Tanaka Zakku
37 lines
1018 B
YAML
37 lines
1018 B
YAML
title: Fax Service DLL Search Order Hijack
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author: NVISO
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date: 2020/05/04
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description: The Fax service attempts to load ualapi.dll, which is non-existent. An
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attacker can then (side)load their own malicious DLL using this service.
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detection:
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SELECTION_1:
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EventID: 7
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SELECTION_2:
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Image: '*fxssvc.exe'
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SELECTION_3:
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ImageLoaded: '*ualapi.dll'
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SELECTION_4:
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ImageLoaded: C:\Windows\WinSxS\\*
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condition: (SELECTION_1 and ((SELECTION_2) and (SELECTION_3)) and not ((SELECTION_4)))
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falsepositives:
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- Unlikely
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id: 828af599-4c53-4ed2-ba4a-a9f835c434ea
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level: high
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logsource:
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category: image_load
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product: windows
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modified: 2020/08/23
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references:
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- https://windows-internals.com/faxing-your-way-to-system/
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status: experimental
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tags:
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- attack.persistence
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- attack.defense_evasion
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- attack.t1073
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- attack.t1038
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- attack.t1574.001
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- attack.t1574.002
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yml_filename: sysmon_susp_fax_dll.yml
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yml_path: /Users/user/Documents/YamatoSecurity/sigma/rules/windows/image_load
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