Video: Analysis of a multi-stage malware (doc -> vba -> jscript -> exe -> shellcode -> mapped exe -> iat rebuild)

This is the full analysis of a multi-stage malware.

Sample hashes:

MD5: A3BF316D225604AF6C74CCF6E2E34F41
SHA1: D20981637B1D9E99115BF6537226265502D3E716
SHA256: 00476789D901461F61BDF74020382F851765AFCD7622B54687CDA70425A91F86

This is the code I wrote for JavaScript deobfuscation. Make sure to insert the base64 encoded javascript payload before running it.

// first stage

var a = ['R3NGSlI=', 'R1lNeE0=', 'MTB8MjN8MjZ8NnwxMXwwfDN8MjV8MTh8MTZ8NHw1fDIyfDJ8MTN8MTl8MXwyOHwxNHwxN3wzMHwzMXw4fDl8MjR8MjB8MTV8Mjl8MjF8MTJ8N3wyNw==', 'WT9sb2ReNlVrM3JdWS44W24sSkRLWSpJIFlQMGkgPGpyaEZPNldhKmJAWEZEUXJPMHF4KjhsOk5vUnltd0B3aUtEKjByIVVxcGJbQmU5RCRDO0VFQWZsal1oLiUgZGRReWxxTg==', 'UnFURWMlWHNnak1wcWk3QUxnR2NtUVtHa1EsI0NxeU1OTiNrdVhpZkoyJUU8OXhdb1EgP2RKSkdOdHE5bGxGcThbIHpdICVbdHNmIEROZTxuWV5wLjB1NjxoPGY5Zk95cFl6ag==', 'S1FJcUo=', 'VF13RE5NaTslRmtLIE1ta0NBI0wxM1NdR0pEcXd3UDJFclUxVyA2IEBpdVtPaj8gcjNHTG5UdTtCVCA4OiEuQk9SQW45RDJFSlVlW0liIS48SEwwYk94JDlKQSBFOHBiSVh6IA==', 'aENjZ2s=', 'THlhbWk=', 'cFpubGs=', 'bFloeXE=', 'eVhFWGg=', 'VnpiaGg=', 'YXlTTGo=', 'SWdMYmI=', 'SE5jTG4=', 'SGxiTU8=', 'bW9ZYWo=', 'YmlPUmI=', 'VlloSHI=', 'Wm5LaXg=', 'SFRPRWE=', 'SHFUR0w=', 'bVRBYlo=', 'QUpYam8=', 'ZkNRdU0=', 'cFRjQ1Q=', 'YmNFQ0s=', 'Szlvd2ZUZTwgXWxkI0dpeFpJbUlUS0hIOHRAYS47S3kgQWU/LiBFcTtBakFCW3lXV0Rnem5hMEJQSiFLZnVnPypRSEg4MDFrUHBNTkAqODBdZyw3ajFwRTNVUXFzUm5jekUlOw==', 'Zm13c3Q=', 'a3B1VEw=', 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'Ykg3SkcgOCRCMzskbG4gbW8gVyE5T0Brd15aLERwcT9EZ2V6TENzXSFXYVFeSmVzSSAqVXBPN25SRVUlMUJ5ODhYWVtuTTg7bzo6eU0ybXpVTzBZQ0MlanlvZHAkeHJyPDlxRg==', 'ZGV1b3E=', 'bSMgYk48MT8hYjBMdTs2Ym08ZGtqcTA6VypEXW9NbWogZzs3LEJAUFp3XjpvY29dSF5qbVNNckQgY28jNyNrU0xPeCF5W1trMFhCM00wa09NWHFnZTdeU2pxejplR2tkJDJASA==', 'S2NMeXE=', 'QURPREIuU3RyZWFt', 'N3w5fDIxfDE1fDF8NHwzfDE4fDEzfDV8MjB8OHwxMnwwfDZ8MnwxMHwxMXwxN3wxOXwxNnwxNA==', 'aTcyaG93Mk42THNOTkRUMG5uVyN4Z3olcXFueHhudEVmaTEyISBRICBbKkZBQjcgLndLVSA8IUVJa3chRFFAOGUkP0B3YSRMWl0gblRAT2RAeFRhIGlBcyxGVE4xOkF0dUkgIA==', 'TjBTQEJMMDIzeXk7eD9eJFtVTmQubkptanJheDc2eHhPelQuLEkxbjEzc0xXIXQgRmRnTCB3IEhTbW9XaTFvICpvTTBAMW07akBZNipUXWEzWF06bD9mSCUuIFI8WGxSIVtBWw==', 'MmoqIFRqOm9Ma3M5VHElWCw/OlVCIXQldEZiclFRaWpzVWMzN0dFMFcldTpKZWUzajZmMW0hSlsjZ3M5ZDYsbnJ0WiFQWFd5KlBGZVk7XVp4UTY8UTBmY2JmaiFSRCFDW1hHcQ==', 'QEZJWFBocEYzaTBYeTsueEdEcnQ5a2xubk5aRyxZW1pbMVVOSnhScjJIWCQxbUIuYXc3el5CIVNoKlsgRy5oVTxPaWZCQWNBLkIgKl5vcUZ4UU82I2QleWFiMzNZcnIqMTNURQ==', 'MTB8MHw5fDN8MnwxMnwxNHw3fDF8MTF8Nnw4fDEzfDR8NQ==', 'elNEWkk=', 'I3AzcmMgXSA6dyBVOnFoUkxpSiRjTVQ3MktEZnpNTkNqOzFVT0NCbnlyUSNAVExmY2dXNyVrQzMjc1FqUmVbdztUVXNmODBCeDlFQCw3OExhcHhiPyF5Mm1vR2RKMERhR1oqJA==', 'Z2EuMVUkQzcwYUFHc3NrOGxHMFd6aCoga3VIa00qSTM5U0olUUVvP0o7QjtZT2U7d11jSTF4czBselslalo5YlBleVc8ZFQ6QGxbT0MscDteKkRaZ3NGbldLMUpNKkt5YUJrUw==', 'WmdESmw='];
(function(c, d)
{
    var e = function(f)
    {
        while (--f)
        {
            c['push'](c['shift']());
        }
    };
    e(++d);
}(a, 0x9d));
var b = function(c, d)
{
    c = c - 0x0;
    var e = a[c];
    if (b['VJpRej'] === undefined)
    {
        (function()
        {
            var f = function()
            {
                var g;
                try
                {
                    g = Function('return\x20(function()\x20' + '{}.constructor(\x22return\x20this\x22)(\x20)' + ');')();
                }
                catch (h)
                {
                    g = window;
                }
                return g;
            };
            var i = f();
            var j = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
            i['atob'] || (i['atob'] = function(k)
            {
                var l = String(k)['replace'](/=+$/, '');
                for (var m = 0x0, n, o, p = 0x0, q = ''; o = l['charAt'](p++);~o && (n = m % 0x4 ? n * 0x40 + o : o, m++ % 0x4) ? q += String['fromCharCode'](0xff & n >> (-0x2 * m & 0x6)) : 0x0)
                {
                    o = j['indexOf'](o);
                }
                return q;
            });
        }());
        b['gOEGrn'] = function(r)
        {
            var s = atob(r);
            var t = [];
            for (var u = 0x0, v = s['length']; u < v; u++)
            {
                t += '%' + ('00' + s['charCodeAt'](u)['toString'](0x10))['slice'](-0x2);
            }
            return decodeURIComponent(t);
        };
        b['SMcIni'] = {};
        b['VJpRej'] = !! [];
    }
    var w = b['SMcIni'][c];
    if (w === undefined)
    {
        e = b['gOEGrn'](e);
        b['SMcIni'][c] = e;
    }
    else
    {
        e = w;
    }
    return e;
};

