IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.
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
Risk score: 47
Runs every: 5 minutes
Searches indices from: now-9m (Date Math format, see also
Additional look-back time)
Maximum alerts per execution: 100
- Threat Detection
Added (Elastic Stack release): 7.12.0
Rule authors: Elastic
Rule license: Elastic License v2
Trusted applications for managing calendars and reminders.
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 /usr/libexec/xpcproxy or /sbin/launchd or /Applications/* ) )
Framework: MITRE ATT&CKTM
- Name: Persistence
- ID: TA0003
- Reference URL: https://attack.mitre.org/tactics/TA0003/
- Name: Event Triggered Execution
- ID: T1546
- Reference URL: https://attack.mitre.org/techniques/T1546/
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