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29 lines
1.2 KiB
YAML
29 lines
1.2 KiB
YAML
title: Formbook Process Creation
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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 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
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date: 2019/09/30
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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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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: 'C:\Windows\System32\\*.exe'
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CommandLine:
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- '*\cmd.exe /c del "C:\Users\\*\AppData\Local\Temp\\*.exe'
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- '*\cmd.exe /c del "C:\Users\\*\Desktop\\*.exe'
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condition: selection
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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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