypass security measures and to…

Description

This rule detects when a web server process creates a file with a double extension, where the real extension is a non-web extension. This is a common technique used by attackers to bypass security measures and to hide the true nature of the file.

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
ContainersESXiIaaSLinuxmacOSNetwork DevicesWindows

The rule states no platform. This is derived from the 3 ATT&CK techniques it maps to.

Log source category
event_index

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