Now you should Create a New Restore Point to prevent possible reinfection from an old one
. Some of the malware you picked up could have been saved in System Restore. Since this is a protected directory your tools cannot access to delete these files, they sometimes can reinfect your system if you accidentally use an old restore point. Setting a new restore point AFTER cleaning your system will help prevent this and enable your computer to "roll-back
" to a clean working state.The easiest and safest way to do this is
- Go to Start > Programs > Accessories > System Tools and click "System Restore".
- Choose the radio button marked "Create a Restore Point" on the first screen then click "Next". Give the R.P. a name, then click "Create". The new point will be stamped with the current date and time. Keep a log of this so you can find it easily should you need to use System Restore.
- Then use Disk Cleanup to remove all but the most recently created Restore Point.
- Go to Start > Run and type: Cleanmgr
- Click "Ok".
- Click the "More Options" Tab.
- Click "Clean Up" in the System Restore section to remove all previous restore points except the newly created one.
Flash drive infections usually involve malware that loads an autorun.inf
file into the root folder of all drives (internal, external, removable). When the removable media is inserted, autorun looks for autorun.inf and automatically executes another malicious file to run on your computer. When a flash drive becomes infected, the Trojan will infect a system when the removable media is inserted if autorun has not been disabled.
" is the feature built into Windows that automatically
runs a program specified by an "autorun.inf
" file whenever a CD-ROM, DVD or USB drive is plugged into a Windows-based computer. Autorun is intended as a convenience to automatically start an installer when removable media is inserted into the computer.
Keeping Autorun enabled on USB and other removable drives has become a significant security risk
due to the increasing number of malware variants that can infect them and transfer the infection to your computer. Read Danger USB! Worm targets removable memory sticks
I recommend disabling the Autorun feature on USB and removable drives
(especially an external drive used for backup
) as a method of prevention.
The easiest way to disable Autorun on a specific drive is to download and use Tweak UI PowerToy
- After installation, launch Tweak UI, double-click on My Computer in the tree menu on the left, then click on AutoPlay > Drives. This will allow you to change the system settings for AutoPlay/autorun.
- Uncheck the drives you want to disable AutoPlay on and click on Apply.
- Next, click on the Types in the left tree. This allows you to control whether Autoplay is enabled for CD and DVD drives and removable drives. You may need to restart Tweak UI if it closes after step 2.
- Uncheck the box to disable Autoplay for a particular type of drive.
- Click Apply.
See "Disable Autorun/AutoPlay
" for instructions with screenshots.When Autorun is disabled, double-clicking a drive which has autorun.inf in its root directory may still activate Autorun so be careful.
Always scan USB Flash Drives after they have been used in other computer systems, even your own. An easy way to do this is to download "ClamWin Portable
", install it on your USB Flash Drive, update its definition files and perform a scan.
Another prevention measure you can use is Symantec's NoScript
utility. Scroll down to the section "How to disable (or re-enable) the Windows Scripting Host" to find the link and follow the instructions
. Noscript will disable the Windows Scripting Host and prevent VBScripts from running on your machine until you run the utility again. Firefox also has a free NoScript Add-on
for its browser.