66 lines
2.1 KiB
YAML
66 lines
2.1 KiB
YAML
title: Formbook Process Creation
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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
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to delete the dropper from the AppData Temp folder. We avoid false positives by
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excluding 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: '*del*'
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SELECTION_11:
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CommandLine: '*\Desktop\\*'
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SELECTION_12:
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CommandLine: '*/C*'
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SELECTION_13:
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CommandLine: '*type nul >*'
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SELECTION_14:
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CommandLine: '*\Desktop\\*'
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SELECTION_15:
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CommandLine: '*.exe'
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SELECTION_2:
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ParentCommandLine: C:\Windows\System32\\*
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SELECTION_3:
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ParentCommandLine: C:\Windows\SysWOW64\\*
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SELECTION_4:
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ParentCommandLine: '*.exe'
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SELECTION_5:
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CommandLine: '*C:\Users\\*'
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SELECTION_6:
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CommandLine: '*/c*'
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SELECTION_7:
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CommandLine: '*del*'
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SELECTION_8:
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CommandLine: '*\AppData\Local\Temp\\*'
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SELECTION_9:
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CommandLine: '*/c*'
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condition: (SELECTION_1 and (SELECTION_2 or SELECTION_3) and (SELECTION_4) and
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SELECTION_5 and ((SELECTION_6 and SELECTION_7 and SELECTION_8) or (SELECTION_9
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and SELECTION_10 and SELECTION_11) or (SELECTION_12 and SELECTION_13 and SELECTION_14))
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and SELECTION_15)
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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: 2019/10/31
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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: experimental
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tags:
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- attack.develop_capabilities
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- attack.t1587.001
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yml_filename: win_malware_formbook.yml
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yml_path: /Users/user/Documents/YamatoSecurity/sigma/rules/windows/process_creation
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