65 lines
1.9 KiB
YAML
65 lines
1.9 KiB
YAML
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title: Formbook Process Creation
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ruletype: Sigma
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author: Florian Roth, oscd.community, Jonhnathan Ribeiro
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date: 2019/09/30
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description: Detects Formbook like process executions that inject code into a set
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of files in the System32 folder, which executes a special command command line to
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delete the dropper from the AppData Temp folder. We avoid false positives by excluding
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all parent process with command line parameters.
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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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CommandLine: '*\Desktop\\*'
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SELECTION_11:
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CommandLine: '*/C*'
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SELECTION_12:
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CommandLine: '*type nul >*'
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SELECTION_13:
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CommandLine: '*\Desktop\\*'
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SELECTION_14:
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CommandLine: '*.exe'
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SELECTION_2:
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ParentCommandLine:
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- C:\Windows\System32\\*
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- C:\Windows\SysWOW64\\*
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SELECTION_3:
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ParentCommandLine:
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- '*.exe'
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SELECTION_4:
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CommandLine: '*C:\Users\\*'
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SELECTION_5:
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CommandLine: '*/c*'
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SELECTION_6:
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CommandLine: '*del*'
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SELECTION_7:
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CommandLine: '*\AppData\Local\Temp\\*'
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SELECTION_8:
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CommandLine: '*/c*'
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SELECTION_9:
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CommandLine: '*del*'
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condition: (SELECTION_1 and SELECTION_2 and SELECTION_3 and SELECTION_4 and ((SELECTION_5
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and SELECTION_6 and SELECTION_7) or (SELECTION_8 and SELECTION_9 and SELECTION_10)
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or (SELECTION_11 and SELECTION_12 and SELECTION_13)) and SELECTION_14)
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falsepositives:
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- Unknown
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fields:
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- CommandLine
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- ParentCommandLine
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id: 032f5fb3-d959-41a5-9263-4173c802dc2b
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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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modified: 2021/11/27
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references:
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- https://inquest.net/blog/2018/06/22/a-look-at-formbook-stealer
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- https://app.any.run/tasks/388d5802-aa48-4826-b069-250420504758/
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- https://app.any.run/tasks/8e22486b-5edc-4cef-821c-373e945f296c/
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- https://app.any.run/tasks/62bb01ae-25a4-4180-b278-8e464a90b8d7/
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status: test
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tags:
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- attack.develop_capabilities
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- attack.t1587.001
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