This one's like Beagle.I,with messages sent in the following(or similar) format

Dear user of e-mail server "",

Our antivirus software has detected a large ammount of viruses outgoing
from your email account, you may use our free anti-virus tool to clean up
your computer software.

For more information see the attached file.

For security purposes the attached file is password protected. Password is "xxxxxx".

The Management,
The team