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48 lines
1.5 KiB
YAML
48 lines
1.5 KiB
YAML
action: global
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title: AWL Bypass with Winrm.vbs and Malicious WsmPty.xsl/WsmTxt.xsl
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id: 074e0ded-6ced-4ebd-8b4d-53f55908119d
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description: Detects execution of attacker-controlled WsmPty.xsl or WsmTxt.xsl via winrm.vbs and copied cscript.exe (can be renamed)
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status: experimental
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references:
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- https://posts.specterops.io/application-whitelisting-bypass-and-arbitrary-unsigned-code-execution-technique-in-winrm-vbs-c8c24fb40404
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author: Julia Fomina, oscd.community
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date: 2020/10/06
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tags:
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- attack.defense_evasion
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- attack.t1216
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level: medium
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falsepositives:
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- Unlikely
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---
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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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contains_format_pretty_arg:
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CommandLine|contains:
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- 'format:pretty'
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- 'format:"pretty"'
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- 'format:"text"'
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- 'format:text'
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image_from_system_folder:
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Image|startswith:
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- 'C:\Windows\System32\'
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- 'C:\Windows\SysWOW64\'
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contains_winrm:
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CommandLine|contains: 'winrm'
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condition: contains_winrm and (contains_format_pretty_arg and not image_from_system_folder)
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---
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logsource:
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product: windows
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category: file_event
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detection:
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system_files:
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TargetFilename|endswith:
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- 'WsmPty.xsl'
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- 'WsmTxt.xsl'
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in_system_folder:
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TargetFilename|startswith:
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- 'C:\Windows\System32\'
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- 'C:\Windows\SysWOW64\'
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condition: system_files and not in_system_folder
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