[rule]
description = """
Detects execution of a Windows command shell spawned as a result of connecting to or from a Netcat listener. Attackers
often use Netcat to run commands on remote systems.
"""
id = "2e80dd26-3966-4a16-9fad-ac643b5dd66e"
license = "Elastic License v2"
name = "Potential Shell Execution via NetCat"
os_list = ["windows"]
reference = ["https://github.coventry.ac.uk/pages/aa9863/5063CEM/3_LinuxAndShells/Netcat/"]
version = "1.0.2"
query = '''
process where event.action == "start" and
process.name : ("cmd.exe", "powershell.exe") and process.parent.args : "-e" and process.args_count == 1 and
(
(process.parent.args_count == 5 and process.parent.command_line regex~ """.*[0-9]{1,3}(\.[0-9]{1,3}){3}.*""") or
(process.parent.args : "-*l*" and process.parent.args : "-*p*" and process.parent.args : ("cmd.exe", "powershell.exe") and
not process.parent.name : ("cmd.exe", "powershell.exe") and process.parent.args_count <= 5)
)
'''
min_endpoint_version = "8.10.0"
optional_actions = []
[[actions]]
action = "kill_process"
field = "process.parent.entity_id"
state = 0
tree = true
[[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 = "T1059.001"
name = "PowerShell"
reference = "https://attack.mitre.org/techniques/T1059/001/"
[[threat.technique.subtechnique]]
id = "T1059.003"
name = "Windows Command Shell"
reference = "https://attack.mitre.org/techniques/T1059/003/"
[threat.tactic]
id = "TA0002"
name = "Execution"
reference = "https://attack.mitre.org/tactics/TA0002/"
[internal]
min_endpoint_version = "8.10.0"