Worm:Win32/Autorun.GY!inf is a computer worm. This means that the threat can propagate by itself and crawl on every computer using various tactics and deployment schemes. It is able to run the malicious code on every Windows start-up due to modification of registry entries and adding own value to run on boot-up process.

Threat Behavior


Propagation of Worm:Win32/Autorun.GY!inf is accomplished in several ways and fastest way is to copy the Worm to computers that are connected via local area network (LAN). The threat also attacks removable drives such as USB Flash Drive or removable Hard Drive where in Worm:Win32/Autorun.GY!inf places an autorun.inf file on root drive to make sure that malicious code runs automatically each time the removable drive is connected to the computer. While on the LAN setup, simply accessing the infected drive launches Worm:Win32/Autorun.GY!inf provided that Autorun feature is enabled.


When executed, Worm:Win32/Autorun.GY!inf can do the following:

  • It copies itself to Windows system folder as msmsgs.exe.
  • The worm modifies registry entries to ensure the it runs each time Windows starts.
  • Worm:Win32/Autorun.GY!inf drops malicious files on infected drives especially autorun.inf file that triggers the worm to run when user access the compromise drive.


Existence of Worm:Win32/Autorun.GY!inf can be confirmed if the following exists on the drive:

  • [targeted drive]:\subst.exe
  • [targeted drive]:\system.exe
  • [targeted drive]:\autorun.inf

It also modifies registry entries to disable Task Manager using the following value:

Adds value: “DisableTaskMgr”
With data: “1”
To subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System


Worm.Win32.AutoRun.fjx, W32/SillyFDC-AP, W32.SillyDC

How to remove Worm:Win32/Autorun.GY!inf?

To totally remove Worm:Win32/Autorun.GY!inf from the computer and get rid of relevant virus and trojan, please execute the procedures as stated on this page. Make sure that you have completely scan the system with suggested malware removal tools and virus scanners.

Remove Worm:Win32/Autorun.GY!inf Instantly

To instantly remove Worm:Win32/Autorun.GY!inf, we suggest that you scan the infected computer with this powerful anti-malware tool. It can detect and get rid of Trojans, viruses, malware, and adware from the infected computer. To fully protect the computer against Worm:Win32/Autorun.GY!inf or similar attack, you can activate Malwarebytes to have real-time scanning and complete defense against all forms of threats.

1. Download Malwarebytes Anti-Malware from the link below. Save the file on your hard drive.

2. Once the download completes, double-click on the file MBSetup.exe to run the program.

3. Select desired installation package whether for Personal Computer or Work Computer.

4. On next window, click Install button to proceed.

MBAM Default Install

5. Just proceed with the succeeding prompts until it start to execute the installation procedure.

6. Installation process will take less than a minute. It should run automatically after completing the setup.

7. When Malwarebytes Anti-Malware interface appears, please select Scan on the menu. The program will check for any available update before proceeding. Do not skip this step. Virus scan may take a while, please wait for the process to finish.


8. When scanning is done, Malwarebytes Anti-Malware will display the list of identified threats. Remove all and restart the computer to finalized the scan process.

After executing the above instructions, Worm:Win32/Autorun.GY!inf should have been eliminated totally from the computer. If there are still signs of infection or computer is displaying unusual behaviors, please continue with the remaining procedures.

Stage 1 : Start Windows in Safe Mode With Networking

Windows 10 Guide

1. Click on Windows logo and select Power icon when options pop-ups.
2. Select Restart from the options while pressing Shift key on the keyboard.
3. Choose an Option window will appear, select the Troubleshoot button.
4. On next window, please choose Advanced Option.
5. On Advanced Option window, click on Startup Settings and then, click Restart button to reboot the computer.
6. When Windows boot on Startup Settings, press function key F5 or number 5 on keyboard.

A simpler alternative for Windows 10 users is to scan the computer with Microsoft Defender Offline. This will run a virus scan in the recovery environment.

Windows 8 Guide

1. Click Windows Start icon at the lower left section of the screen.
2. Open Search window and type Advanced in the field. It will open General PC Settings.
3. Click on Advanced Startup and then, click on Restart Now button.
4. Once the computer starts in Advanced Startup option menu, select Troubleshoot.
5. Next, click on Advanced Options to reveal the next section.
6. Click Startup settings and then, click Restart button to boot the PC in Startup Settings.
7. Use function key F5 or number key 5 to Enable Safe Mode with Networking.

Stage 2 :Double Check with Microsoft Security Apps

Microsoft Windows has built-in security application that you can use to double-check if computer is still infected with Worm:Win32/Autorun.GY!inf. For Windows 8 and 10 users, please run Windows Defender. Users of Windows Vista and older versions can utilize Microsoft Security Essentials to remove Worm:Win32/Autorun.GY!inf virus.

Windows 8 / 10 Instructions:

Windows Defender is a free tool that was built help you remove Worm:Win32/Autorun.GY!inf, viruses, and other malicious items from Windows 8 or Windows 10 system. Follow these procedures to scan your computer with Windows Defender:

1. Tap or click the Search charm, search for defender, and then open Windows Defender.

If Windows Defender is not yet installed on the computer, please proceed to download page using the link below. It also contains detailed instruction to install and use the program effectively. Proper usage is required to totally remove Worm:Win32/Autorun.GY!inf


2. On the Home tab, click Full under Scan Options. Click Scan now to start scanning for presence of Worm:Win32/Autorun.GY!inf. The process may take a while to complete.


3. After the scan, delete/quarantine identified threats wether it is relevant to Worm:Win32/Autorun.GY!inf or not. You may now restart Windows to complete the virus removal process.

Windows XP, Windows Vista, and Windows 7 Instructions:

1. Open Microsoft Security Essentials by going to Windows Start > All Programs. If the tool is not yet installed on the computer, please download Microsoft Security Essentials from the link below. Save the file on your hard drive.

Complete installation guide and usage are also provided on the same link. It is essential in removing Worm:Win32/Autorun.GY!inf effectively. If Microsoft Security Essentials is already installed on the PC, please proceed with the steps below.

2. On Microsoft Security Essentials Home screen, please choose Full under Scan Options.

MSE Full Scan

3. Click on Scan Now button to start detecting Worm:Win32/Autorun.GY!inf items, viruses, and malware on the PC. Scan may take a while, please be patient and wait for the process to end.

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