Wednesday, July 28, 2004

MyDoom returns

The latest version of the MyDoom could be just the first stage of a two-stage attack targeting Microsoft's main website according to the Register.

"MyDoom-M (AKA MyDoom-O) is a mass-mailing worm that opens a back door - Zincite-A - on port 1034/TCP of compromised PCs. This gives attackers remote, unauthorised access to infected PCs. First spotted on Monday afternoon, MyDoom-M has spread like wildfire, causing availability problems for leading search engines because of its use of sites such as Google to hunt for email addresses to attack.

Finnish anti-virus firm F-Secure is reporting the spread of a new worm, Zindos, which works together with MyDoom. Zindos-A is now hitching a ride on the back of the MyDoom, using the infected machine lists and the backdoors prepared by MyDoom-M, to spread. Zindos's payload includes a denial of service attack on Once Zindos has infected a machine it causes the machine to request the domain in an infinite loop, with 50ms delays. This behaviour could help to explain the difficulties some Reg experienced visiting the software giant's website earlier this week."