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14 January 2004
15 January 2004
Systems Affected:
Downloader.Mimail.B is a trojan that downloads and executes the W32.Mimail.P@mm (MCID 2407) worm.
Downloader.Mimail.B is a trojan program that downloads and executes a worm on the system. The trojan was seen in the wild as part of a spam mailing. The spam message has the following properties:
Attachment: PAYPAL.ZIP
Message Body:

Dear Member,

We here at are pleased to announce that we have a special New Year offer for you! If you currently have an account with PayPal then you will be eligible to receive a terrific prize from for the New Year. For a limited time only PayPal is offering to add 10 percent of the total balance in your PayPal account to your account and all you have to do is register yourself within the next five business days with our application (see attachment)!

If at this time you do not have a PayPal account of your own you can also register yourself with our secure application and get this great New Year bonus! If you fill out the secure form we have provided PayPal will create an account for you (it's free) and you will receive a confirmation e-mail that your account has been created.

That's not all! If you resend this letter (with its attachment) to all of your friends you may be eligible to receive another New Year bonus because the 1000 PayPal members that send the most of these to their friends will get the bonus. If you are one of these 1000 lucky members then PayPal will add 17 percent of your total balance to your account!

Registration is simple. Just unpack the attachment with WinZip, run the application, and follow the instructions we have provided. If you have problems opening the application then you may want to try downloading a free version of WinZip from

Do not miss your chance at this fantastic opportunity! Thousands of our current customers have already received their prizes and now it's your turn; so hurry up and take advantage of this special offer!

Best of luck in the New Year, Team

When paypal.exe is extracted and executed from, the trojan attempts to download and execute a copy of W32.Mimail.P@mm (MCID 2407) from http:/ / The file it retrieves is named ppapp.bin, but is saved locally on the system as c:\tmp.exe.