Create Unregmp2.yml

Added a new lolbin, unregmp2.exe, used for proxying execution.

yml/OSBinaries/Unregmp2.yml

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+---
+Name: Unregmp2.exe
+Description: Microsoft Windows Media Player Setup Utility
+Author: 'Wade Hickey'
+Created: 2021-12-06
+Commands:
+  - Command: rmdir %temp%\lolbin /s /q 2>nul & mkdir "%temp%\lolbin\Windows Media Player" & copy C:\Windows\System32\calc.exe "%temp%\lolbin\Windows Media Player\wmpnscfg.exe" >nul && cmd /V /C "set "ProgramW6432=%temp%\lolbin" && unregmp2.exe /HideWMP"
+    Description: Allows an attacker to copy a target binary to a controlled directory and modify the 'ProgramW6432' environment variable to point to that controlled directory, then execute 'unregmp2.exe' with argument '/HideWMP' which will spawn a process at the hijacked path '%ProgramW6432%\wmpnscfg.exe'.
+    Usecase: Proxy execution of binary
+    Category: Execute
+    Privileges: User
+    MitreID: T1202
+    OperatingSystem: Windows 10
+Full_Path:
+  - Path: C:\Windows\System32\unregmp2.exe
+  - Path: C:\Windows\SysWOW64\unregmp2.exe
+Detection:
+  - IOC: Low-prevalence binaries, with filename 'wmpnscfg.exe', spawned as child-processes of `unregmp2.exe /HideWMP`
+Resources:
+  - Link: https://twitter.com/notwhickey/status/1466588365336293385
+Acknowledgement:
+  - Person: Wade Hickey
+    Handle: '@notwhickey'
+---