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52 lines
1.8 KiB
YAML
52 lines
1.8 KiB
YAML
title: Formbook Process Creation
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id: 032f5fb3-d959-41a5-9263-4173c802dc2b
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status: experimental
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description: Detects Formbook like process executions that inject code into a set 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 all parent process with command line parameters.
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author: Florian Roth, oscd.community, Jonhnathan Ribeiro
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date: 2019/09/30
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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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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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# Parent command line should not contain a space value
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# This avoids false positives not caused by process injection
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# e.g. wscript.exe /B sysmon-install.vbs
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ParentCommandLine|startswith:
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- 'C:\Windows\System32\'
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- 'C:\Windows\SysWOW64\'
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ParentCommandLine|endswith:
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- '.exe'
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selection2:
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- CommandLine|contains|all:
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- '/c'
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- 'del'
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- 'C:\Users\'
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- '\AppData\Local\Temp\'
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- CommandLine|contains|all:
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- '/c'
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- 'del'
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- 'C:\Users\'
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- '\Desktop\'
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- CommandLine|contains|all:
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- '/C'
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- 'type nul >'
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- 'C:\Users\'
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- '\Desktop\'
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selection3:
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CommandLine|endswith: '.exe'
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condition: selection and selection2 and selection3
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fields:
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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: critical
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