Suspicious Perl Child Process Execution

[rule]
description = """
Detects when Perl executes suspicious child processes on macOS. Perl can be abused by adversaries to execute malicious
commands or scripts.
"""
id = "45681609-ac5b-4151-9014-204590e87e1d"
license = "Elastic License v2"
name = "Suspicious Perl Child Process Execution"
os_list = ["macos"]
version = "1.0.5"

query = '''
process where event.type == "start" and event.action == "exec" and process.parent.name == "perl" and 
 (process.name like~ ("python*", "curl", "nscurl", "osascript", "whoami", "cat", "Terminal") or 
  (process.name in ("sh", "zsh", "bash") and process.args_count == 2 and process.args == "-c" and process.args like ("/Users/*", "/tmp/*", "/private/tmp/*"))) and
    not process.parent.command_line like "perl /Library/TeX/texbin/tlmgr*" and 
    not process.Ext.effective_parent.executable like ("/System/*", "/Applications/Xcode.app/Contents/MacOS/Xcode")
'''

min_endpoint_version = "8.16.0"
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 = "8.16.0"