New worm was discovered which use usual bug of Outlook. It's arrive to you a mail with an attchement (LOVEDAY14-B.HTA).
When the viral code runs, it drops a file LOVEDAY14-B.HTA into the Windows StartUp folder. On the next occasion the infected computer is rebooted, the dropped HTA file is run. It first changes the Internet Explorer homepage so that it points to a page which contains a dropper for VBS/Valentin-A worm (this webpage has now been shut down) and then drops a file called MAIN.HTML into the Windows System directory.
Microsoft has released a security bullettin (MS99-032 Aug 31 1999).
Complete article:
http://www.sophos.com/virusinfo/analyses/vbssana.html