A single family of Trojans has accounted for over 60 per cent of malware infections in September, according to Fortinet.

The RogueSecurity Trojan and its variants accounted for 61.5 per cent of all malware attacks in September the company claims. The Trojan and its varients took the top four positions of the company’s malware list.

“Not since the start of this year when the notorious Storm virus made a continuous run of devastating attacks has any comparison been seen with this level of activity,” said the company.

“However where the Rogue security applications excel is the accumulated volume: maintaining these extreme levels of activity for at least six days, not to mention the other variants. “

The bulk of malware activity occurred in the second and third week of the month, with the W32/Inject.GZW!tr.bdr Trojan peaking at nearly two million in the middle of the month.

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