Suspicious Execution via setsid and nohup

[rule]
description = """
Detects the execution of setsid and nohup commands with unusual arguments. Attackers may use these commands to establish
persistence on a target system or to execute commands in the background.
"""
id = "18d82674-08d0-408e-801b-468e1b06298f"
license = "Elastic License v2"
name = "Suspicious Execution via setsid and nohup"
os_list = ["linux"]
reference = ["https://www.elastic.co/security-labs/primer-on-persistence-mechanisms"]
version = "1.0.5"

query = '''
process where event.type == "start" and event.action == "exec" and process.name in ("setsid", "nohup") and
process.command_line like~ (
  "*/dev/tcp*", "*/dev/udp/*", "*import*pty*spawn*", "*import*subprocess*call*", "*TCPSocket.new*", "*TCPSocket.open*",
  "*io.popen*", "*os.execute*", "*fsockopen*", "*disown*"
)
'''

min_endpoint_version = "7.15.0"
optional_actions = []
[[actions]]
action = "kill_process"
field = "process.entity_id"
state = 0

[[actions]]
action = "kill_process"
field = "process.parent.entity_id"
state = 0

[[threat]]
framework = "MITRE ATT&CK"
[[threat.technique]]
id = "T1059"
name = "Command and Scripting Interpreter"
reference = "https://attack.mitre.org/techniques/T1059/"
[[threat.technique.subtechnique]]
id = "T1059.004"
name = "Unix Shell"
reference = "https://attack.mitre.org/techniques/T1059/004/"



[threat.tactic]
id = "TA0002"
name = "Execution"
reference = "https://attack.mitre.org/tactics/TA0002/"
[[threat]]
framework = "MITRE ATT&CK"
[[threat.technique]]
id = "T1071"
name = "Application Layer Protocol"
reference = "https://attack.mitre.org/techniques/T1071/"


[threat.tactic]
id = "TA0011"
name = "Command and Control"
reference = "https://attack.mitre.org/tactics/TA0011/"

[internal]
min_endpoint_version = "7.15.0"