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Published May 15, 2013 | Updated Sep 15, 2017

Worm:JS/Proslikefan.gen!D

Detected by Microsoft Defender Antivirus

Aliases: JS/Proslikefan.A.3 (Avira) Troj/ObfJS-EF (Sophos)

Summary

Windows Defender Antivirus detects and removes this threat.
 
This worm collects information about your computer and may download other malware. It can also stop your security software from working correctly.
 
It spreads through file-sharing networks and removable drives.

To detect and remove this threat and other malicious software that may be installed on your computer, run a full-system scan with an appropriate, up-to-date, security solution. The following Microsoft products detect and remove this threat:

This threat may add a malware program to the Windows Firewall exception list. To remove the program exception, follow these steps:

For Windows 8:

  1. Open Windows Firewall by swiping in from the right edge of the screen, tapping Search (or if you're using a mouse, pointing to the upper-right corner of the screen, moving the mouse pointer down, and then clicking Search), entering firewall in the search box, tapping or clicking Settings, and then tapping or clicking Windows Firewall.
  2. In the left pane, tap or click Allow an app or feature through Windows Firewall.
  3. Tap or click Change settings. You might be asked for an admin password or to confirm your choice.
  4. Select the check box next to the app you want to allow, select the network types you want to allow communication on, and then click OK.

For Windows 7:

  1. Click Start, select Control Panel, then System and Security.
  2. Select Windows Firewall.
  3. On the left-hand menu, select Allow a program through Windows Firewall. If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
  4. Click Change Settings. If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
  5. Select <program name> from the list of allowed programs and features. Click Remove.
  6. Click OK.

For Windows Vista:

  1. Click Start, select Control Panel, then Security Center.
  2. On the left-hand menu, select Windows Firewall.
  3. On the left-hand menu, select Allow a program through Windows Firewall. If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
  4. Select <program name> from the list of allowed programs and features. Click Delete.
  5. Click OK.

For Windows XP:

  1. Use an administrator account to log on.
  2. Click Start, select Run, type wscui.cpl, and then click OK.
  3. In Windows Security Center, click Windows Firewall.
  4. On the Exceptions tab, click <program name> and then click Delete.
  5. Click OK.
Enabling registry editor

This threat may modify the computer to prevent Registry Editor from running. To enable Registry Editor in your computer, please do the following:

  1. Run a command prompt. Click Start>Run and type cmd.
  2. In the command prompt, type the following as is and press Enter:
    reg.exe add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableRegistryTools /t REG_DWORD /d 0 /f
Restoring the system registry

This malware changes registry data that will not be restored by detecting and removing this threat. To return registry data on an affected computer to its pre-infected state, run System Restore:

Additional remediation
This threat can make it difficult for you to download, install or update your virus protection, whether you have an antivirus product such as Microsoft Security Essentials installed on your computer or not.

If you suspect you have been infected with this threat, we recommend using Windows Defender Offline to detect and remove it.

Windows Defender Offline is a standalone tool that contains the latest antivirus updates from Microsoft.

It is not a replacement for a full antivirus solution that provides ongoing protection. It is meant to be used in situations where you cannot start or scan your computer because it is infected with malware that prevents antivirus products from working normally.

Before you begin you will need:

  • A computer that is not infected and is connected to the Internet. You will use this computer to download a copy of Windows Defender Offline
  • A blank CD, DVD or USB drive (also known as a USB key or thumb drive). You will use this CD, DVD or USB drive to run the tool on your infected computer

Follow these steps to use Windows Defender Offline:

  1. Use an uninfected computer to download a copy of the tool from here: Windows Defender Offline

    In order for the recovery tool to be effective, make sure you download the version that matches the your infected computer. For example, your desktop computer has been infected with malware. The computer is running a 64-bit version of Windows. Your friend's laptop, however, is not infected, and so you use that to download Windows Defender Offline. Your friend's laptop is running a 32-bit version of Windows, so when you download the tool, you choose the 64-bit version, because that is the version that matches your computer.

  2. Install the tool on a blank CD, DVD, or USB drive
  3. Insert the CD, DVD, or USB drive into your infected computer and run the tool
  4. Let the tool clean your computer and remove any infections it finds

After running the tool, ensure that your antivirus product is up-to-date. You can update Microsoft security products by downloading the latest definitions at this link: Get the latest definitions. You can Use the Microsoft Safety Scanner if you suspect you are infected but are unable to confirm this with your existing antivirus software.

For detailed instructions on using Windows Defender Offline, see the Microsoft Security Blog post "Microsoft's Free Security Tools - Windows Defender Offline" by Tim Rains.

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