ScreenConnect Client Installed from an Existing ScreenConnect Session

[rule]
description = """
Identifies an existing ScreenConnect client installing another ScreenConnect ClientSetup package, either via the
ScreenConnect RunFile action or msiexec spawned from a ScreenConnect process. Threat actors have used one ScreenConnect
session to deploy a second client for redundant persistence, or to pivot from a legitimate trial instance to a second
client with attacker-controlled C2.
"""
id = "b887d476-3373-4eed-ac03-23ca994805b6"
license = "Elastic License v2"
name = "ScreenConnect Client Installed from an Existing ScreenConnect Session"
os_list = ["windows"]
reference = ["https://www.huntress.com/blog/phishing-bitb-rmm-attacks"]
version = "1.0.1"

query = '''
process where event.action == "start" and
 (
  (process.name : "ScreenConnect.WindowsClient.exe" and process.args : "RunFile" and process.command_line : "*ScreenConnect.ClientSetup.msi*") or
  
  (process.name : "msiexec.exe" and process.args : ("/i*", "-i*") and process.command_line : "*ScreenConnect.ClientSetup.msi*" and 
   process.parent.name : ("ScreenConnect.WindowsClient.exe", "ScreenConnect.WindowsFileManager.exe"))
 )
'''

min_endpoint_version = "8.10.0"
[[actions]]
action = "kill_process"
field = "process.entity_id"
state = 0
tree = true

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

[[optional_actions]]
action = "rollback"
field = "process.entity_id"
state = 0

[[threat]]
framework = "MITRE ATT&CK"
[[threat.technique]]
id = "T1219"
name = "Remote Access Tools"
reference = "https://attack.mitre.org/techniques/T1219/"


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

[internal]
min_endpoint_version = "8.10.0"