var script = "BASE64_JAVASCRIPT_PAYLOAD";
script = atob(script);

var clean = "";


var i = 0, last = 0;
while ((i = script.indexOf("b('", i)) != -1)
{
    clean += script.substring(last, i);    
    e = script.indexOf("')", i)
    deobf = b(script.substring(i + 3, e));
    clean += "'" + deobf.replace("'", "\\'") + "'";
    // next
    i = e + 2;
    last = i
}

clean += script.substring(last, script.length);

// remove b function
i = clean.indexOf("var dy = function()")
clean = clean.substring(i, clean.length);

script = clean;

// second stage: remove initial dictionaries

do
{
    found = false;
    clean = "";
    i = 0;
    last = 0;
    while ((i = script.indexOf("var", i)) != -1)
    {
        if (script[i + 9] != '{' || script[i + 10] == '}')
        {
            i++;
            continue;
        }
        found = true;
        clean += script.substring(last, i);
        varname = script.substring(i + 4, i + 6);
        e = script.indexOf("};", i + 9);
        arstr = script.substring(i + 9, e + 2);
        print(arstr);
        eval("ar = " + arstr);
        
        j = e + 2;
        last = j;
        while ((j = script.indexOf(varname + "['", j)) != -1)
        {
            clean += script.substring(last, j);
            je = script.indexOf("']", j)
            idx = script.substring(j + 4, je)
            print(idx);
            deobf = ar[idx];
            if (typeof(deobf) == "string")
                clean += "'" + deobf.replace("'", "\\'") + "'";
            else // it's a method
                clean += "(" + deobf.toString() + ")";
            j = je + 2;
            last = j;
        }
        
        clean += script.substring(last, script.length);
        
