Sunday, April 17, 2011

DrvKiller SysAnti.exe

This article is taken from here for my future reference.

The file name SysAnti.exe has appeared in an virus analysis report detected/analyzed on 17 Sep 2009. You can see the original report at

The virus installer may further download more harmful files from the internet. A good firewall can make your computer much safer by detecting such harmful activities and blocking them. Some good freeware recommendations would be ZoneAlarm Free Firewall, and Comodo Internet Security Free Edition (you can choose to install just the firewall from their security suite)

The title of this article indicates that this file Sysm.exe is generated by a virus I have termed as DrvKiller for my convenience of grouping its reports together. You can find them listed on this link
This Nomenclature will also help to separate similar filenames generated by different sort of viruses.

It is always possible that there could be some legitimate application using the same file name, you should be in a better position to find that out, if the file/process on your computer belongs to some legitimate application or not by using special software like the Microsoft's Windows Defender and Sysinternal's Process Explorer.

It creates the file SysAnti.exe on the infected computer. You need to search and delete it. You should end any running process named SysAnti.exe from Task Manager, and also remove the file's entry from windows startup.

Boot in safe mode

Sometimes you will not be able to delete a file even if you find it, in that case you should boot in safe mode and then try to delete it/ them.

View Hidden Files

Before you could delete SysAnti.exe and its associated files you need to search for them, and before doing that you need to enable to view hidden files and folders

  • How to Enable to View Hidden Files and Folders in Windows XP
Remove Processes from Task Manager

You can find out if a process appearing in your task manager is useful or harmful by using Windows Defender to see the path of a currently running program/ process and its publisher, so as to differentiate malware processes from those belonging to legitimate publishers. You may find such processes listed under Unknown Publisher in windows defender.

How to use Windows Defender in windows XP

How to use Windows Defender in windows Vista

Or you can use Sysinternal's Process Explorer for easy detection and removal of virus processes.

Removing entry from windows startup

The system configuration can be started in xp and in vista by typing msconfig in the run box/ start menu search box. In xp by clicking on Start > run . The windows startup is reversible, therefore you can check / uncheck any entry from windows startup any number of times.

After the system configuration window is open, Click on the Startup tab, that will list all the programs that are scheduled to start with windows. Expand the middle column using your mouse pointer so that you can see the full path of the program. Locate and uncheck "SysAnti.exe " (look for any other suspicious names) Press Apply , Press Close/Ok , Select "restart" at the next prompt.

Deleting files

After restarting the computer, use the windows search utility to search for "SysAnti.exe " and also search for any other suspicious names that you found and removed in the task manager or in the start up list. This search should find all its folders on the hard disk, delete the folders from the hard disk.
These are the files created by this virus installer

C:\Program Files\Common Files\SysAnti.exe
C:\Windows\Fonts\dcgje.dllThese are other files found on other installations of this virus

Creates following registry keys

    • HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\DrvKiller
    • HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\DrvKiller\Security
    • HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\DrvKiller
    • HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\DrvKiller\Security
You need to delete them manually.

Using CCleaner

Although you can easily get rid of the files in the temp folder simply by running a freeware like the CCleaner, and you will be much safer, if you set CCleaner to run automatically each time the computer starts. more about CCleaner on this link


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