IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

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File Permission Modification in Writable Directory

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File Permission Modification in Writable Directory

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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: new_terms

Rule indices:

auditbeat-*
logs-endpoint.events.*

Severity: low

Risk score: 21

Runs every: 5m

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

Maximum alerts per execution: 100

References: None

Tags:

Domain: Endpoint
OS: Linux
Use Case: Threat Detection
Tactic: Defense Evasion
Data Source: Elastic Defend

Version: 208

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

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host.os.type:linux and event.category:process and event.type:start and
process.name:((chattr or chgrp or chmod or chown) and
not (apt-key or update-motd-updates-available)) and
process.working_directory:(/dev/shm or /tmp or /var/tmp)

Framework: MITRE ATT&CK^TM

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/

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