Skip to main content
Skip to main content
Microsoft Security Intelligence
Cart 0 items in shopping cart
Sign in
Published Apr 11, 2005 | Updated Sep 15, 2017

VirTool:WinNT/Ispro.A

Detected by Microsoft Defender Antivirus

Aliases: No associated aliases

Summary

VirTool:WinNT/Ispro.A is a kernel-mode rootkit program that targets computers running certain versions of Microsoft Windows. It is often bundled with adware that has also infected your computer. It allows an attacker to prevent deletion or modification of certain files and registry keys on an infected computer.
To manually recover from infection by VirTool:WinNT/Ispro.A, follow these steps:
  1. Disconnect from the Internet. 
  2. Delete the Trojan file from your computer.
  3. Restart your computer.
  4. Take steps to prevent re-infection.

Disconnect from the Internet

To help ensure that your computer is not actively infecting other computers, disconnect it from the Internet before proceeding. Print this Web page or save a copy on your computer; then unplug your network cable and disable your wireless connection. You can reconnect to the Internet after completing these steps.

Delete the Trojan file from your computer

To delete the worm files from your computer
  1. Click Start, and click Run.
  2. In the Open field, type %windir%.
  3. Click OK.
  4. Click Name to sort files by name.
  5. If delprot.sys is in the list, delete it.
  6. On the Desktop, right-click the Recycle Bin and click Empty Recycle Bin.
  7. Click Yes.
If deleting the file fails, follow these steps to verify that delprot.sys is not running:
  1. Press CTRL+ALT+DEL once and click Task Manager.
  2. Click Processes and click Image Name to sort the running processes by name.
  3. Confirm that delprot.sys is not in the list.

Restart your computer

To restart your computer
  1. On the Start menu, click Shut Down.
  2. Select Restart from the drop-down list and click OK.

Take steps to prevent re-infection

Do not reconnect your computer to the Internet until the computer is protected from re-infection. See the "Preventing Infection" section for more information.
Follow us