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Microsoft Security Intelligence
Published Sep 15, 2011 | Updated Sep 15, 2017

TrojanDropper:Win32/Rovnix.A

Detected by Microsoft Defender Antivirus

Aliases: TrojanDropper:Win32/Lageliz.B (other) Win32/PSW.Papras.BZ trojan (ESET) Trojan.Win32.Agent.nkwx (Kaspersky) Trojan.Cidox (Symantec) TROJ_VUNDO.SMC (Trend Micro)

Summary

TrojanDropper:Win32/Rovnix.A is a trojan that modifies the New Technology File System (NTFS) boot sector of the hard drive to execute other malware. The trojan also installs a component, detected as Trojan:Win32/Rovnix.A, to restart the computer so the modified NTFS boot sector will execute.

The following free Microsoft software detects and removes this threat:

Even if we've already detected and removed this particular threat, running a full scan might find other malware that is hiding on your PC.

Run the Bootrec.exe tool

To completely remove this threat you might need to run the Bootrec.exe tool using your Windows installation CD.

For Windows 8:

  1. Put your Windows 8 media in the DVD drive and restart your PC.
  2. Select a language, time and currency, and keyboard or input method, and then click Next.
  3. Click Repair your computer.
  4. Click Troubleshoot, then Advanced options.
  5. Click Command Prompt and then type Bootrec /FixBoot and then presss Enter.
  6. Type Exit and the press Enter.
  7. At the Choose an Option screen click Continue.
  8. Remove the Windows 8 CD from your DVD drive and restart your PC.

For Windows 7:

  1. Put your Windows 7 media in the DVD drive and restart your PC
  2. Press any key when you are prompted.
  3. Select a language, time and currency, and keyboard or input method, and then click Next.
  4. Click Repair your computer.
  5. Select the operating system that you want to repair, and then click Next.
  6. In the SystemRecovery Options dialog box, click Command Prompt.
  7. Type Bootrec.exe /fixboot, and then press Enter.
  8. Remove the Windows 7 CD from your DVD drive and restart your PC.
Get more help

You can also visit our advanced troubleshooting page or search the Microsoft virus and malware community for more help.

If you’re using Windows XP, see our Windows XP end of support page.

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