Windows Security Tutorials - Herong's Tutorial Examples - Version 3.00, by Dr. Herong Yang
Detecting Trojan Vundo with McAfee VirusScan
This section provides a description of interesting behaviors of McAfee VirusScan reporting trojan Vundo infected files.
I decided to take a look at those suspicious DLL files on my own computer. The results are very interesting. I want to share with you here.
1. The first interesting note is on how McAfee VirusScan reacts to the DLL files. As I unzip the bho_200610.zip file that contains those suspicious DLL files, McAfee VirusScan On-Access Scan pops up a window telling that:
fcissfvg.dll Vundo Trojan Deleted lyssmlnb.dll Vundo Trojan Deleted
Okay. This is nice. VirusScan is doing the job to pretect my system. But it only detected 2 out 3 DLL files. What happens to the third DLL file, yjsallam.dll? Did VirusScan fail to do the job or yjsallam.dll is not a Vundo infected file?
I believe VirusScan failed to do the detection job. But I can not prove it.
2. The second interesting note is on the impact left on my Windows system after McAfee VirusScan detected Trojan Vundo. When tried to shut down my Windows system after unzipping bho_200610.zip and closing McAfee VirusScan detection report window, my system, Windows XP, did close all applications normally. But it failed to shutdown completely with only the desktop background image on the screen. Nothing else is running.
I tried to push the power off button, but the system refused to shutdown. I have to remove the external power supply and remove the battery. That, of course, turned off the system completely.
Then I put the power supply back, and turned on the system. Windows started without any trouble. VirusScan did not report any issues. So may be it's normal for VirusScan to hold your shut down process to prevent triggering Vundo program again.
I did repeat 3 times of playing with McAfee VirusScan on those suspicious DLL files. I got exactly the same results:
Last update: 2006.
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