Creation of Hidden Files and Directories via CommandLineedit

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. This rule looks for hidden files or folders in common writable directories.

Rule type: eql

Rule indices:

  • auditbeat-*
  • logs-endpoint.events.*

Severity: medium

Risk score: 47

Runs every: 5m

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

Maximum alerts per execution: 33

References: None

Tags:

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

Version: 10

Rule authors:

  • Elastic

Rule license: Elastic License v2

Investigation guideedit


Rule queryedit

process where event.type in ("start", "process_started") and
  process.working_directory in ("/tmp", "/var/tmp", "/dev/shm") and
  process.args regex~ """\.[a-z0-9_\-][a-z0-9_\-\.]{1,254}""" and
  not process.name in ("ls", "find", "grep")

Framework: MITRE ATT&CKTM