This is maybe growing to major risk. It is detectec today and
spreading...
Symantec:
"Windows XP Service Pack 1 (Express) - Critical Update.
"Trojan.Xombe is a Trojan horse that downloads an additional file from
a predetermined Web site.
This Trojan horse has been distributed as an unsolicited email,
purporting to be an security update for Windows XP, sent by from
Microsoft.
The email has the following characteristics:
From:
(E-Mail Removed)
Subject: Windows XP Service Pack 1 (Express) - Critical Update.
Attachment: winxp_sp1.exe(4.10KB)"