Createdump.exe

Microsoft .NET Runtime Crash Dump Generator (included in .NET Core)

Paths

• C:\Program Files\dotnet\shared\Microsoft.NETCore.App\<version>\createdump.exe
• C:\Program Files (x86)\dotnet\shared\Microsoft.NETCore.App\<version>\createdump.exe
• C:\Program Files\Microsoft Visual Studio\<version>\Community\dotnet\runtime\shared\Microsoft.NETCore.App\6.0.0\createdump.exe
• C:\Program Files (x86)\Microsoft Visual Studio\<version>\Community\dotnet\runtime\shared\Microsoft.NETCore.App\6.0.0\createdump.exe

Commands

Dump

Dump process by PID and create a minidump file. If "-f dump.dmp" is not specified, the file is created as '%TEMP%\dump.%p.dmp' where %p is the PID of the target process.

Use case: Dump process memory contents using PID.

Privileges: SYSTEM

createdump.exe -n -f {PATH:.dmp} {PID}

Detection

• Sigma: https://github.com/SigmaHQ/sigma/blob/19396788dbedc57249a46efed2bb1927abc376d4/rules/windows/process_creation/proc_creation_win_proc_dump_createdump.yml
• Sigma: https://github.com/SigmaHQ/sigma/blob/683b63f8184b93c9564c4310d10c571cbe367e1e/rules/windows/process_creation/proc_creation_win_renamed_createdump.yml
• IOC: createdump.exe process with a command line containing the lsass.exe process id

Resources

• https://twitter.com/bopin2020/status/1366400799199272960
• https://docs.microsoft.com/en-us/troubleshoot/developer/webapps/aspnetcore/practice-troubleshoot-linux/lab-1-3-capture-core-crash-dumps