Merge PR #5046 from @frack113 - Add `Setup16.EXE Execution With Custo…

…m .Lst File`

new: Setup16.EXE Execution With Custom .Lst File

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Co-authored-by: nasbench <8741929+nasbench@users.noreply.github.com>

rules/windows/process_creation/proc_creation_win_setup16_custom_lst_execution.yml

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