Suspicious Audio Unit Plug-in File Access

[rule]
description = """
Detects when an audio component or plug-in is created or accessed by a suspicious process. Applications such as
GarageBand 10, Logic Pro X, Audacity, etc., use audio unit plug-ins to create sound effects and virtual instruments.
Software developers and sound engineers can create either audio components or virtual studio technology (VST) plug-ins.
Threat actors can also create audio components or plug-ins and load them to execute unsigned code via the native auval
or auvaltool binaries.
"""
id = "ced79436-2518-4aac-8939-c775b4b4ccd5"
license = "Elastic License v2"
name = "Suspicious Audio Unit Plug-in File Access"
os_list = ["macos"]
reference = ["https://posts.specterops.io/audio-unit-plug-ins-896d3434a882"]
version = "1.0.11"

query = '''
file where event.action != "deletion" and process.name like~ ("curl", "nscurl", "osascript", "wget", "python*") and
 file.extension in~ ("component", "audiocomp") and
 file.path like~ ("/Library/Audio/Plug-ins/Components/*", "/Users/*/Library/Audio/Plug-ins/Components/*")
'''

min_endpoint_version = "8.10.2"
optional_actions = []
[[actions]]
action = "kill_process"
field = "Effective_process.executable"
state = 0

[[actions]]
action = "kill_process"
field = "process.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 = "8.10.2"