Nasreddine Bencherchali
79 lines
3.1 KiB
YAML
79 lines
3.1 KiB
YAML
title: Potential NT API Stub Patching
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id: b916cba1-b38a-42da-9223-17114d846fd6
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status: experimental
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description: Detects potential NT API stub patching as seen used by the project PatchingAPI
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references:
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- https://github.com/D1rkMtr/UnhookingPatch
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- https://twitter.com/D1rkMtr/status/1611471891193298944?s=20
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author: frack113
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date: 2023/01/07
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modified: 2023/01/25
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tags:
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- attack.defense_evasion
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- attack.t1562.002
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logsource:
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category: process_access
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product: windows
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detection:
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selection:
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GrantedAccess: '0x1FFFFF'
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CallTrace|startswith: 'C:\Windows\SYSTEM32\ntdll.dll+'
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CallTrace|contains: '|UNKNOWN('
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CallTrace|endswith: ')'
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filter_generic:
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# To avoid FP with installed applications. This filter assumes that if an application is located here. The attacker has already achieved admin rights
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- SourceImage|startswith:
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- 'C:\Program Files\'
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- 'C:\Program Files (x86)\'
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- 'C:\Windows\System32\'
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- 'C:\Windows\SysWOW64\'
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- TargetImage|startswith:
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- 'C:\Program Files\'
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- 'C:\Program Files (x86)\'
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- 'C:\Windows\System32\'
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- 'C:\Windows\SysWOW64\'
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filter_thor:
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SourceImage|startswith: 'C:\Windows\Temp\asgard2-agent\'
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SourceImage|endswith: '\thor64.exe'
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filter_githubdesktop:
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SourceImage|startswith: 'C:\Users\'
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SourceImage|contains: '\AppData\Local\GitHubDesktop\app-'
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SourceImage|endswith:
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- '\GitHubDesktop.exe'
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- '\resources\app\git\usr\bin\sh.exe'
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TargetImage|startswith: 'C:\Users\'
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TargetImage|contains: '\AppData\Local\GitHubDesktop\app-'
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filter_dotnet:
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SourceImage|startswith:
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- 'C:\Windows\Microsoft.NET\Framework\v'
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- 'C:\Windows\Microsoft.NET\Framework64\v'
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SourceImage|endswith: '\NGenTask.exe'
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TargetImage|startswith:
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- 'C:\Windows\Microsoft.NET\Framework\v'
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- 'C:\Windows\Microsoft.NET\Framework64\v'
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filter_taskhost:
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SourceImage:
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- 'C:\WINDOWS\system32\taskhostw.exe'
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- 'C:\Windows\system32\taskhost.exe'
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TargetImage|startswith:
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- 'C:\Windows\Microsoft.NET\Framework\v'
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- 'C:\Windows\Microsoft.NET\Framework64\v'
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TargetImage|endswith: '\NGenTask.exe'
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filter_teams_to_update:
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SourceImage|startswith: 'C:\Users\'
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SourceImage|endswith: '\AppData\Local\Microsoft\Teams\stage\Teams.exe'
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TargetImage|startswith: 'C:\Users\'
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TargetImage|endswith: '\AppData\Local\Microsoft\Teams\Update.exe'
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filter_teams_update_regsvr32:
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SourceImage|startswith: 'C:\Users\'
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SourceImage|endswith: '\AppData\Local\Microsoft\Teams\Update.exe'
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TargetImage: 'C:\WINDOWS\SysWOW64\regsvr32.exe'
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filter_teams_update_to_teams:
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SourceImage|startswith: 'C:\Users\'
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SourceImage|endswith: '\AppData\Local\Microsoft\Teams\Update.exe'
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TargetImage|endswith: '\AppData\Local\Microsoft\Teams\stage\Teams.exe'
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condition: selection and not 1 of filter_*
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falsepositives:
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- Unknown
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level: medium
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