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Microsoft Security Intelligence
Published Nov 30, 2005 | Updated Sep 15, 2017

Trojan:Win32/Apropos.B

Detected by Microsoft Defender Antivirus

Aliases: No associated aliases

Summary

Trojan:Win32/Apropos.B is a Trojan that may be installed by Trojan dropper Trojan:Win32/Apropos.B.dr on computers running Microsoft Windows. The Trojan dropper also installs rootkit VirTool:WinNT/Zufyx.A, which hides Trojan:Win32/Apropos.B. Trojan:Win32/Apropos.B connects to certain servers from the infected computer to receive commands from attackers.   
It is not possible to recover manually from Trojan:Win32/Apropos.B. Consult the vendor of your antivirus software for specific directions for removing this Trojan.
 
To remove the Trojan using the online scanner at the Microsoft Safety Scanner, follow these steps:
  1. Restart your computer in safe mode.
  2. Run the online scanner at the Microsoft Safety Scanner.
  3. Restart your computer.
  4. Take steps to prevent re-infection.

Restart your computer in safe mode

  1. Remove all floppy disks and CDs from your computer, and then restart your computer.
  2. When prompted, press F8. If Windows starts without displaying the Please select the operating system to start menu, restart your computer. Press F8 after the firmware POST process completes, but before Windows displays graphical output.
  3. From the Windows Advanced Options menu, select a safe mode option.

Run the Microsoft Safety Scanner online scanner

  1. Go to the Microsoft Safety Scanner at http://go.microsoft.com/fwlink/?LinkId=212742
  2. Click Protection:
  3. Click Protection Scan:


    Note: Windows safe mode sometimes uses a low resolution for the monitor display. Therefore, when the protection scan runs in safe mode, some user interface controls may not be visible. In particular, the scan Cancel button may not appear on the screen, so that it is not possible to cancel a scan after it starts. This is a known issue in the current beta release of the online scanner.
  4. Follow the prompts when the scan is complete.

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 section on "How to Prevent Infection" for more information.
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