W32/Checkout!91d0b88a is a common detection is for a worm which is capable of spreading through MSN.

W32/Huhk.a propagates on removable media storage devices by infected .exe files.

W32/Randa-A can propagates on unsecured network resources. It moves the file explorer.exe from the \Windows\ folder to the \Temp\ folder.

W32/Blune is a worm which propagates through removable storage devices and infects executable files on the compromised computer with a copy of itself.

W32/Potty-B  can overwrite and infects any file that has an EXE extension with itself and replaces any others with their original name and EXE extension. It can also copy itself to removable drives.

New Malware.cn  is a heuristic detection which may detect either viruses or trojans.  If a sample is detected as New Malware.cn then it is likely that the system is currently infected and has virus or trojan processes running.

W32/Tisandr.a can infect various files. It propagates through removable media and by sending itself as email attachments. It can open backdoor port on infected computer allowing the author for a remote access.

W32/IRCbot!DF6280E5 is a description of a specific sample variant of W32/IRCbot.gen and is detected under the unqualified name.