Hidden Files and Directories via Hidden Flag

Elastic Stack Serverless Security

Identify activity related where adversaries can add the hidden flag to files to hide them from the user in an attempt to evade detection.

Rule type: eql

Rule indices:

• logs-endpoint.events.*
• endgame-*
• auditbeat-*
• logs-auditd_manager.auditd-*
• logs-sentinel_one_cloud_funnel.*

Severity: low

Risk score: 21

Runs every: 5m

Searches indices from: now-9m (https://www.elastic.co/guide/en/elasticsearch/reference/current/common-options.html#date-math[Date Math format], see also Additional look-back time)

Maximum alerts per execution: 100

References: None

Tags:

• Domain: Endpoint
• OS: Linux
• OS: macOS
• Use Case: Threat Detection
• Tactic: Defense Evasion
• Data Source: Elastic Defend
• Data Source: Elastic Endgame
• Data Source: Auditd Manager
• Data Source: SentinelOne

Version: 103

Rule authors:

• Elastic

Rule license: Elastic License v2

file where host.os.type == "linux" and event.type == "creation" and process.name == "chflags"

Framework: MITRE ATT&CKTM

• Tactic:

  • Name: Defense Evasion
  • ID: TA0005
  • Reference URL: https://attack.mitre.org/tactics/TA0005/

• Technique:

  • Name: Hide Artifacts
  • ID: T1564
  • Reference URL: https://attack.mitre.org/techniques/T1564/

• Sub-technique:

  • Name: Hidden Files and Directories
  • ID: T1564.001
  • Reference URL: https://attack.mitre.org/techniques/T1564/001/