For instance the attachments arriving with some Bagle variants took the form of password protected archives or zip files.
BBC: NEWS | Technology | Online virus war is slowing down
Like those viruses Bagle has an in-built timer that, in this case, will stop the worm spreading on 28 January.
BBC: The Bagle virus has tricked lots of people
The feud apparently blew up because the creators of the Bagle virus were jealous of the media attention that Netsky was getting.
As well stealing e-mail addresses Bagle also attempts to let its creator know when it has managed to infect a new victim.
Security experts believe that Bagle is modelled on the notorious Sobig series of viruses as it bears many similarities with those malicious programs.
She said that if the feud goes on Netsky and Bagle could become one of the few viruses to rack up more than 26 variants.
Many people in Australia look like they have been caught out by the virus as many of the copies of Bagle caught by MessageLabs have originated there.
Like many other recent viruses, Bagle travels with its own e-mail software that help it despatch itself to all the addresses it steals from an infected machine.
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