Brent Murphy
12577f7380
* Update network rule address blocks Co-authored-by: David French <56409778+threat-punter@users.noreply.github.com>
50 lines
1.8 KiB
TOML
50 lines
1.8 KiB
TOML
[metadata]
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creation_date = "2020/03/19"
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maturity = "production"
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updated_date = "2021/05/26"
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[rule]
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author = ["Elastic"]
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description = """
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Identifies certutil.exe making a network connection. Adversaries could abuse certutil.exe to download a certificate, or
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malware, from a remote URL.
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"""
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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 = "Network Connection via Certutil"
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references = ["https://www.iana.org/assignments/iana-ipv4-special-registry/iana-ipv4-special-registry.xhtml"]
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risk_score = 21
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rule_id = "3838e0e3-1850-4850-a411-2e8c5ba40ba8"
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severity = "low"
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tags = ["Elastic", "Host", "Windows", "Threat Detection", "Command and Control"]
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type = "eql"
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query = '''
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sequence by process.entity_id
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[process where process.name : "certutil.exe" and event.type == "start"]
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[network where process.name : "certutil.exe" and
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not cidrmatch(destination.ip, "10.0.0.0/8", "127.0.0.0/8", "169.254.0.0/16", "172.16.0.0/12", "192.0.0.0/24",
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"192.0.0.0/29", "192.0.0.8/32", "192.0.0.9/32", "192.0.0.10/32", "192.0.0.170/32",
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"192.0.0.171/32", "192.0.2.0/24", "192.31.196.0/24", "192.52.193.0/24",
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"192.168.0.0/16", "192.88.99.0/24", "224.0.0.0/4", "100.64.0.0/10", "192.175.48.0/24",
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"198.18.0.0/15", "198.51.100.0/24", "203.0.113.0/24", "240.0.0.0/4", "::1",
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"FE80::/10", "FF00::/8")]
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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 = "T1105"
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name = "Ingress Tool Transfer"
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reference = "https://attack.mitre.org/techniques/T1105/"
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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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