Emails with spoofed headers such as admin@microsoft.com contain a file that claims to be a beta version of the browser, despite the fact that the full code was released in October 2006. The 'ie7.0.exe' file contains the Grum-A worm.
"Worms like this are spreading because so many people have still not learned to be suspicious of unsolicited emails, even if they claim to come from well-known companies like Microsoft," said Graham Cluley, senior technology consultant at Sophos.
"The problem is that the email looks genuine to the casual observer, and the image displayed looks near-identical to the imagery Microsoft is using on its website to promote Internet Explorer 7.0."
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