Today there were found 3 new Mydoom variants: Mydoom.U, Mydoom.V and Mydoom.W. All these variants are very similar to each other. All of them download and activate a backdoor called 'Surila'.
Also, there's a hidden text inside all these Mydoom variant files: "We searching 4 work in AV industry.". Yeah, dream on, boys... antivirus industry does not hire virus writers.