Nasreddine Bencherchali
68 lines
2.7 KiB
YAML
68 lines
2.7 KiB
YAML
title: Conhost Parent Process Executions
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id: 7dc2dedd-7603-461a-bc13-15803d132355
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status: experimental
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description: Detects the conhost execution as parent process. Can be used to evaded defense mechanism.
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references:
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- http://www.hexacorn.com/blog/2020/05/25/how-to-con-your-host/
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author: omkar72
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date: 2020/10/25
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modified: 2022/12/07
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tags:
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- attack.defense_evasion
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- attack.t1202
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logsource:
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category: process_creation
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product: windows
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detection:
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selection:
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ParentImage|endswith: '\conhost.exe'
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filter_provider:
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Provider_Name: 'SystemTraceProvider-Process' # FPs with Aurora
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# Note that some of these git events occure because of a spoofed parent image
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filter_git:
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# Example FP:
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# ParentCommandLine: "C:\Program Files\Git\cmd\git.exe" show --textconv :path/to/file
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# ParentCommandLine: "C:\Program Files\Git\cmd\git.exe" cat-file -s 4ca60c8a054f7eaa05f0438a8292762f2015d228
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Provider_Name: 'Microsoft-Windows-Kernel-Process'
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Image|endswith: '\git.exe'
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ParentCommandLine|contains:
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- ' show --textconv '
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- ' cat-file -s '
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filter_git_show:
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# Example FP:
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# GrandparentCommandLine: git.exe cat-file -s 4ca60c8a054f7eaa05f0438a8292762f2015d258
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# ParentCommandLine: \??\C:\WINDOWS\system32\conhost.exe 0x4
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# ParentImage: C:\Windows\System32\conhost.exe
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# CommandLine: git.exe show --textconv :path/to/file
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ParentCommandLine|contains: 'C:\WINDOWS\system32\conhost.exe 0x4'
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CommandLine|contains:
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- ' show --textconv '
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- ' cat-file -s '
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filter_image_conhost:
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# Example FP:
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# ParentCommandLine: "C:\Program Files\Git\cmd\git.exe" cat-file -s 4ca60c8a054f7eaa05f0438a8292762f2015d228
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Provider_Name: 'Microsoft-Windows-Kernel-Process'
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ParentCommandLine|contains:
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- ' cat-file -s '
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- 'show --textconv'
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Image: 'C:\Windows\System32\conhost.exe'
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filter_image_conhost2:
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ParentCommandLine:
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# The "?" needs to be escaped as they considered special characters in SIGMA (https://github.com/SigmaHQ/sigma-specification)
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- '\\\?\?\\C:\\WINDOWS\\system32\\conhost.exe 0x4'
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- '\\\?\?\\C:\\WINDOWS\\system32\\conhost.exe 0xffffffff -ForceV1'
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Image: 'C:\Windows\System32\conhost.exe'
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filter_image_git:
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ParentCommandLine:
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- \\\?\?\\C:\\WINDOWS\\system32\\conhost.exe 0xffffffff -ForceV1'
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- \\\?\?\\C:\\WINDOWS\\system32\\conhost.exe 0x4'
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Image: 'C:\Program Files\Git\mingw64\bin\git.exe'
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condition: selection and not 1 of filter_*
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fields:
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- Image
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- CommandLine
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- ParentCommandLine
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falsepositives:
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- Unknown
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level: medium
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