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
105 lines
3.4 KiB
TOML
105 lines
3.4 KiB
TOML
[metadata]
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creation_date = "2024/04/01"
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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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It identifies potential malicious shell executions through remote SSH and detects cases where the sshd service suddenly
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terminates soon after successful execution, suggesting suspicious behavior similar to the XZ backdoor.
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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 = "Potential Execution via XZBackdoor"
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references = [
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"https://github.com/amlweems/xzbot",
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"https://access.redhat.com/security/cve/CVE-2024-3094",
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"https://www.elastic.co/security-labs/500ms-to-midnight",
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]
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risk_score = 73
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rule_id = "7afc6cc9-8800-4c7f-be6b-b688d2dea248"
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severity = "high"
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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: Credential Access",
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"Tactic: Persistence",
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"Tactic: Lateral Movement",
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"Data Source: Elastic Defend",
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]
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timestamp_override = "event.ingested"
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type = "eql"
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query = '''
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sequence by host.id, user.id with maxspan=1s
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[process where host.os.type == "linux" and event.type == "start" and event.action == "exec" and process.name == "sshd" and
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process.args == "-D" and process.args == "-R"] by process.pid, process.entity_id
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[process where host.os.type == "linux" and event.type == "start" and event.action == "exec" and process.parent.name == "sshd" and
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process.executable != null and not (
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process.executable in ("/usr/sbin/sshd", "/usr/sbin/unix_chkpwd", "/usr/bin/google_authorized_keys", "/usr/bin/fipscheck") or
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process.args like ("rsync*", "systemctl*", "/usr/sbin/unix_chkpwd", "/usr/bin/google_authorized_keys", "/usr/sbin/aad_certhandler*") or
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process.command_line like "sh -c /usr/bin/env -i PATH=*"
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)] by process.parent.pid, process.parent.entity_id
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[process where host.os.type == "linux" and event.action == "end" and process.name == "sshd" and process.exit_code != 0] by process.pid, process.entity_id
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[network where host.os.type == "linux" and event.type == "end" and event.action == "disconnect_received" and process.name == "sshd"] by process.pid, process.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 = "T1543"
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name = "Create or Modify System Process"
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reference = "https://attack.mitre.org/techniques/T1543/"
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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 = "T1556"
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name = "Modify Authentication Process"
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reference = "https://attack.mitre.org/techniques/T1556/"
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[rule.threat.tactic]
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id = "TA0006"
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name = "Credential Access"
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reference = "https://attack.mitre.org/tactics/TA0006/"
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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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