Added Sigverif.yml

yml/OSBinaries/Sigverif.yml

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+---
+Name: Sigverif.exe
+Description: File Signature Verification utility to verify digital signatures of files
+Author: Moshe Kaplan
+Created: 2021-11-08
+Commands:
+  - Command: sigverif.exe
+    Description: Launch sigverif.exe GUI, click 'Advanced', specify arbitrary executable path as 'log file name', then click 'View Log' to execute the binary.
+    Usecase: Execute arbitrary programs through a trusted Microsoft-signed binary to bypass application whitelisting.
+    Category: Execute
+    Privileges: User
+    MitreID: T1218
+    OperatingSystem: Windows vista, Windows 7, Windows 8, Windows 10, Windows 11
+    Tags:
+      - Execute: EXE
+      - Application: GUI
+Full_Path:
+  - Path: C:\Windows\System32\sigverif.exe
+  - Path: C:\Windows\SysWOW64\sigverif.exe
+Detection:
+  - IOC: sigverif.exe spawning unexpected child processes
+Resources:
+  - Link: https://twitter.com/0gtweet/status/1457676633809330184
+  - Link: https://www.hexacorn.com/blog/2018/04/27/i-shot-the-sigverif-exe-the-gui-based-lolbin/
+Acknowledgement:
+  - Person: Grzegorz Tworek
+    Handle: '@0gtweet'
+  - Person: Adam
+    Handle: '@Hexacorn'