Malicious JSRedir-R script found to be biggest malware threat on the web

Graham Cluley

Research done by experts in SophosLabs has revealed that a new web-based threat has blown all previous web-based malware out of the water, being found six times more often than its nearest rival.

Troj/JSRedir-R accounts for some 42% of all malicious infections found on websites in the last seven days, massively overshadowing its nearest rival – Mal/Iframe-F – at 7%.

Typically, JSRedir-R is found on legitimate websites, hidden behind obfuscated JavaScript, loading malicious content from third-party sites without the user’s knowledge. In the below case, the obfuscated script tries to download dangerous code from a site called

High traffic websites which have been hit by the attack include the highly unpleasant 2 Girls 1 Cup…

Read more in my article on the Naked Security website.

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Graham Cluley is a veteran of the anti-virus industry having worked for a number of security companies since the early 1990s when he wrote the first ever version of Dr Solomon's Anti-Virus Toolkit for Windows. Now an independent security analyst, he regularly makes media appearances and is an international public speaker on the topic of computer security, hackers, and online privacy. Follow him on Twitter at @gcluley, or drop him an email.