sigmahighHunting

Suspicious Unsigned Dbghelp/Dbgcore DLL Loaded

Detects the load of dbghelp/dbgcore DLL (used to make memory dumps) by suspicious processes. Tools like ProcessHacker and some attacker tradecract use MiniDumpWriteDump API found in dbghelp.dll or dbgcore.dll. As an example, SilentTrynity C2 Framework has a module that leverages this API to dump the contents of Lsass.exe and transfer it over the network back to the attacker's machine.

MITRE ATT&CK

T1003.001

credential-access

Detection Query

selection:
  ImageLoaded|endswith:
    - \dbghelp.dll
    - \dbgcore.dll
  Signed: "false"
condition: selection

Author

Perez Diego (@darkquassar), oscd.community, Ecco

Created

2019-10-27

Data Sources

windowsImage Load Events

Platforms

windows

References

Tags

attack.credential-accessattack.t1003.001

Raw Content

title: Suspicious Unsigned Dbghelp/Dbgcore DLL Loaded
id: bdc64095-d59a-42a2-8588-71fd9c9d9abc
related:
    - id: 0e277796-5f23-4e49-a490-483131d4f6e1 # Suspicious Loading
      type: similar
status: test
description: |
    Detects the load of dbghelp/dbgcore DLL (used to make memory dumps) by suspicious processes.
    Tools like ProcessHacker and some attacker tradecract use MiniDumpWriteDump API found in dbghelp.dll or dbgcore.dll.
    As an example, SilentTrynity C2 Framework has a module that leverages this API to dump the contents of Lsass.exe and transfer it over the network back to the attacker's machine.
references:
    - https://learn.microsoft.com/en-us/windows/win32/api/minidumpapiset/nf-minidumpapiset-minidumpwritedump
    - https://www.pinvoke.net/default.aspx/dbghelp/MiniDumpWriteDump.html
    - https://medium.com/@fsx30/bypass-edrs-memory-protection-introduction-to-hooking-2efb21acffd6
author: Perez Diego (@darkquassar), oscd.community, Ecco
date: 2019-10-27
modified: 2022-12-09
tags:
    - attack.credential-access
    - attack.t1003.001
logsource:
    category: image_load
    product: windows
detection:
    selection:
        ImageLoaded|endswith:
            - '\dbghelp.dll'
            - '\dbgcore.dll'
        Signed: 'false'
    condition: selection
falsepositives:
    - Unknown
level: high