AWL Bypass with Winrm.vbs and Malicious WsmPty.xsl/WsmTxt.xsl

 1title: AWL Bypass with Winrm.vbs and Malicious WsmPty.xsl/WsmTxt.xsl
 2id: 074e0ded-6ced-4ebd-8b4d-53f55908119d
 3status: test
 4description: Detects execution of attacker-controlled WsmPty.xsl or WsmTxt.xsl via winrm.vbs and copied cscript.exe (can be renamed)
 5references:
 6    - https://posts.specterops.io/application-whitelisting-bypass-and-arbitrary-unsigned-code-execution-technique-in-winrm-vbs-c8c24fb40404
 7author: Julia Fomina, oscd.community
 8date: 2020/10/06
 9modified: 2022/10/09
10tags:
11    - attack.defense_evasion
12    - attack.t1216
13logsource:
14    category: process_creation
15    product: windows
16detection:
17    contains_format_pretty_arg:
18        CommandLine|contains:
19            - 'format:pretty'
20            - 'format:"pretty"'
21            - 'format:"text"'
22            - 'format:text'
23    image_from_system_folder:
24        Image|startswith:
25            - 'C:\Windows\System32\'
26            - 'C:\Windows\SysWOW64\'
27    contains_winrm:
28        CommandLine|contains: 'winrm'
29    condition: contains_winrm and (contains_format_pretty_arg and not image_from_system_folder)
30falsepositives:
31    - Unlikely
32level: medium