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<!DOCTYPE html>
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<h1>marginal's blog</h1>
<!--<hr class="small">-->
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<!-- top start (article top hot config) -->
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<a href="/cn/android抓包总结/">
<h2 class="post-title">
android抓包总结
</h2>
<h3 class="post-subtitle">
</h3>
<div class="post-content-preview">
android抓包基础总结
针对常见的抓包方式以及对抗做了一个总结
抓包方式分类
网卡抓包
肯定能抓到, 但是是未解密的数据, 可能用来抓http比较好使一点
Hook数据抓包
如果直接hook底层api可以直接省掉逆向分析, 并且帮助逆向分析程序执行逻辑(使用frida等hook工具来打印堆栈回溯等), 但是hook出来的数据进行分析有些麻烦.
代理抓包
可以直接对h......
</div>
</a>
<p class="post-meta" style="margin: 10px 0;">
Posted by marginal on
2023-06-15
</p>
<div class="tags">
<a href="/tags/#re-android" title="re-android">re-android</a>
</div>
</div>
<hr>
<div class="post-preview">
<!-- top start (article top hot config) -->
<!-- top end -->
<a href="/cn/bytectf-mitm/">
<h2 class="post-title">
bytectf_mitm
</h2>
<h3 class="post-subtitle">
</h3>
<div class="post-content-preview">
bytectf-mitm
这是一道关于android-binder的题目(android 漏洞题), 涉及到服务权限相关的东西, 之前实习的时候研究过关于binder的东西, 所以这里赛后就复现一下, 如果有什么不对的地方, 欢迎师傅们指出.
本地测试环境
先是拿到题目文件, 在readme里面有提示告诉我们启动一个出题人魔改的镜像.
123在Android Studio中通过SDK Ma......
</div>
</a>
<p class="post-meta" style="margin: 10px 0;">
Posted by marginal on
2022-11-13
</p>
<div class="tags">
<a href="/tags/#CTF-reverse" title="CTF-reverse">CTF-reverse</a>
</div>
</div>
<hr>
<div class="post-preview">
<!-- top start (article top hot config) -->
<!-- top end -->
<a href="/cn/android脱壳相关-dex-类-加载与执行/">
<h2 class="post-title">
android脱壳相关_dex(类)加载与执行
</h2>
<h3 class="post-subtitle">
</h3>
<div class="post-content-preview">
0x00 前言
在学习android脱壳的时候在想一个点, ART是java虚拟机, 如果要执行dex文件, 需要有一个dex加载到ART虚拟机的过程, 这个加载的函数在加载的时候的dex文件必然是完整正确的dex, 除非是魔改dex的执行过程, 所以只需要找到这个加载的时机就可以把壳脱下来.
0x01 app启动过程
当点击桌面图标时, 桌面这个app会通过binder机制进行跨进程通......
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Posted by marginal on
2022-09-18
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<a href="/tags/#re-android 脱壳" title="re-android 脱壳">re-android 脱壳</a>
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一次简单steam版权保护移除
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一次简单steam版权保护移除
前面一段时间我在b站当云玩家的时候看到有个游戏叫大多数挺好玩的, 当我去steam上面找的时候, 发现这款游戏试玩期已经结束了, 网上搜了一下没找到啥盗版, 就自己上手看了一下, 发现基本上无保护, 当时想的是那应该只是套的官方steam验证接口, 事实雀氏如此, 不过听说这个游戏更新了之后, 就加入了很多反作弊内容, 具体我没有去看了, 等以后有需求再去学......
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Posted by marginal on
2022-04-29
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starctf
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XCTF分站赛, 这次分别出了jump和simplefs两个题目, simplefs有其他师傅比我先出了, 就没有写wp了.
jump
通过静态分析查看, 判断函数返回值永远是0, 经过调试之后发现这里会改变程序的控制流
对输入进行交叉引用, 可以发现这些地方flag相关:
1234567sprintf(qword_4C9400, (__int64)"%c%s%c",......
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Posted by marginal on
2022-04-29
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<a href="/tags/#CTF-reverse" title="CTF-reverse">CTF-reverse</a>
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d3ctf
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这次写了两道的wp, 第一道u3d的游戏队友出得比我快, 就没写了.
d3thon
打开一看发现是python导入pyd一类的东西, 用python3.10可以跑起来.
lbc包含了指令的逻辑, byte_analizer.so是类似解释器的东西, pyd的逆向非常困难, 所以我直接通过输入输出来猜测lbc文件中的逻辑. (byte_ananlizer有成员Variables来获得变量值
......
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<p class="post-meta" style="margin: 10px 0;">
Posted by marginal on
2022-03-15
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SCTF low_re
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SCTF low_re
这个题其实算是逆向题, 考虑到这个题不是常规逆向思路, 并且有点谜语, 所以我把这个题放misc里面了.
出题人比较菜, 如果给师傅们造成了不好的体验, 轻点骂, orz.
这个题目的预期解是通过pintool之类的插桩工具进行指令计数来进行爆破, 但是我也看到有一些师傅使用钩子来获得信息的一些思路, 甚至于做了一些vmp的逆向, 师傅们tql.
出题思路
首先py......
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<p class="post-meta" style="margin: 10px 0;">
Posted by marginal on
2022-01-04
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<a href="/tags/#CTF-reverse" title="CTF-reverse">CTF-reverse</a>
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l3hctf_part_wp
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double-joy 和 load
double-joy
找到具体加密函数:
12345678910111213141516__int64 __fastcall sub_558A3CFB3D90(__int64 *a1){ __int64 v1; // rcx __int64 i; // rsi __int64 v3; // rax v1 = *a1; for ( i ......
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Posted by marginal on
2021-11-17
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<a href="/tags/#CTF-reverse" title="CTF-reverse">CTF-reverse</a>
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强网拟态
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HaHaHaHa
找到关键代码在mainactivity中.
输入处理:
1234567byte[] v7_1 = a.c(v1_1[v6]);.... while(v9 < v7_1.length) { v10 = v10 << 1 | (v7_1[v9] & 0x80) >>> v2; ......
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Posted by marginal on
2021-10-25
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pwn_start
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pwn入门 level题目
level0:
栈溢出
12345from pwn import *r=remote('node4.buuoj.cn', xxxxx)payload = b'a' * (0x80 + 8) + p64(0x0000000000400596)r.sendline(payload)r.interactive()
level1:......
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Posted by marginal on
2021-10-04
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<a href="/tags/#pwn-ctf" title="pwn-ctf">pwn-ctf</a>
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