Suspicious Execution via Microsoft OfficeCmd URL Handler

[rule]
description = """
Identifies Microsoft Local Bridge executable with suspicious arguments that may indicate an attempt to exploit Microsoft
ms-officecmd URL handler via an argument injection vulnerability.
"""
id = "12e6ac2e-a429-4f54-abb2-eaa5713a4d06"
license = "Elastic License v2"
name = "Suspicious Execution via Microsoft OfficeCmd URL Handler"
os_list = ["windows"]
reference = ["https://positive.security/blog/ms-officecmd-rce"]
version = "1.0.27"

query = '''
process where event.action == "start" and
 (process.name : "LocalBridge.exe" and process.command_line : "*ms-officecmd*LaunchOfficeAppForResult*--gpu-launcher*") or
 (process.parent.name : "LocalBridge.exe" and process.parent.command_line : "*ms-officecmd*LaunchOfficeAppForResult*--gpu-launcher*") or
 /* generic condition to capture abuses of Electron Apps --gpu-launcher switch for proxy execution */
 (process.parent.command_line : "*--disable-gpu-sandbox*--gpu-launcher=*" and not process.parent.name : "LocalBridge.exe")
'''

min_endpoint_version = "7.15.0"
optional_actions = []
[[actions]]
action = "kill_process"
field = "process.entity_id"
state = 0

[[threat]]
framework = "MITRE ATT&CK"
[[threat.technique]]
id = "T1189"
name = "Drive-by Compromise"
reference = "https://attack.mitre.org/techniques/T1189/"


[threat.tactic]
id = "TA0001"
name = "Initial Access"
reference = "https://attack.mitre.org/tactics/TA0001/"

[internal]
min_endpoint_version = "7.15.0"