Hidden AppleScript Download via Curl

[rule]
description = """
Detects when Curl or NsCurl download and modify a hidden AppleScript file. Threat actors have been seen downloading a
hidden AppleScript file as a second stage payload in order to facilitate additional post exploitation actions on
compromised systems.
"""
id = "a6ed2e19-67e9-4999-b4a7-499b86cf5784"
license = "Elastic License v2"
name = "Hidden AppleScript Download via Curl"
os_list = ["macos"]
reference = ["https://x.com/moonlock_lab/status/1980683916571996312"]
version = "1.0.1"

query = '''
sequence with maxspan=20s
[process where event.type == "start" and event.action == "exec" and process.name in ("curl", "nscurl")] by process.parent.entity_id
[file where event.action == "modification" and file.name : ".*" and file.extension == "scpt" and process.name in ("curl", "nscurl")] by Effective_process.entity_id
'''

min_endpoint_version = "8.16.0"
optional_actions = []
[[actions]]
action = "kill_process"
field = "Effective_process.entity_id"
state = 1

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

[[threat]]
framework = "MITRE ATT&CK"
[[threat.technique]]
id = "T1564"
name = "Hide Artifacts"
reference = "https://attack.mitre.org/techniques/T1564/"
[[threat.technique.subtechnique]]
id = "T1564.001"
name = "Hidden Files and Directories"
reference = "https://attack.mitre.org/techniques/T1564/001/"



[threat.tactic]
id = "TA0005"
name = "Defense Evasion"
reference = "https://attack.mitre.org/tactics/TA0005/"
[[threat]]
framework = "MITRE ATT&CK"
[[threat.technique]]
id = "T1105"
name = "Ingress Tool Transfer"
reference = "https://attack.mitre.org/techniques/T1105/"


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

[internal]
min_endpoint_version = "8.16.0"