IMPORTANT: No additional bug fixes or documentation updates
will be released for this version. For the latest information, see the
current release documentation.
Suspicious Calendar File Modification
editSuspicious Calendar File Modification
editIdentifies 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.*
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:
- Domain: Endpoint
- OS: macOS
- Use Case: Threat Detection
- Tactic: Persistence
- Data Source: Elastic Defend
Version: 105
Rule authors:
- Elastic
Rule license: Elastic License v2
Rule query
editevent.category:file and host.os.type:macos 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&CKTM
-
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/