Marcos Velasco, who is based in Rio de Janeiro, has admitted writing the Lasco virus, which is one of the first potentially serious viruses to target the Symbian operating system.
In a recent interview with Finnish magazine ITviikko, which has been translated into English by mobilemonday.net, Velasco admitted creating Lasco to demonstrate how a real mobile phone virus could work -- but denies he wants it to spread.
"I'm a professional programmer. Viruses, hacking and security are my favourites. Viruses are my life... I'm not trying to spread the worm... I want to demonstrate how the worm works," said Valesco.
Valesco said Lasco will be his last mobile phone virus but he claims that a potential change in Brazil's computer laws would not have stopped him from pursuing his hobby.
"At the moment I think Lasco is my last mobile virus. It's the first real mobile virus and that's enough for me... The politicians are working on new computer crime law but I'll continue my studies with viruses regardless of the outcome," said Valesco.
However, Velasco's behaviour has been severely criticised by antivirus firms and security experts.
Paul Ducklin, head of technology in Asia Pacific for Sophos, said that although publishing viral source code isn't illegal in most countries, it should be done responsibly.
"Most viral source code isn't directly malevolent on its own. But, as the clichÃƒÂ© goes, 'with freedom comes responsibility', and Velasco shows none of the latter," said Ducklin.
Mikko HyppÃƒÂ¶nen, director of antivirus research at F-Secure, believes there should be a global agreement to prosecute virus writers that hide in countries with less friendly IT security laws.
"Valesco is openly writing viruses and making them available from his website to anyone, anywhere in the world. So any kid, any lunatic, any anarchist anywhere can download all his viruses complete with sourcecode and do whatever they want with them. Virus writing should be illegal and it should be illegal globally," said HyppÃƒÂ¶nen.
Sophos's Ducklin said one reason people write viruses is for the notoriety and in this case Valesco has received considerable attention from the media. However, Ducklin said Valesco should prove his programming skills by creating a real application rather than malware.
"Writing complete, tested and supported applications with a useful function is generally much more difficult that writing viruses. If Velasco really is -- or deserves to consider himself -- a professional programmer then he'd realise this and act professionally. I'd say that if viruses really are 'his life', as he claims, then he needs to get out more," said Ducklin.