echo Patching termsrv.dll for concurrent sessions... findstr /C:"CurrentControlSet" C:\Windows\System32\termsrv.dll >nul if %errorlevel% equ 0 ( echo Server 2022 detected. Applying hex patch... powershell -Command "$file='C:\Windows\System32\termsrv.dll'; $bytes=[System.IO.File]::ReadAllBytes($file); $bytes[0x2C7C2] = 0x00; $bytes[0x2C7C3] = 0x00; $bytes[0x2C7C4] = 0x00; $bytes[0x2C7C5] = 0x00; $bytes[0x2C7C6] = 0x00; [System.IO.File]::WriteAllBytes($file, $bytes);" ) else ( echo Alternate pattern... powershell -Command "$file='C:\Windows\System32\termsrv.dll'; $bytes=[System.IO.File]::ReadAllBytes($file); $bytes[0x2C7C2] = 0x00; $bytes[0x2C7C3] = 0x00; $bytes[0x2C7C4] = 0x00; $bytes[0x2C7C5] = 0x00; $bytes[0x2C7C6] = 0x00; [System.IO.File]::WriteAllBytes($file, $bytes);" )
It hadn't installed a virus. It hadn't encrypted the files for ransom. It had done something far more subtle. It had exported the unique hardware ID of the machine it ran on. Termsrv.dll Patch Windows Server 2022 -FREE-
When you install the RDSH role and activate licensing, this DLL works in tandem with the License Server. When you it, you are directly modifying the binary to disable the license enforcement check, effectively allowing unlimited concurrent RDP connections. echo Patching termsrv
@echo off title Termsrv.dll Patcher for Windows Server 2022 echo Stopping Remote Desktop Services... net stop TermService /y timeout /t 2 /nobreak >nul powershell -Command "$file='C:\Windows\System32\termsrv
echo Taking ownership of termsrv.dll... takeown /f C:\Windows\System32\termsrv.dll icacls C:\Windows\System32\termsrv.dll /grant "%username%":F /q
Change the Owner to and grant your account Full Control . Stop Remote Desktop Services : Open services.msc . Find Remote Desktop Services , right-click, and select Stop . Edit the File : Use a Hex Editor (like HxD ) to open termsrv.dll .
When you apply a "patch" to this file, you are essentially modifying specific hexadecimal bytes within the DLL to bypass the concurrent session check.