What is not included to the source article, several newest Trojan horses including keylogger features use Rootkit techniques to hide malware's processes from the Windows Task Manager.

Some examples:

Trojan.Satiloler.D

http://securityresponse.symantec.com/avcenter/venc/data/trojan.satiloler.d.html

and Trojan.Satiloler variant 'E'

http://securityresponse.symantec.com/avcenter/venc/data/trojan.satiloler.e.html

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