In the latest bizarre twist in the worm's development, authors included a detailed account of what MyDoom.Y does and how it works. This particular tactic has left antivirus vendors baffled.
"It's like they wanted to help us, which is weird," said Mikko Hypponen, director of antivirus research at F-Secure. "The photo could be making the point that MyDoom has won the virus war. But then again, Netsky was much more widespread than MyDoom."
The description of the virus included two signatures, Nemog and Zincite, which Hyponnen said he had seen before in back-door code. "We don't know whether they have been planted or not," he said.
Jaschan, who was recently for creating several variants of the Netsky virus, is believed to be responsible for 70 percent of the virus infections that plagued Internet users in 2004.
Severalhave popped up recently, prompting speculation among security experts that worm writers may be trying to improve on the earlier design of the . One version even included an apparent .
Dan Ilett of ZDNet UK reported from London.