Nasreddine Bencherchali
309c2dee7f
fix: Bad Opsec Defaults Sacrificial Processes With Improper Arguments - Enhance filter to account for an FP found with MS edge fix: Files With System Process Name In Unsuspected Locations - Enhance filter to cover other folder variation for windows recovery fix: Portable Gpg.EXE Execution - Add new legitimate location for GNuGpg fix: Suspicious WmiPrvSE Child Process - Add a filter for msiexec image used to install new MSI packages via WMI process update: ISO Image Mounted - Update title and add new filter update: Potential NT API Stub Patching - Enhance the selection coverage by removing the "C:" prefix to cover other installation possibilities update: Remote Thread Creation Via PowerShell - Update selection to use endswith modifier for better coverage update: Remote Thread Creation Via PowerShell In Potentially Suspicious Target - Update title and add a "regsvr32" as a new additional process to increase coverage update: Suspicious Whoami.EXE Execution - Enhance the selection by using a * wildcard to account for the order and avoid FPs update: WMI Module Loaded By Non Uncommon Process - Enhance selection by making the System folders filter use a "contains" instead of an exact match --------- Co-authored-by: phantinuss <79651203+phantinuss@users.noreply.github.com>
78 lines
3.0 KiB
YAML
78 lines
3.0 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: 2023/11/09
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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_main_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|contains:
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- ':\Program Files\'
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- ':\Program Files (x86)\'
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- ':\Windows\System32\'
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- ':\Windows\SysWOW64\'
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- TargetImage|contains:
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- ':\Program Files\'
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- ':\Program Files (x86)\'
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- ':\Windows\System32\'
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- ':\Windows\SysWOW64\'
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filter_optional_thor:
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SourceImage|endswith:
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- '\thor.exe'
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- '\thor64.exe'
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filter_optional_githubdesktop:
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SourceImage|contains|all:
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- ':\Users\'
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- '\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|contains|all:
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- ':\Users\'
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- '\AppData\Local\GitHubDesktop\app-'
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filter_main_dotnet:
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SourceImage|contains:
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- ':\Windows\Microsoft.NET\Framework\v'
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- ':\Windows\Microsoft.NET\Framework64\v'
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SourceImage|endswith: '\NGenTask.exe'
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TargetImage|contains:
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- ':\Windows\Microsoft.NET\Framework\v'
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- ':\Windows\Microsoft.NET\Framework64\v'
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filter_main_taskhost:
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SourceImage|contains:
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- ':\WINDOWS\system32\taskhostw.exe'
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- ':\Windows\system32\taskhost.exe'
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TargetImage|contains:
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- ':\Windows\Microsoft.NET\Framework\v'
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- ':\Windows\Microsoft.NET\Framework64\v'
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TargetImage|endswith: '\NGenTask.exe'
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filter_optional_teams_to_update:
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SourceImage|endswith: '\AppData\Local\Microsoft\Teams\stage\Teams.exe'
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TargetImage|endswith: '\AppData\Local\Microsoft\Teams\Update.exe'
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filter_optional_teams_update_regsvr32:
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SourceImage|endswith: '\AppData\Local\Microsoft\Teams\Update.exe'
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TargetImage|endswith: ':\WINDOWS\SysWOW64\regsvr32.exe'
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filter_optional_teams_update_to_teams:
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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_main_* and not 1 of filter_optional_*
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falsepositives:
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- Unknown
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level: medium
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