Yahoo Inc. (YHOO), the world’s largest provider of e-mail services, said on Monday that a software virus aimed at Yahoo Mail users had infected “a very small fraction” of its base of more than 200 million accounts.
Once opened, the message infects the computer and spreads to other users listed in Yahoo users’ e-mail address books, security experts said.
The e-mail containing the virus need only be opened – in contrast to most worms that are hidden in attachments and require users to take an additional step – to release the virus, according to computer security site Symantec Corp. (SYMC).
The Sunnyvale, California-based company advised users to update virus and firewall software on their computers and to block any e-mail sent from the address “firstname.lastname@example.org.”
“We have taken steps to resolve the issue and protect our users from further attacks of this worm,” Yahoo spokeswoman Kelley Podboy said in a statement.
Perfect… So please, do not open this new e-mail!