Potential WebShell via ScreenConnect Server

[rule]
description = """
Identifies suspicious processes being spawned by the ScreenConnect server process (ScreenConnect.Service.exe). This
activity may indicate exploitation activity or access to an existing web shell backdoor.
"""
id = "10265eab-b3b0-4ecb-bed2-5b4f4a5a4e28"
license = "Elastic License v2"
name = "Potential WebShell via ScreenConnect Server"
os_list = ["windows"]
version = "1.0.2"

query = '''
process where event.action == "start" and
  process.parent.name : "ScreenConnect.Service.exe" and
  process.name : ("cmd.exe", "powershell.exe", "pwsh.exe", "powershell_ise.exe", "csc.exe") and
  not process.executable : "?:\\Program Files (x86)\\ScreenConnect\\bin\\roslyn\\csc.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 = "T1190"
name = "Exploit Public-Facing Application"
reference = "https://attack.mitre.org/techniques/T1190/"


[threat.tactic]
id = "TA0001"
name = "Initial Access"
reference = "https://attack.mitre.org/tactics/TA0001/"
[[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 = "T1059.001"
name = "PowerShell"
reference = "https://attack.mitre.org/techniques/T1059/001/"

[[threat.technique.subtechnique]]
id = "T1059.003"
name = "Windows Command Shell"
reference = "https://attack.mitre.org/techniques/T1059/003/"



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

[internal]
min_endpoint_version = "7.15.0"