Jonhnathan
76 lines
2.7 KiB
TOML
76 lines
2.7 KiB
TOML
[metadata]
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creation_date = "2021/02/23"
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maturity = "production"
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updated_date = "2022/08/17"
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[rule]
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author = ["Elastic"]
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description = """
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Detects the execution of a MacOS installer package with an abnormal child process (e.g bash) followed immediately by a network connection via a suspicious process (e.g curl).
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Threat actors will build and distribute malicious MacOS installer packages, which have a .pkg extension, many times imitating valid software in order to persuade and infect their victims often using the package files (e.g pre/post install scripts etc.) to download additional tools or malicious software.
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If this rule fires it should indicate the installation of a malicious or suspicious package.
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"""
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false_positives = [
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"""
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Custom organization-specific macOS packages that use .pkg files to run cURL could trigger this rule. If known
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behavior is causing false positives, it can be excluded from the rule.
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""",
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]
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from = "now-9m"
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index = ["logs-endpoint.events.*"]
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language = "eql"
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license = "Elastic License v2"
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name = "MacOS Installer Package Spawns Network Event"
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references = [
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"https://redcanary.com/blog/clipping-silver-sparrows-wings",
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"https://posts.specterops.io/introducing-mystikal-4fbd2f7ae520",
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"https://github.com/D00MFist/Mystikal"
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]
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risk_score = 47
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rule_id = "99239e7d-b0d4-46e3-8609-acafcf99f68c"
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severity = "medium"
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tags = ["Elastic", "Host", "macOS", "Threat Detection", "Execution", "Command and Control"]
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type = "eql"
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query = '''
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sequence by host.id, user.id with maxspan=30s
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[process where event.type == "start" and event.action == "exec" and process.parent.name : ("installer", "package_script_service") and process.name : ("bash", "sh", "zsh", "python", "osascript", "tclsh*")]
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[network where event.type == "start" and process.name : ("curl", "osascript", "wget", "python")]
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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 = "T1059"
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name = "Command and Scripting Interpreter"
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reference = "https://attack.mitre.org/techniques/T1059/"
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[[rule.threat.technique.subtechnique]]
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id = "T1059.007"
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name = "JavaScript"
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reference = "https://attack.mitre.org/techniques/T1059/007/"
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[rule.threat.tactic]
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id = "TA0002"
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name = "Execution"
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reference = "https://attack.mitre.org/tactics/TA0002/"
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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 = "T1071"
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name = "Application Layer Protocol"
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reference = "https://attack.mitre.org/techniques/T1071/"
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[[rule.threat.technique.subtechnique]]
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id = "T1071.001"
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name = "Web Protocols"
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reference = "https://attack.mitre.org/techniques/T1071/001/"
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[rule.threat.tactic]
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id = "TA0011"
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name = "Command and Control"
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reference = "https://attack.mitre.org/tactics/TA0011/"
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