Mika Ayenson
60 lines
1.7 KiB
TOML
60 lines
1.7 KiB
TOML
[metadata]
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creation_date = "2021/01/19"
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maturity = "production"
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updated_date = "2022/07/27"
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[rule]
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author = ["Elastic"]
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description = """
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Identifies suspicious modifications of the calendar file by an unusual process. Adversaries may create a custom calendar
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notification procedure to execute a malicious program at a recurring interval to establish persistence.
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"""
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false_positives = ["Trusted applications for managing calendars and reminders."]
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from = "now-9m"
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index = ["logs-endpoint.events.*", "auditbeat-*"]
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language = "kuery"
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license = "Elastic License v2"
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name = "Suspicious Calendar File Modification"
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references = [
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"https://labs.f-secure.com/blog/operationalising-calendar-alerts-persistence-on-macos",
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"https://github.com/FSecureLABS/CalendarPersist",
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"https://github.com/D00MFist/PersistentJXA/blob/master/CalendarPersist.js",
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]
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risk_score = 47
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rule_id = "cb71aa62-55c8-42f0-b0dd-afb0bb0b1f51"
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severity = "medium"
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tags = ["Elastic", "Host", "macOS", "Threat Detection", "Persistence"]
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timestamp_override = "event.ingested"
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type = "query"
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query = '''
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event.category:file and event.action:modification and
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file.path:/Users/*/Library/Calendars/*.calendar/Events/*.ics and
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process.executable:
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(* and not
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(
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/System/Library/* or
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/System/Applications/Calendar.app/Contents/MacOS/* or
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/System/Applications/Mail.app/Contents/MacOS/Mail or
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/usr/libexec/xpcproxy or
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/sbin/launchd or
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/Applications/*
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)
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)
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'''
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[[rule.threat]]
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framework = "MITRE ATT&CK"
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[[rule.threat.technique]]
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id = "T1546"
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name = "Event Triggered Execution"
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reference = "https://attack.mitre.org/techniques/T1546/"
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[rule.threat.tactic]
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id = "TA0003"
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name = "Persistence"
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reference = "https://attack.mitre.org/tactics/TA0003/"
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