WORM_YAHLOVER.C

To identify and delete of malware/grayware files:

1. Insert your Windows Installation CD in your CD-rom.
2. Press the restart button of your computer.
3. When prompted, press any key to boot from the CD.
4. When prompted on the Main Menu, type r to enter the recovery console.
   (Note: On Windows 2000, after pressing r, type c to choose the Recovery Console in the repair options screen.)
5. When prompted, type your administrator password to log on.
6. Once logged in, type the drive that contains Windows in the command prompt that appears, then press Enter.
7. Type the drive that contains Windows, then press Enter.
8. Type the following, then press Enter:
   del {malware/grayware path and file name}
9. Repeat the above procedure for all files detected earlier.
10. Type exit to restart the system.

To restore the registry value this malware/grayware modified:

1. Open Registry Editor. Click Start>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>Windows NT>CurrentVersion>Winlogon
3. In the right panel, locate the registry value:
   Shell = "Explorer.exe scvhost.exe"
4. Right-click on the value name and choose Modify. Change the value data of this entry to:
   Shell = "Explorer.exe"
5. Close Registry Editor.

To delete the registry value this malware created:

1. Open Registry Editor. To do this, click Start>Run, type regedit in the text box provided, then press Enter.
2. In the left panel of the Registry Editor window, double-click the following:
   HKEY_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>Internet Settings
3. In the right panel, locate and delete the entry:
   GlobalUserOffline = "0"
4. In the left panel of the Registry Editor window, double-click the following:
   HKEY_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>Run
5. In the right panel, locate and delete the entry:
   Yahoo Messengger = "%System%\scvhost.exe"
6. Close Registry Editor.

To delete the malware/grayware/spyware file:

1. Right-click Start then click Search... or Find..., depending on the version of Windows you are running.
2. In the Named input box, type:
   
   • %System%\autorun.ini
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 permanently delete the file.

To identify and delete AUTORUN.INF files created:

1. Right-click the Start button then choose Search... or Find..., depending on the version of Windows you are running.
2. In the Named input box, type:
   AUTORUN.INF
3. In the Look in: drop-down list, select a drive, then press Enter.
4. Select the file, then open using Notepad.
5. Check if the following lines are present in the file:
   
   [Autorun]
   Open=scvhost.exe
   Shellexe cute=scvhost.exe
   Shell\Open\command=scvhost.exe
   Shell=Open
6. If the lines are present, delete the file.
7. Repeat steps 3 to 6 for the remaining AUTORUN.INF files in other remaining removable drives.
8. Close Search Results.