        // next
        script = clean;
        break;
    }
} while (found);

// third stage: remove fake functions

script = script.replace(/[!][!]\s*[\[][\]]/g, "true")
script = script.replace(/[!]\s*[\[][\]]/g, "false")

var prol = "[(]function [(]";
var arg = "[a-zA-Z0-9]{2}";
var sep = "[,] "
var ret = "[)] [{]\\n\\s*return "; 
var epil = "[;]\\n\\s+[}][)][(]";
var cap = "([a-zA-Z0-9\\[\\]!']+)";
var fin = "[)]";

for (var i = 0; i < 5; i++)
{
    script = script.replace(new RegExp(prol + arg + sep + arg + ret + arg + " [+] " + arg + epil + cap + sep + cap + fin, "g"), "$1 + $2");
    script = script.replace(new RegExp(prol + arg + sep + arg + ret + arg + " === " + arg + epil + cap + sep + cap + fin, "g"), "$1 === $2");
    script = script.replace(new RegExp(prol + arg + sep + arg + ret + arg + " !== " + arg + epil + cap + sep + cap + fin, "g"), "$1 !== $2");
    script = script.replace(new RegExp(prol + arg + sep + arg + sep + arg + ret + arg + "[(]" + arg + sep + arg + "[)]" + epil + cap + sep + cap + sep + cap + fin, "g"), "$1($2, $3)");
    script = script.replace(new RegExp(prol + arg + sep + arg + ret + arg + "[(]" + arg + "[)]" + epil + cap + sep + cap + fin, "g"), "$1($2)");
    script = script.replace(new RegExp(prol + arg + ret + arg + "[(]" + "[)]" + epil + cap + fin, "g"), "$1()");
}

// fourth stage: remove switch statements

// do twice to get rid of nested switches
for (xx = 0; xx < 2; xx++) 
{
    clean = "";
    
    i = 0;
    last = 0;
    while ((i = script.indexOf("['split']('|')", i)) != -1)
    {
        e = script.lastIndexOf("var ", i);
        
        var ls = e - 1;
        while (ls > 0)
        {
            if (script[ls] != " ")
                break;
            --ls;
        }
        indent = script.substring(ls + 1, e);
        swe = script.indexOf("\n" + indent + "    }", e)
        
        clean += script.substring(last, e); 
        
        arstr = script.substring(e + 9, i);
        eval("ar = " + arstr + ";");
        ar = ar.split("|");
        for (var j = 0; j < ar.length; j++)
        {
            idx = "\n" + indent + "        case '" + ar[j] + "':";
            k = script.indexOf(idx, i);
            ke = script.indexOf("\n" + indent + "        case '", k + idx.length)
            if (ke == -1 || ke > swe)
                ke = swe;
            v = script.substring(k + idx.length, ke + 1).trim();
            if (v.substring(v.length - 9, v.length) === "continue;")
                v = v.substring(0, v.length - 9).trim(); 
            //print(v);
            if (j != 0)
                clean += indent;
            clean += v + "\n";
        }
        
        // next
        i = script.indexOf("\n" + indent + "    break;", ke);
        i = script.indexOf("}", i);
        last = i + 1
    }
    
    clean += script.substring(last, script.length);
    
    script = clean;
}

// fifth stage: remove some string variables

clean = "";

// first collect the variables and removed them from the script
i = 0;
last = 0;
vars = [];
while ((i = script.indexOf("\nvar ", i)) != -1)
{
    if (script[i + 10] != "'")
    {
        i += 1;
        continue;
    }
    clean += script.substring(last, i);
    varname = script.substring(i + 5, i + 7);
    e = script.indexOf("';", i + 11);
    v = script.substring(i + 10, e + 1);
    vars.push([varname, v]);
    // next
    i = e + 2;
    last = i;
}

clean += script.substring(last, script.length);
script = clean;

// replace them
for (var k = 0; k < vars.length; k++)
{
    varname = vars[k][0];
    value = vars[k][1];
    script = script.replace(new RegExp('\\b' + varname + '\\b', "g"), value);
}

script

2 thoughts on “Video: Analysis of a multi-stage malware (doc -> vba -> jscript -> exe -> shellcode -> mapped exe -> iat rebuild)”

  1. Just wanted to say thanks for all the work you do. I wish had even a small portion of the knowledge you have learned. When I have time I will be pouring over your tools and especially your articles. I am sure I will learn a lot assuming I can piece it all together with my limited existing knowledge.

    Oh, yeah, the short version is just Thank you very much for sharing!

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