Once Zindos installs itself, the host machine is programmed to commence an immediate DDoS on Microsoft, unlike earlier MyDoom variants with trigger dates for electronic attacks.
Microsoft has previously weathered DDoS attacks from substantial bot networks compromised by MyDoom.B, MyDoom.C/DoomJuice and MyDoom.F. Variants of MyDoom have had more success in DDoS attacks against The SCO Group and the Recording Industry Association of America, but continue to target the sturdier defenses of the Microsoft site.