Setup16.EXE Execution With Custom .Lst File

 1title: Setup16.EXE Execution With Custom .Lst File
 2id: 99c8be4f-3087-4f9f-9c24-8c7e257b442e
 3status: experimental
 4description: |
 5    Detects the execution of "Setup16.EXE" and old installation utility with a custom ".lst" file.
 6    These ".lst" file can contain references to external program that "Setup16.EXE" will execute.
 7    Attackers and adversaries might leverage this as a living of the land utility.    
 8references:
 9    - https://www.hexacorn.com/blog/2024/10/12/the-sweet16-the-oldbin-lolbin-called-setup16-exe/
10author: frack113
11date: 2024-12-01
12tags:
13    - attack.defense-evasion
14    - attack.t1574.005
15logsource:
16    category: process_creation
17    product: windows
18detection:
19    selection:
20        ParentImage: 'C:\Windows\SysWOW64\setup16.exe'
21        ParentCommandLine|contains: ' -m '
22    filter_optional_valid_path:
23        Image|startswith: 'C:\~MSSETUP.T\'
24    condition: selection and not 1 of filter_optional_*
25falsepositives:
26    - On modern Windows system, the "Setup16" utility is practically never used, hence false positive should be very rare.
27level: medium