Windows user are receiving this email from Microsoft Digital Crimes Unit with the subject line "Security".
Attached to the email is a file called Microsoft_STF_install.zip. And, according to the above email, "all users of the internet" should run the program to validate "there" (sic) email account. But the attached file is infected with Troj/Agent-AANA Trojan horse.
You can read about the real Microsoft Digital Crimes Unit here.