sigma-rules/rules/linux/execution_unix_socket_communication.toml

[metadata]
creation_date = "2023/09/04"
integration = ["endpoint", "auditd_manager"]
maturity = "production"
updated_date = "2024/10/18"

[rule]
author = ["Elastic"]
description = """
This rule monitors for inter-process communication via Unix sockets. Adversaries may attempt to communicate with local
Unix sockets to enumerate application details, find vulnerabilities/configuration mistakes and potentially escalate
privileges or set up malicious communication channels via Unix sockets for inter-process communication to attempt to
evade detection.
"""
from = "now-9m"
index = ["logs-endpoint.events.*", "endgame-*", "auditbeat-*", "logs-auditd_manager.auditd-*"]
language = "eql"
license = "Elastic License v2"
name = "Unix Socket Connection"
risk_score = 21
rule_id = "41284ba3-ed1a-4598-bfba-a97f75d9aba2"
severity = "low"
tags = [
    "Domain: Endpoint",
    "OS: Linux",
    "Use Case: Threat Detection",
    "Tactic: Execution",
    "Data Source: Elastic Defend",
    "Data Source: Elastic Endgame",
    "Data Source: Auditd Manager",
]
timestamp_override = "event.ingested"
type = "eql"
query = '''
process where host.os.type == "linux" and event.type == "start" and event.action in ("exec", "exec_event", "executed", "process_started")
 and (
  (process.name in ("nc", "ncat", "netcat", "nc.openbsd") and 
   process.args == "-U" and process.args : ("/usr/local/*", "/run/*", "/var/run/*")) or
  (process.name == "socat" and 
   process.args == "-" and process.args : ("UNIX-CLIENT:/usr/local/*", "UNIX-CLIENT:/run/*", "UNIX-CLIENT:/var/run/*"))
) and
not process.args == "/var/run/libvirt/libvirt-sock"
'''

[[rule.threat]]
framework = "MITRE ATT&CK"

[[rule.threat.technique]]
id = "T1559"
name = "Inter-Process Communication"
reference = "https://attack.mitre.org/techniques/T1559/"

[rule.threat.tactic]
id = "TA0002"
name = "Execution"
reference = "https://attack.mitre.org/tactics/TA0002/"