With the release of "Patch Tuesday", which is a low-volume threat circulated as a Microsoft update. By this attack, the ignorant user is attracted towards clicking into the link attached within the e-mail message. This malicious software evidently attacks the user's system by infecting the machine, reports Websense on May 09, 2011.
Only 11% detection rate has been visible from the hosting of the fake patch on a compromised system as reported by Websense.
The pertaining messages of the e-mails seem to be quite legitimate as the display names within the headers provide indication of being originated from Microsoft Canada. The other attributes of the message provide the sense of urgency within the subject: Critical Security Update".
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