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Security experts brand hire a 'stunt'. Worms climb from fifth to second most prevalent cyberthreat. Worm spreads using patched security vulnerability. Uses direct message feature. iPhones need to be treated like Blackberries. Infects associated profiles. New malware could spell trouble for users of IP telephony service. Twitter has been hit by yet more security incidents over the Easter weekend, although the intent seems to have been mischief rather than password harvesting this time. Security researchers are reporting that in the past four days a worm has infected 3.5 million Windows computers. A mobile worm that leverages SMS messages and internet access has been detected. iPhone worm could strike those vulnerable. 75 per cent endorse 'Rick-roller'. A long-standing trojan that serves as a malware-distribution service has found a new way to infect computers: via a USB stick or other removable device. The Mikeyy worm has allowed spammers to spread fake anti-virus products via malicious links. The Sexy View worm is hitting smartphones and circumventing signature checks. Microsoft researchers are warning of a new malware variant that has been customised to exploit the same vulnerability as the notorious Conficker worm. A recently discovered Macintosh worm, known as OSX/Tored.A, remains a low-risk threat but is an indication that malware authors are not turning a blind eye to the Apple platform, say researchers. A new variant of the Conficker/Downadup worm has been detected that utilises peer-to-peer (P2P) file-sharing networks. The Downadup worm has spread to more than three million PCs, according to F-Secure. Computer systems that are already infected by the Conficker worm are being pushed a new component that kills protective security processes.