60 lines
1.8 KiB
YAML
60 lines
1.8 KiB
YAML
title: Suspicious Serv-U Process Pattern
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author: Florian Roth
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date: 2021/07/14
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description: Detects a suspicious process pattern which could be a sign of an exploited
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Serv-U service
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detection:
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SELECTION_1:
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EventID: 1
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SELECTION_10:
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Image: '*\regsvr32.exe'
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SELECTION_11:
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Image: '*\wmic.exe'
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SELECTION_12:
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Image: '*\mshta.exe'
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SELECTION_13:
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Image: '*\rundll32.exe'
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SELECTION_14:
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Image: '*\msiexec.exe'
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SELECTION_15:
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Image: '*\forfiles.exe'
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SELECTION_16:
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Image: '*\scriptrunner.exe'
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SELECTION_2:
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ParentImage: '*\Serv-U.exe'
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SELECTION_3:
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Image: '*\cmd.exe'
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SELECTION_4:
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Image: '*\powershell.exe'
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SELECTION_5:
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Image: '*\wscript.exe'
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SELECTION_6:
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Image: '*\cscript.exe'
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SELECTION_7:
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Image: '*\sh.exe'
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SELECTION_8:
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Image: '*\bash.exe'
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SELECTION_9:
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Image: '*\schtasks.exe'
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condition: (SELECTION_1 and SELECTION_2 and (SELECTION_3 or SELECTION_4 or SELECTION_5
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or SELECTION_6 or SELECTION_7 or SELECTION_8 or SELECTION_9 or SELECTION_10
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or SELECTION_11 or SELECTION_12 or SELECTION_13 or SELECTION_14 or SELECTION_15
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or SELECTION_16))
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falsepositives:
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- Legitimate uses in which users or programs use the SSH service of Serv-U for remote
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command execution
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id: 58f4ea09-0fc2-4520-ba18-b85c540b0eaf
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level: critical
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logsource:
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category: process_creation
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product: windows
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references:
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- https://www.microsoft.com/security/blog/2021/07/13/microsoft-discovers-threat-actor-targeting-solarwinds-serv-u-software-with-0-day-exploit/
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status: experimental
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tags:
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- attack.credential_access
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- cve.2021.35211
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yml_filename: win_susp_servu_process_pattern.yml
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yml_path: /Users/user/Documents/YamatoSecurity/sigma/rules/windows/process_creation
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