A new Mydoom worm variant is spreading. Variant S of the widespread worm family arrives via email with one of the following subjects:
Mail Transaction Failed
Mail Delivery System
A more detailed description of the worm can be found at the a² Malware Database:
Mydoom.S can be detected and removed with a² using the latest signature updates. The a² personal background guard blocks the worm immediately if it is started. Please run the a² Online-Update immediately.