W32/Sdbot-VE is a worm which attempts to spread to remote network shares. It also contains backdoor Trojan functionality, allowing unauthorised remote access to the infected computer via IRC channels while running in the background as a service process.
W32/Sdbot-VE spreads to network shares with weak passwords and via network security exploits as a result of the backdoor Trojan element receiving the appropriate command from a remote user.
W32/Codbot-C is a backdoor Trojan containing functionality to spread via network shares.
The worm connects to an IRC channel and listens for backdoor commands from a remote attacker. The backdoor functionality of the worm includes the ability to sniff packets, download further malicious code and steal passwords and other system information.
W32/Codbot-C may attempt to exploit a number of vulnerabilities, including the LSASS vulnerability (MS04-011).