This documentation contains work-in-progress information for future Elastic Stack and Cloud releases. Use the version selector to view supported release docs. It also contains some Elastic Cloud serverless information. Check out our serverless docs for more details.

« Potential Persistence via Login Hook Potential Persistence via Atom Init Script Modification »

› ›

Suspicious Calendar File Modification

edit

Suspicious Calendar File Modification

edit

Identifies suspicious modifications of the calendar file by an unusual process. Adversaries may create a custom calendar notification procedure to execute a malicious program at a recurring interval to establish persistence.

Rule type: query

Rule indices:

logs-endpoint.events.*
auditbeat-*

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: 100

References:

Tags:

Elastic
Host
macOS
Threat Detection
Persistence

Version: 3

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

edit

event.category:file and event.action:modification and
  file.path:/Users/*/Library/Calendars/*.calendar/Events/*.ics and
  process.executable:
  (* and not
    (
      /System/Library/* or
      /System/Applications/Calendar.app/Contents/MacOS/* or
      /System/Applications/Mail.app/Contents/MacOS/Mail or
      /usr/libexec/xpcproxy or
      /sbin/launchd or
      /Applications/*
    )
  )

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Persistence
- ID: TA0003
- Reference URL: https://attack.mitre.org/tactics/TA0003/
Technique:
- Name: Event Triggered Execution
- ID: T1546
- Reference URL: https://attack.mitre.org/techniques/T1546/

« Potential Persistence via Login Hook Potential Persistence via Atom Init Script Modification »