Nasreddine Bencherchali
29 lines
825 B
YAML
29 lines
825 B
YAML
title: Fax Service DLL Search Order Hijack
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id: 828af599-4c53-4ed2-ba4a-a9f835c434ea
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status: test
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description: The Fax service attempts to load ualapi.dll, which is non-existent. An attacker can then (side)load their own malicious DLL using this service.
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references:
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- https://windows-internals.com/faxing-your-way-to-system/
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author: NVISO
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date: 2020-05-04
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modified: 2022-06-02
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tags:
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- attack.privilege-escalation
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- attack.persistence
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- attack.execution
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- attack.stealth
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- attack.t1574.001
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logsource:
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category: image_load
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product: windows
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detection:
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selection:
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Image|endswith: '\fxssvc.exe'
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ImageLoaded|endswith: 'ualapi.dll'
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filter:
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ImageLoaded|startswith: 'C:\Windows\WinSxS\'
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condition: selection and not filter
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falsepositives:
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- Unlikely
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level: high
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