Boot.Win32.MBRLOCK.THGOGBO

To restore your system's Master Boot Record (MBR):

• On Windows 7 and Server 2008 (R2):

1. Insert your Windows Installation DVD into the DVD drive, then press the restart button on your computer.
2. When prompted, press any key to boot from the DVD.
3. Depending on your Windows Installation DVD, you might be required to choose the installation language. On the Install Windows window, choose your language, locale, and keyboard layout or input method. Click Repair your computer.
4. Select Use recovery tools that can help fix problems starting Windows. Select your installation of Windows. Click Next.
5. If the Startup Repair window appears, click Cancel, Yes, then Finish.
6. In the System Recovery Options menu, click Command Prompt.
7. In the Command Prompt window, type the following then press Enter:
   BootRec.exe /fixmbr
8. Type exit and press Enter to close the Command Prompt window.
9. Click Restart to restart your computer normally.

• On Windows 8, 8.1, 10, and Server 2012:

1. Insert your Windows Installation DVD in the DVD drive, then restart your computer.
2. When prompted, press any key to boot from the DVD.
3. Depending on your Windows Installation DVD, you might be required to select the keyboard layout. Then on the Windows Setup window, choose your language, locale, and input method. Click Next, then click Repair your computer.
4. Click Troubleshoot>Advanced Options>Command Prompt.
5. In the Command Prompt window, type the following then press Enter:
   BootRec.exe /fixmbr
6. Type exit and press Enter to close the Command Prompt window.
7. Click Continue to restart the system normally.

To restart in Safe Mode:

• For Windows 7 and Windows Server 2008 (R2) users

1. Restart your computer.
2. Press F8 after the Power-On Self Test (POST) routine is done. If the Advanced Boot Options menu does not appear, try restarting and then pressing F8 several times after the POST screen is displayed.
3. On the Advanced Boot Options menu, use the arrow keys to select the Safe Mode option, and then press Enter.

• For Windows 8, Windows 8.1, and Windows Server 2012 users

1. Access the Charms bar by moving your mouse pointer to the upper right corner of the screen.
2. Move your mouse pointer down and click Settings>Change your PC Settings.
3. In the left panel, click General.
4. In the right panel, scroll down to the bottom to find the Advanced startup section, then click the Restart now button and wait for the system to restart.
5. In the Advanced Startup menu, click Troubleshoot>Advanced Options>Startup Settings>Restart and wait for the system to restart.
6. In the Startup Settings menu, press 4 to enable safe mode.

• For Windows 10 users

1. Press Windows logo key + I on your keyboard to open Settings. If that doesn't work, select the Start button, then select Settings.
2. Select Update & Security > Recovery.
3. Under Advanced startup, select Restart now.
4. After your PC restarts to the Choose an option screen, select Troubleshoot > Advcanced options > Startup settings > Restart.
5. After your PC restarts, you'll see a list og options. Select 4 or press F4 to start your PC in Safe Mode.

To delete the registry value this malware created:

1. Open Registry Editor. To do this:
   » For Windows 7 and Windows Server 2008 (R2) users, click the Start button, type regedit in the Search input field then press Enter.
   » For Windows 8, Windows 8.1, 10, and Windows Server 2012 (R2) users, right-click on the lower left corner of the screen, click Run, type regedit in the text box provided, and then press Enter.
2. In the left panel of the Registry Editor window, double-click the following:
   HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows>CurrentVersion>Run
3. In the right panel, locate and delete the entry:
   System data = "%Program Files%\System.dll"
4. In the left panel of the Registry Editor window, double-click the following:
   HKEY_LOCAL_MACHINE>SOFTWARE>360Safe>safemon
5. In the right panel, locate and delete the entry:
   ExecAccess data = 0;
6. Again In the right panel, locate and delete the entry:
   MonAccess data = 0;
7. Again In the right panel, locate and delete the entry:
   SiteAccess data = 0;
8. Again In the right panel, locate and delete the entry:
   UDiskAccess data = 0;
9. Close Registry Editor.

To delete registry keys this malware/grayware created:

1. Open Registry Editor. To do this:
   » For Windows 7 and Server 2008 (R2) users, click the Start button, type regedit in the Search input field then press Enter.
   » For Windows 8, 8.1, 10, and Server 2012 (R2) users, right-click on the lower left corner of the screen, click Run, type regedit in the text box provided, and then press Enter.
2. In the left panel of the Registry Editor window, double-click the following:
   HKEY_LOCAL_MACHINE>SOFTWARE>360Safe
3. Still in the left panel, locate and delete the key:
   safemon
4. In the left panel of the Registry Editor window, double-click the following:
   HKEY_LOCAL_MACHINE>SOFTWARE
5. Still in the left panel, locate and delete the key:
   360Safe
6. Close Registry Editor.

To manually delete a malware/grayware file from an affected system:

•For Windows 7, Windows Server 2008 (R2), Windows 8, Windows 8.1, Windows 10, and Windows Server 2012 (R2):

1. Open a Windows Explorer window.
   • For Windows 7 and Server 2008 (R2) users, click Start>Computer.
   • For Windows 8, 8.1, 10, and Server 2012 (R2) users, right-click on the lower-left corner of the screen,then click File Explorer.
2. In the Search Computer/This PC input box, type:
   
   • %Program Files%\System.dll
   • %Program Files%\360.dll
3. Once located, select the file then press SHIFT+DELETE to delete it.
   *Note: Read the following Microsoft page if these steps do not work on Windows 7 and Windows Server 2008 (R2).