TROJ_INJECTO.YYWU

To delete the registry key this malware/grayware created:

1. Open Registry Editor.
   » For Windows 2000, Windows XP, and Windows Server 2003 users, click Start>Run, type regedit in the text box provided, and then press Enter.
   » For Windows Vista, Windows 7, and Windows Server 2008 users, click the Start button, type regedit in the Search input field then press Enter.
   » For Windows 8, Windows 8.1, and Windows Server 2012 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, double-click the following:
   hkey_local_machine>software>microsoft>esent>process
3. Still in the left panel, locate and delete the key:
   {malware file name}
4. In the left panel, double-click the following:
   hkey_local_machine>software>microsoft>esent>process>{malware file name}
5. Still in the left panel, locate and delete the key:
   debug
6. In the left panel, double-click the following:
   HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>ESENT>Process
7. Still in the left panel, locate and delete the key:
   hknswc
8. In the left panel, double-click the following:
   HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>ESENT>Process>hknswc
9. Still in the left panel, locate and delete the key:
   DEBUG
10. Close Registry Editor.

To restore registry values this malware/grayware modified:

1. Open Registry Editor. To do this:
   
   • On Windows 2000, XP, and Server 2003:
     Click Start>Run, type REGEDIT in the text box provided, and then press Enter.
   • On Windows Vista, 7, and Server 2008:
     Click the Start button, type REGEDIT in the Search input field then press Enter.
   • On Windows 8, 8.1, and Server 2012:
     Right-click on the lower left corner of the screen and click Run, type REGEDIT in the Run input field, and then press Enter.
2. In the left panel, double-click the following:
   HKEY_LOCAL_MACHINE>SYSTEM>ControlSet001>Services>Eventlog>Application>ESENT
3. In the right panel, locate the registry value:
   EventMessageFile = "%System%\ESENT.dll"
4. Right-click on the value name and choose Modify. Change the value data of this entry to:
   EventMessageFile = "{random values}"
5. Again In the right panel, locate the registry value:
   CategoryMessageFile = "%System%\ESENT.dll"
6. Right-click on the value name and choose Modify. Change the value data of this entry to:
   CategoryMessageFile = "{random values}"
7. Again In the right panel, locate the registry value:
   CategoryCount = "1"
8. Right-click on the value name and choose Modify. Change the value data of this entry to:
   CategoryCount = "10"
9. Again In the right panel, locate the registry value:
   TypesSupported = "7"
10. Right-click on the value name and choose Modify. Change the value data of this entry to:
    TypesSupported = "7"
11. In the left panel, double-click the following:
    HKEY_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>Explorer>Advanced
12. In the right panel, locate the registry value:
    Hidden = "1"
13. Right-click on the value name and choose Modify. Change the value data of this entry to:
    Hidden = "2"
14. Close Registry Editor.

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

• For Windows 2000, Windows XP, and Windows Server 2003:

1. Right-click Start then click Search....
2. In the File name* input box, type the following:
   
   • %User Profile%\Windows\AppMgnt.exe
   • %User Profile%\Application Data\pid.txt
   • %User Profile%\Application Data\pidloc.txt
3. In the Look In drop-down list, select My Computer then press Enter.
4. Once located, select the file then press SHIFT+DELETE to delete it.
   *Note: The file name input box title varies depending on the Windows version (e.g. Search for files or folders named or All or part of the file name.).

• For Windows Vista, Windows 7, Windows Server 2008, Windows 8, Windows 8.1, and Windows Server 2012:

1. Open a Windows Explorer window.
   • For Windows Vista, 7, and Server 2008 users, click Start>Computer.
   • For Windows 8, 8.1, and Server 2012 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:
   
   • %User Profile%\Windows\AppMgnt.exe
   • %User Profile%\Application Data\pid.txt
   • %User Profile%\Application Data\pidloc.txt
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.