Justin Ibarra
50 lines
1.5 KiB
TOML
50 lines
1.5 KiB
TOML
[metadata]
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creation_date = "2020/09/02"
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ecs_version = ["1.6.0"]
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maturity = "production"
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updated_date = "2020/09/02"
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[rule]
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author = ["Elastic"]
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description = """
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Identifies unusual instances of Rundll32.exe making outbound network connections. This may indicate adversarial activity
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and may identify malicious DLLs.
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"""
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from = "now-9m"
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index = ["logs-endpoint.events.*", "winlogbeat-*"]
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language = "eql"
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license = "Elastic License"
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name = "Unusual Network Connection Sequence via RunDLL32"
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risk_score = 21
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rule_id = "2b347f66-6739-4ae3-bd94-195036dde8b3"
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severity = "low"
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tags = ["Elastic", "Windows"]
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type = "eql"
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query = '''
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sequence by process.entity_id with maxspan=2h
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[process where event.type in ("start", "process_started") and
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(process.name == "rundll32.exe" or process.pe.original_file_name == "rundll32.exe") and
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/* zero arguments excluding the binary itself (and accounting for when the binary may not be logged in args) */
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((process.args == "rundll32.exe" and process.args_count == 1) or
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(process.args != "rundll32.exe" and process.args_count == 0))]
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[network where event.type == "connection" and
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(process.name == "rundll32.exe" or process.pe.original_file_name == "rundll32.exe")]
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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 = "T1085"
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name = "Rundll32"
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reference = "https://attack.mitre.org/techniques/T1085/"
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[rule.threat.tactic]
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id = "TA0005"
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name = "Defense Evasion"
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reference = "https://attack.mitre.org/tactics/TA0005/"
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