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A now departed engineer built three email boxes and failed to install any form of Anti-Virus on them. Now, I have things running through my network. We've managed, as far as I can tell, to whittle it down to three (oddly enough) different servers that all have any combination of Netsky, Sober and Kukudro on them. The problem is, they won't die. We think we kill them, we've run every tool we know of but they keep coming back. Symantec deletes them everytime they pop up, but there has to be a way to completely purge them. Any ideas? We've used our Symantec Enterprise, the individual Symantec removal tools, a deep information store cleaner, and various smaller AV products. 
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A now departed engineer built three email boxes and failed to install any form of Anti-Virus on them. Now, I have things running through my network. We've managed, as far as I can tell, to whittle it down to three (oddly enough) different servers that all have any combination of Netsky, Sober and Kukudro on them. The problem is, they won't die. We think we kill them, we've run every tool we know of but they keep coming back. Symantec deletes them everytime they pop up, but there has to be a way to completely purge them. Any ideas? We've used our Symantec Enterprise, the individual Symantec removal tools, a deep information store cleaner, and various smaller AV products. 

Can't completely kill Netsky, Sober, Kukudro on a few servers.

Operating system security (OS security) is the process of ensuring OS integrity, confidentiality and availability. OS security refers to specified steps or measures used to protect the OS from threats, viruses, worms, malware or remote hacker intrusions. OS security encompasses all preventive-control techniques, which safeguard any computer assets capable of being stolen, edited or deleted if OS security is compromised, including authentication, passwords and threats to systems and programs.