title: Unsigned DLL Loaded by Windows Utility
id: b5de0c9a-6f19-43e0-af4e-55ad01f550af
status: test
description: |
    Detects windows utilities loading an unsigned or untrusted DLL.
    Adversaries often abuse those programs to proxy execution of malicious code.
references:
    - https://www.elastic.co/security-labs/Hunting-for-Suspicious-Windows-Libraries-for-Execution-and-Evasion
    - https://akhere.hashnode.dev/hunting-unsigned-dlls-using-kql
    - https://unit42.paloaltonetworks.com/unsigned-dlls/?web_view=true
author: Swachchhanda Shrawan Poudel
date: 2024-02-28
modified: 2024-03-07
tags:
    - attack.t1218.011
    - attack.t1218.010
    - attack.defense-evasion
logsource:
    product: windows
    category: image_load
detection:
    selection:
        Image|endswith:
            # Note: Add additional utilities that allow the loading of DLLs
            - '\InstallUtil.exe'
            - '\RegAsm.exe'
            - '\RegSvcs.exe'
            - '\regsvr32.exe'
            - '\rundll32.exe'
    filter_main_signed:
        Signed: 'true'
    filter_main_sig_status:
        SignatureStatus:
            - 'errorChaining'
            - 'errorCode_endpoint'
            - 'errorExpired'
            - 'trusted'
    filter_main_signed_null:
        Signed: null
    filter_main_signed_empty:
        Signed:
            - ''
            - '-'
    filter_main_sig_status_null:
        SignatureStatus: null
    filter_main_sig_status_empty:
        SignatureStatus:
            - ''
            - '-'
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Unknown
level: medium