2020天翼杯比赛试题逆向apk

liujiajia123 · 发表于 2020-8-2 17:25

1.re类型的第一题是apk，反编译dex文件，发现其中并没有存在相关连的具体算法；
所以应该想到算法存在于lib文件夹下的.so文件中，利用搜索；
可以查看到对应的checkflag相关函数；从dex的反编译看；只要执行这一步成功就可以得到flag；
将.so文件加载到IDA中，我们可以发现对应的算法；
v5为输入的flag；v6和v7是x和xx两个数组的逻辑是将每一个输入与xx数组做乘法；然后结果相加，
判断是否等于x数组的值；
应为每一个v6都是由32个未知的flag得到的，可以把他考虑成一个解32元一次方程，使用math库的solve函数可以解多元一次方程；

2.提取对应xx的值进行处理；

3.提取对应x数组的值为；
  x=[201711,  208667,  203854,  205935,  196952,  211952,  189384,  174521,  197444,  202569,  184416,  186751,  214509,  220072,  161059,  225949,  203349,  210431,  168832,  208291,  212829,  220012,  191145,  205850,  176410,  198189,  200769,  210976,  178739,  205545,  196557,  230918]
3.利用对应的脚本求解为# -*- coding: utf-8 -*-
# @Time : 2020/7/31 16:30
# @AuThor  : liujiajia123
# @file : chall.py

