The most recent case detected involves emails warning of an alleged malware alert (with subjects such as: Worm alert! or spyware alert!), but whose real aim is to spread the Nurech.Z worm. To make the messages more credible, typically trusted sources such as Customer Support are used as the name of the sender.

Another recent case uses photographs of Britney Spears as bait. The email has subjects including “Britney spears naked pussy & paris Hilton” or “Hot pictures of Britiney Speers”. On opening the email, users will find several erotic photos of the singer. However, when they click on the photo they will actually be downloading the malicious code onto the computer. This worm exploits a vulnerability in Microsoft ANI files in order to spread. This code then downloads other examples of malware onto computers.

The third example is similar to the previous one, although it emerged a few days later. The only difference is the protagonist. In this case it uses photos of the pornstar Jenna Jameson as a lure to trick users into clicking on the link hidden in the pictures. The result is the same. The malicious code exploits vulnerabilities in ANI files to infect the computer and download more malware.

“Emails have also been received with subjects like “Hot pictures of paris hilton nude” or other similar titles. The aim is the same: to entice users into clicking on a link and falling into the trap. This is known as social engineering”, explains Luis Corrons, technical director of PandaLabs.

Another example has been used to spread the Grum.A worm. This malware spreads in emails offering a beta of Internet Explorer 7. As in the previous cases, the message contains a photograph, which in this case supposedly gave access to the beta version of IE 7.

“Why use spam to spread malware? On the one hand, junk mail reaches people on a massive scale and therefore improves the chances of success. On the other, in this way cyber-crooks get the users themselves to download the infected file, so avoiding malicious attachments being detected and eliminated by antivirus solutions.”, explains Luis Corrons.

All users that want to know whether their computers have been attacked by these or other malicious code can use TotalScan, the free online solution available from PandaLabs.

They can also use the NanoScan beta, an online scanner that detects active malware on computers in less than 1 minute.