W32/Zindos-A is a worm that spreads using the backdoor opened by W32/MyDoom-O.
The worm creates one of the following registry entries to ensure that it is run each time Windows starts:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run\Tray
or
HKCU\Software\Microsoft\Windows\CurrentVersion\Run\Tray
W32/Zindos-A launches a denial of service attack against www.microsoft.com 3 minutes after the worm is started. The worm repeatedly downloads the web page www.microsoft.com at intervals starting at 1 second and increasing by 0.25 seconds for each download.