This new virus spreads through non-secure network shares in a similar manner as the LovGate series.  It also includes a backdoor to further compromise security, along with rootkit techniques to better hide it's presence from AV software.

Lecna.A -- Network Walker uses Rootkit approach
http://secunia.com/virus_information/29583/lecna.a/
http://www.sarc.com/avcenter/venc/data/w32.lecna.a.html

W32.Lecna.A is a worm that spreads through network shares by exploiting vulnerabilities. The worm opens a back door to allow a remote attacker to have unauthorized access to the compromised computer. It uses rootkit technology to hide its presence and may attempt to download malicious files from the Internet.