Detectionhighexperimental

Suspicious Loading of Dbgcore/Dbghelp DLLs from Uncommon Location

Detects loading of dbgcore.dll or dbghelp.dll from uncommon locations such as user directories. These DLLs contain the MiniDumpWriteDump function, which can be abused for credential dumping purposes or in some cases for evading EDR/AV detection by suspending processes.

Convert In Phoenix Studio

Open this Sigma rule in the converter with the YAML preloaded and ready for backend selection.

Launch
Swachchhanda Shrawan Poudel (Nextron Systems)Created Thu Nov 27Updated Fri Jan 09416bc4a2-7217-4519-8dc7-c3271817f1d5windows
Log Source
WindowsImage Load (DLL)
ProductWindows← raw: windows
CategoryImage Load (DLL)← raw: image_load
Detection Logic
Detection Logic2 selectors
detection:
    selection_img:
        Image|contains:
            - ':\Perflogs\'
            - ':\Temp\'
            - ':\Users\Public\'
            - '\$Recycle.Bin\'
            - '\Contacts\'
            # - '\Desktop\'
            - '\Documents\'
            # - '\Downloads\'
            - '\Favorites\'
            - '\Favourites\'
            - '\inetpub\wwwroot\'
            - '\Music\'
            - '\Pictures\'
            - '\Start Menu\Programs\Startup\'
            - '\Users\Default\'
            - '\Videos\'
            #  - '\AppData\Local\Temp\' some installers may load from here
    selection_dll:
        ImageLoaded|endswith:
            - '\dbgcore.dll'
            - '\dbghelp.dll'
    condition: all of selection_*
False Positives
Unknown

False positive likelihood has not been assessed. Additional context may be needed during triage.

Testing & Validation

Regression Tests

by Swachchhanda Shrawan Poudel (Nextron Systems)
Positive Detection Testevtx

Microsoft-Windows-Sysmon