Luca
70abe43f44
update: Unsigned DLL Loaded by Windows Utility - Add InstallUtil, RegAsm and RegSvcs as additional process and add additional "null" and "empty" filters to cover for non available fields. update: Potential PowerShell Execution Via DLL - Add regsvr32 to increase coverage. --------- Co-authored-by: nasbench <8741929+nasbench@users.noreply.github.com>
54 lines
1.6 KiB
YAML
54 lines
1.6 KiB
YAML
title: Unsigned DLL Loaded by Windows Utility
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id: b5de0c9a-6f19-43e0-af4e-55ad01f550af
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status: experimental
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description: |
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Detects windows utilities loading an unsigned or untrusted DLL.
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Adversaries often abuse those programs to proxy execution of malicious code.
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references:
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- https://www.elastic.co/security-labs/Hunting-for-Suspicious-Windows-Libraries-for-Execution-and-Evasion
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- https://akhere.hashnode.dev/hunting-unsigned-dlls-using-kql
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- https://unit42.paloaltonetworks.com/unsigned-dlls/?web_view=true
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author: Swachchhanda Shrawan Poudel
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date: 2024/02/28
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modified: 2024/03/07
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tags:
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- attack.t1218.011
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- attack.t1218.010
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- attack.defense_evasion
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logsource:
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product: windows
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category: image_load
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detection:
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selection:
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Image|endswith:
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# Note: Add additional utilities that allow the loading of DLLs
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- '\InstallUtil.exe'
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- '\RegAsm.exe'
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- '\RegSvcs.exe'
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- '\regsvr32.exe'
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- '\rundll32.exe'
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filter_main_signed:
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Signed: 'true'
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filter_main_sig_status:
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SignatureStatus:
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- 'errorChaining'
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- 'errorCode_endpoint'
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- 'errorExpired'
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- 'trusted'
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filter_main_signed_null:
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Signed: null
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filter_main_signed_empty:
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Signed:
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- ''
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- '-'
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filter_main_sig_status_null:
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SignatureStatus: null
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filter_main_sig_status_empty:
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SignatureStatus:
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- ''
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- '-'
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condition: selection and not 1 of filter_main_*
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falsepositives:
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- Unknown
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level: medium
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