Potential fodhelper UAC Bypass Attempt (Windows Event Log)

id: '20217.35898'
title: Potential fodhelper UAC Bypass Attempt
description: 'Adversaries may bypass UAC mechanisms to elevate process privileges
  on system. Windows User Account Control (UAC) allows a program to elevate its privileges
  (tracked as integrity levels ranging from low to high) to perform a task under administrator-level
  permissions, possibly by prompting the user for confirmation. This use case detects
  the creation of registry keys associated with known methods of using fodhelper to
  bypass UAC. Atomic Test #3: T1548.002'
logic_format: Splunk
logic: '`get_endpoint_data` `get_endpoint_data_winevent` (TERM(EventCode=4688) OR
  "<EventID>4688<" OR Type=Process OR TERM(EventCode=4657) OR "<EventID>4657<") "\\Software\\Classes\\ms-settings\\shell\\open\\command"
  | regex process="(?i)ms-settings\x5cshell\x5copen\x5ccommand.+" | table _time, host,
  user, process, process_*, parent_process_* | bin span=1s | stats values(*) as *
  by _time, host '
techniques:
- privilege-escalation:abuse elevation control mechanism:bypass user account control
- defense-evasion:abuse elevation control mechanism:bypass user account control
technique_id:
- T1548.002
data_category:
- Process command-line parameters
- Windows event logs
references:
- https://blog.sygnia.co/breaking-down-casbaneiro-infection-chain-part2?_ga=2.66949422.1638613298.1690290265-1923873697.1682517767
- https://gist.github.com/netbiosX/a114f8822eb20b115e33db55deee6692