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Wednesday, May 5, 2010

How to Clean a Virus Infected Flash Drive?

How to Clean a Virus Infected Flash Drive?

The USB flash drive is compact and easy to carry around. However, as the storage device is so common and easily used, the percentage of the drive being infected by viruses has also increased substantially.

In the Start-->Run and type cmd to run the Command Prompt Window.In the Command Window, type in your flash drive’s drive letter (if your pen drive is detected as G, then type G: and so on). Once you have gone in to your pen drive, now type dir/w/o/a/p and hit Enter. You will then see a list of files. Search whether any of these files appear or exist:

1. Autorun.inf
2. New Folder.exe
3. Bha.vbs
4. Iexplore.vbs
5. Info.exe
6. New_Folder.exe
7. Ravmon.exe
8. RVHost.exe or any other files with “.exe” extension

Flash Disinfector: was designed to remove unwanted files including autorun.inf on removable USB drives, flash drives and memory sticks. Use flash disinfector if you cannot access your USB drives, flash drives and memory stick due to modifications done by autorun Worms.

1. Download Flash_Disinfector and save it ot your Desktop
2. After downloading, double-click on Flash_Disinfector to run it.
3. Just follow the prompts and continue until it begin scanning.
4. If asked to insert your flash drive or any removable device including USB Pen Drive and Memory Stick, please do so.
5. It will scan removable drives, wait for the scan to finish. Done.

Clean Autoruns: When you open the drive , it says that it could not find the script file C:\autorun.vbs and whenever you right click on it some weird characters are shown.Now you cant open your drives unless you explore them.

The symptom occurs because when autorun.vbs is created by trojan horse or virus. The virus normally loads autorun.inf file to root folder of all hard drive or USB drive, and then execute autorun.bat file which contains script to apply and merge autorun.reg into the registry, with possible change to the following registry key to ensure that virus is loaded when system starts.:

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]Userinit=userinit.exe,autorun.exe

Finally, autorun.bat will call wscript.exe to run autorun.vbs

Autoruns utility, which has the most comprehensive knowledge of auto-starting locations of any startup monitor, shows you what programs are configured to run during system bootup or login, and shows you the entries in the order Windows processes them. These programs include ones in your startup folder, Run, RunOnce, and other Registry keys. You can configure Autoruns to show other locations, including Explorer shell extensions, toolbars, browser helper objects, Winlogon notifications, and auto-start services.

  • Download
  • Create a target folder for Autoruns, e.g. "%programfiles%\Autoruns".
  • Extract all files from to the target folder.
  • Inside your target folder you will find the following files now: autoruns.chm autoruns.exe autorunsc.exe Eula.txt
  • To launch Autoruns GUI version double click autoruns.exe.
  • If this is the first time you launch autoruns, you may be prompted to agree to the license terms. Either accept them and use autoruns or decline them and remove autoruns from your hard disk, please.
  • To launch Autoruns command line version, open cmd.exe. Change to the target folder, e.g. "cd %programfiles%\autoruns". Execute autorunsc.exe plus the appropriate command line arguments.
  • To launch Autoruns help file, double click autoruns.chm.

Download Autoruns Virus Remover and Washer: Autoruns Remover and Washer

Download Autorun virus removal tool :It will clean the autorun viruses which are attack to flash drive and only remove autorun viruses when you run the tool.

Autorun Eater:Autorun Eater was born due to increase of malwares using the ‘autorun.inf’ tactic to infect users unknowingly be it from flash drives, removable hard disks or any other removable storage device.

Download :Autorun Eater

Download : Newfolder.exe Removal Tool 2.5

Download BezictoSoft Malwares Loadpoint Removal Tool to remove bha.vbs,RavMon.exe,new folder.exe etc

Ravmon Removal Tools:

Virus RVHost- How to remove it?

The use of USB pen drive devices to spread the virus RVHost and other nasty things is rampant in your part of the world

1. Download and Run ComboFix (how to use it Click here)
Download this file from either of the two below listed places :

2. Doubleclick on combofix.exe and follow the prompts. A window will open with a warning. Type "1" (and Enter) to start the fix. When the scan completes Notepad will open with with your results log open. Do a File, Exit and answer 'Yes' to save changes.

A caution - Do not touch your mouse/keyboard until the scan has completed, as this may cause the process to stall or your computer to lock. The scan will temporarily disable your desktop, and if interrupted may leave your desktop disabled. If this occurs, please reboot to restore the desktop. Even when ComboFix appears to be doing nothing, look at your Drive light. If it is flashing, Combofix is still at work.

2. Clean any remaining autoruns infections.

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