Search This Blog

Saturday, January 28, 2012

WARNING: igfx.exe - Worm - IRC Bot

A suspicious file named igfx.exe has appeared in a virus analysis report. You can see it on this link

igfxtray.exe is a legitimate process that implements the system tray icon associated with the drivers for the Intel 81x series graphics chipset. It is usually located with C:\Windows\System32

The installer is of about 151 KB. It is identified as
Trojan.IRCBot!rem [PCTools]
Generic.dx!ugm [McAfee]
Trojan:Win32/Sisron [Microsoft]
Trojan.Win32.Ircbrute [Ikarus]
It makes changes to the hosts file so as to block security related websites
It tries to infect other computers in a network by launching a dictionary attack.
It communicates with a IRC channel to carry out malicious activities on the infected computer. You can read an article in Wikipedia devoted to IRCBot
Another useful reading is on Symantec website

There are no standalone removal tools created by Antivirus companies for removing IRCBot. Any antivirus program with help of a good firewall should be able to control the virus.
You can see other similar instances of tis virus under the title Similar in the right column. [keyword: ircbot]

It creates igfx.exe and other files on the infected computer that you need to search and delete. You should end running processes named igfx.exe from Task Manager. And also remove the file's entries from windows startup.

Warning: It is possible that some legitimate software may be using the same file names as that of the virus files. You do not have to delete these files if they belong to some legitimate program installed on your computer. Use Windows Defender or SysInternals Process Explorer to differentiate between them. The information in this article is presented without making any claims regarding its usefulness or otherwise. If you have any objections or questions, please send a note by adding a comment at the end of this page, or mail on support(at)

Preventive measures

Most of the viruses enter your computer when you visit some harmful website. If you use a browser plugin that warns you about harmful websites, you can prevent this from happening. A popular browser plugin is called Web Of Trust (WOT), you can install it from its website on this link.
[ a video about WOT plugin ]
Blocking Javascript of all sites by default can help to prevent drive by download infections. You can use Noscript Plugin for firefox as explained in this video. Similar functionality can be achieved in Google's Chromium browser using the settings in Preferences > Under the Hood > Content Settings > Java Script > Select "Do not Allow". After that when you visit a site, you will see a pop up next to the address bar asking you if you want to allow JavaScript to run for that particular site. The author of NoScript is writing a similar plugin for IE9 called GoodScript. Keep an eye on when it becomes available.
Some of the viruses are downloaded in Internet Cache or in the Temp folder of the windows. The viruses get activated when these files are executed. You can reduce the risk of virus infection if you empty your browser cache and remove windows temp files occasionally, ideally at the end of a browsing session or before closing down your computer. Some programs like CCleaner can be set to do these things automatically. [ a video about CCleaner ]
Do not leave your computer infected and insecure. If you doubt that there could be some undetected virus on your computer, don't leave it like that. Format the hard disk and reinstall windows and all other programs. That is the sure way to clear doubts.

Using System Restore

If you know the duration since your computer is infected, you can try to restore your computer at a prior date, that will be an easy way to undo the changes done by the virus

Using system restore in windows XP
Using system restore in windows Vista
Using system restore in windows7

[ Video of How to use System Restore ]

Boot in safe mode

Sometimes you can not delete a file. You should boot in safe mode and then try to delete it.

How to boot in safe in windows XP
How to boot in safe mode in windows Vista
How to boot in safe mode in windows7

View Hidden Files

You need to enable to view hidden files and folders before searching.
How to Enable to View Hidden Files and Folders in Windows XP
How to Enable to View Hidden Files and Folders in Windows Vista
How to Enable to View Hidden Files and Folders in Windows7

[ Video of How to enable Hidden files and folders ]

Remove Processes from Task Manager
Press Ctrl Alt Del keys to open the Task Manager.Select Processes tab. You will see a list. Look for the names igfx.exe in it. Select if found and press the End Process button. It will ask for your confirmation to end that process. Select Yes. You can end one process at a time. You can find out if a process in Task Manager is good or bad by using Windows Defender in XP and Vista. It shows the path of a process and its publisher. Harmful processes may be shown under Unknown Publisher in windows defender. Whereas in Windows7 you can find that out from the task manager itself. You can watch a video on How to use Windows Defender.

How to use Windows Defender in windows XP
How to use Windows Defender in windows Vista
How to use Windows Defender in windows7

Or you can use Sysinternal's Process Explorer. How to use Sysinternal's Process Explorer

[Video of How to use Sysinternal's/ Windows Process Explorer]

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. You can check / uncheck any entry from windows startup any number of times. Watch a video on How to Use the Windows Startup

Open system configuration window.Click on the Startup tab. You will see a list all the programs that are scheduled to start with windows. Expand the middle column using your mouse pointer. That will show you the full path of the program. Locate and uncheck the boxes in front of these names "igfx.exe" (also look for any other suspicious names)Press Apply , Press Close/Ok , Select "restart" at the next prompt.
Deleting files

The computer will restart now. Delete the following files and folders. Boot in safe mode or boot in the dos prompt if needed. You can use windows search utility to search for igfx.exe



Files in Temp folder

Installer File
[file and pathname of the sample #1]

(We do not know the name or the location of sample #1, it could be in your default download location or on the desktop or in a Temp folder. The files and folders in the Temp folder can be automatically removed, if you use a freeware temp files/ registry cleaner software like CCleaner)

Repair Hosts File

To repair/ edit the hosts file. Login as administrator. open the following file in notepad
C:\ WINDOWS \system32 \drivers \etc \hosts
remove anything other than Localhost, and save and close the file.

Registry Keys

Some of the registry keys will be automatically removed if you run Registry menu of CCleaner. For others you can see the report mentioned at the beginning of this article .

Using CCleaner

You can easily remove the files in the temp folder by running CCleaner. You can set CCleaner to run automatically each time the computer starts. Do not forget to run CCleaner > Registry menu to remove the obsolete registry entries.

more about CCleaner on this link

[Video on how to use CCleaner]

Free tools to repair disabled folder options, registry, Task Manager etc

Whereas you can repair disabled Folder Options, disabled Registry Tools, disabled Task Manager, Disabled System Restore etc using these free tools

Tools for Windows Vista
Tools for Windows XP
Tools for Windows7

Use the System File Checker

To repair altered deleted or modified windows system files.

How to run System File Checker utility in windows XP
How to run System File Checker utility in windows Vista
How to run System File Checker utility in windows7

Additional Information
Virus infections are complex. Most of the times a virus on the computer downloads more files and make it complicated. In my attempt to warn users about the different ways that viruses are trying to infect and ways to find them and remove, I have created videos on specific Free tools and manual methods, these videos could be of great help

1) To detect and remove malicious Alternate Data Streams - Stream Armour

2) To detect and remove malicious Services - Advanced WinService Manager

3) To detect and remove viruses in Fake recycle Bin - Watch Video

4) keep an eye on suspicious connections using a Firewall - Free Comodo Firewall

5) A free tool to detect and remove unwanted BHOs - SpyBHO Remover
Reprinted with permission from

No comments:

Post a Comment