Security experts have urged companies to ensure that VoIP and instant messaging applications are not allowed to act as backdoors into corporate networks after the discovery of a new worm that spreads via Skype's IM chat system.

Pykse-A poses as a link to a photograph of a young model called 'Sandra'. Clicking on the link displays an image of a scantily clad model wearing stilettos, but only after infecting the PC with a downloader Trojan which then installs the worm.

"Once up and running, Pykse-A attempts to connect to a number of remote websites, presumably in an attempt to generate advertising revenue by increasing the number of hits," said Graham Cluley, senior technology consultant at Sophos.

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Stiletto, Malware, Internet, Security, Communication, Online Communication, Skype, Spread, Model