Hasta.884 is a DOS virus that infects files that have ".com" extension.
It increases the infected file size by 844 bytes.

When the infected file is executed, the speed is slower since it
searches for ".com" files to propagate..

I-Worm.Win32.Mari is a mass-mailing worm written in Visual Basic language and has a size of 45,056 bytes.  

The worm sends mail to all addresses in the MS Outlook Address Book. The following is a sample of the mail it sends:..