New versions of the Sober and Netsky worms started spreading over the weekend, said security firms, and although they closely resemble earlier editions, they use a new social engineering twist to sneak by users.
Both Sober.f and Netsky.s arrive as file attachments in E-mail messages that sometimes claim that they've been scanned for viruses, and that no malicious code has been detected.
"The ploy of adding a 'No virus found' message at the bottom of the E-mail is deliberately designed to appeal to those who are too impatient to practice safe computing," Graham Cluley, a senior technology consultant at anti-virus vendor Sophos, said in a statement.
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