It seems that even developers of security applications can sometimes cause unwanted implementations of software. Disk Knight, software designed to protect PCs from infection launched from a USB memory stick, apparently installs itself on everything in sight.
About a month ago we received a report of an alleged security program designed to protect computers against malicious programs that use USB memory sticks to spread. A good example of malware that spreads using removable USB media is W32/LiarVB-A.
The alleged security software, named Disk Knight, is developed by a Bangladeshi student and its idea is simple: if a USB key is protected by Disk Knight the program will prevent the launch of any other process on the computer and display a message prompting the user to block or allow the starting process.
Since USB malware is typically launched when the USB key is inserted, Disk Knight can prevent any virus from infecting the computer via that route. This sounds like a good idea.
However, the problem is in the implementation. Once the Disk Knight program is installed and starts protecting the computer, it will copy itself to every inserted "unprotected" USB key, making it "protected". Furthermore, if the newly protected USB key is subsequently inserted into another computer, Disk Knight will run and install itself onto the computer, all without the user's consent. This behaviour and the lack of control from the user side makes Disk Knight a computer virus.
You can easily remove Disk Knight by booting the computer in safe mode. Then in search box just type "knight.*". You will find some files, just delete it. It will be gone in a flash.Then restart the computer.Press alt+ctrl+del. Click the process tab.Check knight.exe is present or not. If you find that then you make some mistake. Do it again carefully.
Source: http://blogs.ittoolbox.com/security/adventures/archives/disk-knight-is-beneficial-virus-18456
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