TROJ_NSIS.BU

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 NT>CurrentVersion
3. Still in the left panel, locate and delete the key:
   SystemRestore
4. In the left panel, double-click the following:
   HKEY_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>Policies
5. Still in the left panel, locate and delete the key:
   System
6. In the left panel, double-click the following:
   HKEY_CURRENT_USER>SOFTWARE>Policies>Microsoft>WindowsFirewall
7. Still in the left panel, locate and delete the key:
   DomainProfile
8. Again Still in the left panel, locate and delete the key:
   StandardProfile
9. In the left panel, double-click the following:
   HKEY_CURRENT_USER>Software>Policies>Microsoft>Windows>WindowsUpdate
10. Still in the left panel, locate and delete the key:
    AU
11. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>SOFTWARE>Policies>Microsoft>WindowsFirewall
12. Still in the left panel, locate and delete the key:
    DomainProfile
13. Again Still in the left panel, locate and delete the key:
    StandardProfile
14. In the left panel, double-click the following:
    HKEY_CLASSES_ROOT>CLSID
15. Still in the left panel, locate and delete the key:
    {b448d946-3623-42ab-ba32-c08651e36980}
16. In the left panel, double-click the following:
    HKEY_CLASSES_ROOT>CLSID>{b448d946-3623-42ab-ba32-c08651e36980}
17. Still in the left panel, locate and delete the key:
    InProcServer32
18. 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>Security Center
3. In the right panel, locate and delete the entry:
   FirewallDisableNotify = "1"
4. Again In the right panel, locate and delete the entry:
   UpdatesDisableNotify = "1"
5. Again In the right panel, locate and delete the entry:
   AntiVirusDisableNotify = "1"
6. In the left panel, double-click the following:
   HKEY_CURRENT_USER>Software>Microsoft>Windows NT>CurrentVersion>SystemRestore
7. In the right panel, locate and delete the entry:
   DisableSR = "1"
8. In the left panel, double-click the following:
   HKEY_CURRENT_USER>Software>Policies>Microsoft>WindowsFirewall>DomainProfile
9. In the right panel, locate and delete the entry:
   EnableFirewall = "0"
10. In the left panel, double-click the following:
    HKEY_CURRENT_USER>Software>Policies>Microsoft>WindowsFirewall>StandardProfile
11. In the right panel, locate and delete the entry:
    EnableFirewall = "0"
12. In the left panel, double-click the following:
    HKEY_CURRENT_USER>Software>Policies>Microsoft>Windows>WindowsUpdate>AU
13. In the right panel, locate and delete the entry:
    AUOptions = "1"
14. Again In the right panel, locate and delete the entry:
    NoAutoUpdate = "1"
15. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>SOFTWARE>Policies>Microsoft>WindowsFirewall>DomainProfile
16. In the right panel, locate and delete the entry:
    EnableFirewall = "0"
17. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>SOFTWARE>Policies>Microsoft>WindowsFirewall>StandardProfile
18. In the right panel, locate and delete the entry:
    EnableFirewall = "0"
19. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>SOFTWARE>Policies>Microsoft>Windows>WindowsUpdate>AU
20. In the right panel, locate and delete the entry:
    AUOptions = "1"
21. Again In the right panel, locate and delete the entry:
    NoAutoUpdate = "1"
22. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>SOFTWARE>Classes>CLSID>{b448d946-3623-42ab-ba32-c08651e36980}>InProcServer32
23. In the right panel, locate and delete the entry:
    ThreadingModel = "Apartment"
24. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows>CurrentVersion>Explorer>Browser Helper Objects>{b448d946-3623-42ab-ba32-c08651e36980}
25. In the right panel, locate and delete the entry:
    NoExplorer = "1"
26. 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>Security Center
3. In the right panel, locate the registry value:
   FirewallDisableNotify = "1"
4. Again In the right panel, locate the registry value:
   UpdatesDisableNotify = "1"
5. Again In the right panel, locate the registry value:
   AntiVirusDisableNotify = "1"
6. In the left panel, double-click the following:
   HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>SystemRestore
7. In the right panel, locate the registry value:
   DisableSR = "1"
8. In the left panel, double-click the following:
   HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Winlogon
9. In the right panel, locate the registry value:
   Shell = "{random characters}"
10. Right-click on the value name and choose Modify. Change the value data of this entry to:
    Shell = "Explorer.exe"
11. Close Registry Editor.

To delete malware/grayware component files:

1. Search for the following files:
   
   • %User Temp%\nsj2.tmp
   • %User Temp%\nsz3.tmp\NSISdl.dll
   • %Program Files%\Common Files\System\sys_vd4.dat
   • tmp.back
   • %Program Files%\Common Files\System\svchost.exe
   
   Note: To do a search for the following files, right-click Start then click Search... or Find..., depending on the version of Windows you are running. For each file to be deleted, type its file name in the Named input box. In the Look In drop-down list, select My Computer, then press Enter.
2. Once located, select the file then press SHIFT+DELETE to permanently delete the file.
3. Repeat the said steps for all files listed.

To delete malware/grayware folders:

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 Root%\DOCUME~1
   • %System Root%\DOCUME~1\ADMINI~1
   • %User Profile%\LOCALS~1
   • %User Temp%\nsz3.tmp
3. In the Look In drop-down list, select My Computer, then press Enter.
4. Once located, select the folder then press SHIFT+DELETE to permanently delete the folder.
5. Repeat the said steps for all folders listed.