Curl Hidden Binary Modification via Osascript

[rule]
description = """
Detects osascript spawning curl followed by creation of hidden binary files with Mach-O headers within 30 seconds. This
indicates malicious AppleScript workflows downloading and staging executable payloads.
"""
id = "3c3aaa63-d213-486f-b157-e4b1a45d9913"
license = "Elastic License v2"
name = "Curl Hidden Binary Modification via Osascript"
os_list = ["macos"]
version = "1.0.3"

query = '''
sequence by process.entity_id with maxspan=30s
[process where event.type == "start" and event.action == "exec" and process.name == "curl" and process.parent.name == "osascript"]
[file where event.action == "modification" and file.Ext.header_bytes like~ ("cffaedfe*", "cafebabe*") and file.name like~ ".*"]
'''

min_endpoint_version = "8.16.0"
optional_actions = []
[[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 = "T1059.002"
name = "AppleScript"
reference = "https://attack.mitre.org/techniques/T1059/002/"



[threat.tactic]
id = "TA0002"
name = "Execution"
reference = "https://attack.mitre.org/tactics/TA0002/"
[[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"