UAC Bypass via Hijacking WinMgmt MMC

[rule]
description = """
Identifies attempts to bypass User Account Control by sideloading a rouge ATL.dll from unusual folder into MMC.
Attackers may attempt to hijack DLL search order and stealthily execute code with elevated permissions.
"""
id = "0723b937-2ca6-4fda-9da6-3de0026f4802"
license = "Elastic License v2"
name = "UAC Bypass via Hijacking WinMgmt MMC"
os_list = ["windows"]
reference = ["https://github.com/azAgarampur/byeintegrity9-uac"]
version = "1.0.17"

query = '''
sequence by process.entity_id with maxspan=1m
  [process where event.action == "start" and
   process.name : "mmc.exe" and process.command_line : "*WmiMgmt.msc*"]
  [library where
   dll.path : "?:\\Windows\\System32\\wbem\\ATL.dll" and
   not (dll.code_signature.subject_name : "Microsoft *" and dll.code_signature.trusted == true)]
'''

min_endpoint_version = "7.16.0"
[[actions]]
action = "kill_process"
field = "process.entity_id"
state = 1

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

[[optional_actions]]
action = "rollback"
field = "process.entity_id"
state = 1

[[threat]]
framework = "MITRE ATT&CK"
[[threat.technique]]
id = "T1548"
name = "Abuse Elevation Control Mechanism"
reference = "https://attack.mitre.org/techniques/T1548/"
[[threat.technique.subtechnique]]
id = "T1548.002"
name = "Bypass User Account Control"
reference = "https://attack.mitre.org/techniques/T1548/002/"



[threat.tactic]
id = "TA0004"
name = "Privilege Escalation"
reference = "https://attack.mitre.org/tactics/TA0004/"
[[threat]]
framework = "MITRE ATT&CK"
[[threat.technique]]
id = "T1574"
name = "Hijack Execution Flow"
reference = "https://attack.mitre.org/techniques/T1574/"
[[threat.technique.subtechnique]]
id = "T1574.001"
name = "DLL"
reference = "https://attack.mitre.org/techniques/T1574/001/"



[threat.tactic]
id = "TA0005"
name = "Defense Evasion"
reference = "https://attack.mitre.org/tactics/TA0005/"

[internal]
min_endpoint_version = "7.16.0"