Ruben Groenewoud
b309bcb7ae
* [Rule Tuning] Q2 Linux DR Tuning - Part 5 * Update persistence_suspicious_ssh_execution_xzbackdoor.toml * Update persistence_rpm_package_installation_from_unusual_parent.toml
104 lines
3.3 KiB
TOML
104 lines
3.3 KiB
TOML
[metadata]
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creation_date = "2024/06/06"
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integration = ["endpoint"]
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maturity = "production"
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updated_date = "2024/10/17"
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[rule]
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author = ["Elastic"]
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description = """
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This rule identifies an egress internet connection initiated by an SSH Daemon child process. This behavior is
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indicative of the alteration of a shell configuration file or other mechanism that launches a process when a
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new SSH login occurs. Attackers can also backdoor the SSH daemon to allow for persistence, call out to a C2
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or to steal credentials.
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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 = "Network Connection Initiated by SSHD Child Process"
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references = ["https://hadess.io/the-art-of-linux-persistence/"]
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risk_score = 47
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rule_id = "63431796-f813-43af-820b-492ee2efec8e"
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severity = "medium"
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tags = [
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"Domain: Endpoint",
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"OS: Linux",
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"Use Case: Threat Detection",
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"Tactic: Persistence",
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"Data Source: Elastic Defend"
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]
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type = "eql"
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query = '''
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sequence by host.id with maxspan=1s
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[process where host.os.type == "linux" and event.type == "start" and event.action == "exec" and
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process.parent.executable == "/usr/sbin/sshd"] by process.entity_id
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[network where host.os.type == "linux" and event.type == "start" and event.action == "connection_attempted" and not (
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destination.ip == null or destination.ip == "0.0.0.0" or cidrmatch(
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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", "192.0.0.0/29",
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"192.0.0.8/32", "192.0.0.9/32", "192.0.0.10/32", "192.0.0.170/32", "192.0.0.171/32", "192.0.2.0/24",
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"192.31.196.0/24", "192.52.193.0/24", "192.168.0.0/16", "192.88.99.0/24", "224.0.0.0/4", "100.64.0.0/10",
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"192.175.48.0/24","198.18.0.0/15", "198.51.100.0/24", "203.0.113.0/24", "240.0.0.0/4", "::1", "FE80::/10",
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"FF00::/8", "172.31.0.0/16"
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)
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) and not (
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process.executable in ("/bin/yum", "/usr/bin/yum") or
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process.name in ("login_duo", "ssh", "sshd", "sshd-session")
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)
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] by process.parent.entity_id
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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.technique.subtechnique]]
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id = "T1546.004"
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name = "Unix Shell Configuration Modification"
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reference = "https://attack.mitre.org/techniques/T1546/004/"
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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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[[rule.threat]]
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framework = "MITRE ATT&CK"
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[[rule.threat.technique]]
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id = "T1021"
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name = "Remote Services"
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reference = "https://attack.mitre.org/techniques/T1021/"
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[[rule.threat.technique.subtechnique]]
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id = "T1021.004"
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name = "SSH"
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reference = "https://attack.mitre.org/techniques/T1021/004/"
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[[rule.threat.technique]]
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id = "T1563"
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name = "Remote Service Session Hijacking"
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reference = "https://attack.mitre.org/techniques/T1563/"
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[[rule.threat.technique.subtechnique]]
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id = "T1563.001"
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name = "SSH Hijacking"
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reference = "https://attack.mitre.org/techniques/T1563/001/"
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[rule.threat.tactic]
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id = "TA0008"
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name = "Lateral Movement"
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reference = "https://attack.mitre.org/tactics/TA0008/"
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[[rule.threat]]
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framework = "MITRE ATT&CK"
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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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