There appears to be an actual email worm in circulation right now, using the tried-and-true infection method of sending malicious emails to all of the names in a user s email address book. The worm arrives via emails with the subject line Here You Have or something similar, and the messages contain a link to a site that will download a malicious file. The malware drops itself into the Windows directory with a file name CSRSS.EXE, which is identical to a legitimate Windows file.
Source: https://threatpost.com/new-email-worm-turns-back-clock-virus-attacks-090910/74447/