W32.Lecna.A is a worm that spreads by exploiting the Microsoft Windows Local Security Authority Service Remote Buffer Overflow (as described in Microsoft Security Bulletin MS04-011). The worm opens a back door, downloads remote files, and uses a rootkit to hide its presence on the compromised computer.

For more information read: http://securityresponse.symantec.com/avcenter/venc/data/w32.lecna.a.html

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