Jonhnathan
8964e5d646
* Update network.direction
* bump updated_date
(cherry picked from commit cc241c0b5e)
52 lines
1.8 KiB
TOML
52 lines
1.8 KiB
TOML
[metadata]
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creation_date = "2020/08/24"
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maturity = "production"
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updated_date = "2021/10/13"
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[rule]
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author = ["Elastic"]
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description = """
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Identifies suspicious instances of the Windows Error Reporting process (WerFault.exe or Wermgr.exe) with matching
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command-line and process executable values performing outgoing network connections. This may be indicative of a
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masquerading attempt to evade suspicious child process behavior detections.
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"""
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false_positives = ["Legit Application Crash with rare Werfault commandline value"]
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from = "now-9m"
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index = ["winlogbeat-*", "logs-endpoint.events.*", "logs-windows.*"]
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language = "eql"
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license = "Elastic License v2"
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name = "Potential Windows Error Manager Masquerading"
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references = [
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"https://twitter.com/SBousseaden/status/1235533224337641473",
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"https://www.hexacorn.com/blog/2019/09/20/werfault-command-line-switches-v0-1/",
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"https://app.any.run/tasks/26051d84-b68e-4afb-8a9a-76921a271b81/",
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]
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risk_score = 47
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rule_id = "6ea41894-66c3-4df7-ad6b-2c5074eb3df8"
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severity = "medium"
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tags = ["Elastic", "Host", "Windows", "Threat Detection", "Defense Evasion"]
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type = "eql"
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query = '''
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sequence by host.id, process.entity_id with maxspan = 5s
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[process where event.type:"start" and process.name : ("wermgr.exe", "WerFault.exe") and process.args_count == 1]
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[network where process.name : ("wermgr.exe", "WerFault.exe") and network.protocol != "dns" and
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network.direction : ("outgoing", "egress") and destination.ip !="::1" and destination.ip !="127.0.0.1"
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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 = "T1036"
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name = "Masquerading"
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reference = "https://attack.mitre.org/techniques/T1036/"
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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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