MacOS Interactive Shell Spawned via Hidden Process

[rule]
description = """
Detects when a hidden process spawns an interactive shell. Many different types of malware will create and execute
hidden binaries in order to avoid suspicion or detection by a user. Sometimes depending on the implementation a payload
will open an interactive shell on the target system in order to execute post exploitation commands in real time.
"""
id = "8d6b1c6b-fd51-4a56-bc34-ea91f9921651"
license = "Elastic License v2"
name = "MacOS Interactive Shell Spawned via Hidden Process"
os_list = ["macos"]
version = "1.0.5"

query = '''
process where event.type == "start" and event.action == "exec" and (process.name in ("bash", "sh", "zsh", "dash", "csh", "tcsh", "ksh", "tclsh", "fish") or process.name like "tclsh*") and
 process.args == "-i" and process.args_count == 2 and
 process.parent.name like~ ".*"
'''

min_endpoint_version = "8.11.0"
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/"

[internal]
min_endpoint_version = "8.11.0"