The SIEM app is now a part of the Elastic Security solution.
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IMPORTANT: No additional bug fixes or documentation updates will be released for this version.
IMPORTANT: No additional bug fixes or documentation updates will be released for this version.
File Permission Modification in Writable Directory
editFile Permission Modification in Writable Directoryedit
Identifies file permission modifications in common writable directories by a non-root user. Adversaries often drop files or payloads into a writable directory, and change permissions prior to execution.
Rule type: query
Rule indices:
- auditbeat-*
Severity: low
Risk score: 21
Runs every: 5 minutes
Searches indices from: now-6m (Date Math format, see also Additional look-back time
)
Maximum signals per execution: 100
Tags:
- Elastic
- Linux
Version: 1
Added (Elastic Stack release): 7.8.0
Potential false positivesedit
Certain programs or applications may modify files or change ownership in writable directories. These can be exempted by username.
Rule queryedit
event.action:executed and process.name:(chmod or chown or chattr or chgrp) and process.working_directory:(/tmp or /var/tmp or /dev/shm) and not user.name:root
Threat mappingedit
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
-
Technique:
- Name: File and Directory Permissions Modification
- ID: T1222
- Reference URL: https://attack.mitre.org/techniques/T1222/