WORM_YAHLOVER.RW

To identify and delete the malware/grayware file:

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 normally.

To enable Registry Editor, Task Manager, and Folder options:

1. Open Notepad. To do this, click Start>Run, type Notepad in the text box provided, then press Enter.
2. Copy and paste the following script:
   On Error Resume Next Set shl = WScript.CreateObject("WScript.Shell") shl.RegDelete "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools" shl.RegDelete "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools" shl.RegDelete "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System\DisableTaskMgr" shl.RegDelete "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\DisableTaskMgr" shl.RegDelete "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoFolderOptions" shl.RegDelete "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoFolderOptions"
3. Save this file as C:\RESTORE.VBS.
4. Click Start>Run again, type C:\RESTORE.VBS in the text box provided, then press Enter.
5. Click Yes at the prompt of the message box to execute the .VBS file.

To delete the registry key this malware/grayware created:

1. Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
2. In the left panel, double-click the following:
   HKEY_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>Policies
3. Still in the left panel, locate and delete the key:
   System
4. In the left panel, double-click the following:
   HKEY_LOCAL_MACHINE>Software>Policies>Microsoft>Internet Explorer
5. Still in the left panel, locate and delete the key:
   Control Panel
6. In the left panel, double-click the following:
   HKEY_CURRENT_USER>Software>Policies>Microsoft>Internet Explorer
7. Still in the left panel, locate and delete the key:
   Control Panel
8. Close Registry Editor.

To delete the registry value this malware/grayware created:

1. Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
2. In the left panel, double-click the following:
   HKEY_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>Run
3. In the right panel, locate and delete the entry:
   Yahoo Messengger = "%System%\chrome.exe"
4. In the left panel, double-click the following:
   HKEY_LOCAL_MACHINE>SYSTEM>ControlSet001>Services>Schedule
5. In the right panel, locate and delete the entry:
   AtTaskMaxHours = "0"
6. Close Registry Editor.

To restore the registry value this malware/grayware/spyware modified:

1. Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
2. In the left panel, double-click the following:
   HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Internet Explorer>Main
3. In the right panel, locate the registry value:
   Default_Page_URL = "http://h1.{BLOCKED}y.com/mygoogle0/index.html"
4. Right-click on the value name and choose Modify. Change the value data of this entry to:
   Default_Page_URL = "http://www.microsoft.com/isapi/redir.dll?prd
5. Again In the right panel, locate the registry value:
   Default_Search_URL = "http://h1.{BLOCKED}y.com/mygoogle0/index.html"
6. Right-click on the value name and choose Modify. Change the value data of this entry to:
   Default_Search_URL = "http://www.microsoft.com/isapi/redir.dll?prd
7. Again In the right panel, locate the registry value:
   Search Page = "http://h1.{BLOCKED}y.com/mygoogle0/index.html"
8. Right-click on the value name and choose Modify. Change the value data of this entry to:
   Search Page = "http://www.microsoft.com/isapi/redir.dll?prd
9. Again In the right panel, locate the registry value:
   Start Page = "http://h1.{BLOCKED}y.com/mygoogle0/index.html"
10. Right-click on the value name and choose Modify. Change the value data of this entry to:
    Start Page = "http://www.microsoft.com/isapi/redir.dll?prd
11. In the left panel, double-click the following:
    HKEY_CURRENT_USER>Software>Microsoft>Internet Explorer>Main
12. In the right panel, locate the registry value:
    Start Page = "http://h1.{BLOCKED}y.com/mygoogle0/index.html"
13. Right-click on the value name and choose Modify. Change the value data of this entry to:
    Start Page = "http://www.microsoft.com/isapi/redir.dll?prd
14. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Winlogon
15. In the right panel, locate the registry value:
    Shell = "Explorer.exe chrome.exe"
16. Right-click on the value name and choose Modify. Change the value data of this entry to:
    Shell = "Explorer.exe"
17. Close Registry Editor.