Creation of Hidden Shared Object Fileedit

Identifies the creation of a hidden shared object (.so) file. Users can mark specific files as hidden simply by putting a "." as the first character in the file or folder name. Adversaries can use this to their advantage to hide files and folders on the system for persistence and defense evasion.

Rule type: eql

Rule indices:

  • auditbeat-*

Severity: medium

Risk score: 47

Runs every: 5 minutes

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 33


  • Elastic
  • Host
  • Linux
  • Threat Detection
  • Defense Evasion

Version: 100 (version history)

Added (Elastic Stack release): 8.4.0

Last modified (Elastic Stack release): 8.5.0

Rule authors: Elastic

Rule license: Elastic License v2

Investigation guideedit

Rule queryedit

file where event.action : "creation" and file.extension == "so" and : ".*.so"

Threat mappingedit


Rule version historyedit

Version 100 (8.5.0 release)
  • Updated query, changed from:

    file where event.action : "creation" and file.extension == "so" and : ".*.so"