import numpy as np

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   98, 0, 0, 0, 139, 0, 0, 0, 85, 0,
   0, 0, 80, 0, 0, 0, 106, 0, 0, 0,
   55, 0, 0, 0, 41, 0, 0, 0, 42, 0,
   0, 0, 149, 0, 0, 0, 145, 0, 0, 0,
   12, 0, 0, 0, 74, 0, 0, 0, 18, 0,
   0, 0, 132, 0, 0, 0, 72, 0, 0, 0,
   121, 0, 0, 0, 138, 0, 0, 0, 97, 0,
   0, 0, 104, 0, 0, 0, 74, 0, 0, 0,
   40, 0, 0, 0, 81, 0, 0, 0, 33, 0,
   0, 0, 103, 0, 0, 0, 113, 0, 0, 0,
   85, 0, 0, 0, 32, 0, 0, 0, 29, 0,
   0, 0, 146, 0, 0, 0, 88, 0, 0, 0,
   27, 0, 0, 0, 137, 0, 0, 0, 36, 0,
   0, 0, 126, 0, 0, 0, 32, 0, 0, 0,
   56, 0, 0, 0, 37, 0, 0, 0, 29, 0,
   0, 0, 82, 0, 0, 0, 89, 0, 0, 0,
   79, 0, 0, 0, 100, 0, 0, 0, 87, 0,
   0, 0, 72, 0, 0, 0, 90, 0, 0, 0,
   93, 0, 0, 0, 68, 0, 0, 0, 87, 0,
   0, 0, 52, 0, 0, 0, 75, 0, 0, 0,
   138, 0, 0, 0, 122, 0, 0, 0, 138, 0,
   0, 0, 84, 0, 0, 0, 141, 0, 0, 0,
   13, 0, 0, 0, 59, 0, 0, 0, 113, 0,
   0, 0, 102, 0, 0, 0, 119, 0, 0, 0,
   137, 0, 0, 0, 55, 0, 0, 0, 27, 0,
   0, 0, 146, 0, 0, 0, 52, 0, 0, 0,
   18, 0, 0, 0, 65, 0, 0, 0, 78, 0,
   0, 0, 44, 0, 0, 0, 135, 0, 0, 0,
   139, 0, 0, 0, 88, 0, 0, 0, 107, 0,
   0, 0, 138, 0, 0, 0, 116, 0, 0, 0,
   16, 0, 0, 0, 44, 0, 0, 0, 100, 0,
   0, 0, 139, 0, 0, 0, 101, 0, 0, 0,
   13, 0, 0, 0, 76, 0, 0, 0, 68, 0,
   0, 0, 17, 0, 0, 0, 56, 0, 0, 0,
   74, 0, 0, 0, 72, 0, 0, 0, 27, 0,
   0, 0, 102, 0, 0, 0, 28, 0, 0, 0,
   70, 0, 0, 0, 108, 0, 0, 0, 46, 0,
   0, 0, 39, 0, 0, 0, 34, 0, 0, 0,
   46, 0, 0, 0, 142, 0, 0, 0, 17, 0,
   0, 0, 141, 0, 0, 0, 60, 0, 0, 0,
   52, 0, 0, 0, 103, 0, 0, 0, 136, 0,
   0, 0, 70, 0, 0, 0, 20, 0, 0, 0,
   102, 0, 0, 0, 147, 0, 0, 0, 98, 0,
   0, 0, 55, 0, 0, 0, 17, 0, 0, 0,
   14, 0, 0, 0, 33, 0, 0, 0, 77, 0,
   0, 0, 134, 0, 0, 0, 147, 0, 0, 0,
   75, 0, 0, 0, 124, 0, 0, 0, 60, 0,
   0, 0, 82, 0, 0, 0, 116, 0, 0, 0,
   26, 0, 0, 0, 146, 0, 0, 0, 49, 0,
   0, 0, 110, 0, 0, 0, 44, 0, 0, 0,
   128, 0, 0, 0, 54, 0, 0, 0, 147, 0,
   0, 0, 107, 0, 0, 0, 58, 0, 0, 0,
   66, 0, 0, 0, 143, 0, 0, 0, 24, 0,
   0, 0, 90, 0, 0, 0, 22, 0, 0, 0,
   92, 0, 0, 0, 139, 0, 0, 0, 73, 0,
   0, 0, 141, 0, 0, 0, 129, 0, 0, 0,
   134, 0, 0, 0, 84, 0, 0, 0, 27, 0,
   0, 0, 62, 0, 0, 0, 46, 0, 0, 0,
   34, 0, 0, 0, 58, 0, 0, 0, 144, 0,
   0, 0, 43, 0, 0, 0, 136, 0, 0, 0,
   107, 0, 0, 0, 11, 0, 0, 0, 82, 0,
   0, 0, 95, 0, 0, 0, 24, 0, 0, 0,
   117, 0, 0, 0, 57, 0, 0, 0, 113, 0,
   0, 0, 73, 0, 0, 0, 44, 0, 0, 0,
   91, 0, 0, 0, 141, 0, 0, 0, 44, 0,
   0, 0, 60, 0, 0, 0, 128, 0, 0, 0,
   142, 0, 0, 0, 96, 0, 0, 0, 57, 0,
   0, 0, 127, 0, 0, 0, 60, 0, 0, 0,
   74, 0, 0, 0, 54, 0, 0, 0, 138, 0,
   0, 0, 119, 0, 0, 0, 118, 0, 0, 0,
   61, 0, 0, 0, 130, 0, 0, 0, 146, 0,
   0, 0, 11, 0, 0, 0, 65, 0, 0, 0,
   92, 0, 0, 0, 82, 0, 0, 0, 60, 0,
   0, 0, 114, 0, 0, 0, 54, 0, 0, 0,
   139, 0, 0, 0, 148, 0, 0, 0, 84, 0,
   0, 0, 110, 0, 0, 0, 141, 0, 0, 0,
   142, 0, 0, 0, 84, 0, 0, 0, 21, 0,
   0, 0, 70, 0, 0, 0, 54, 0, 0, 0,
   120, 0, 0, 0, 48, 0, 0, 0, 93, 0,
   0, 0, 104, 0, 0, 0, 98, 0, 0, 0,
   39, 0, 0, 0, 103, 0, 0, 0, 29, 0,
   0, 0, 104, 0, 0, 0]
xx = []
for i in range(0, len(s), 4):
xx.append(s)

x = [201711,
   208667,
   203854,
   205935,
   196952,
   211952,
   189384,
   174521,
   197444,
   202569,
   184416,
   186751,
   214509,
   220072,
   161059,
   225949,
   203349,
   210431,
   168832,
   208291,
   212829,
   220012,
   191145,
   205850,
   176410,
   198189,
   200769,
   210976,
   178739,
   205545,
   196557,
   230918]
sum=''
a = []
for i in range(0, 32):
a.append([])
for j in range(0, 32):
      a.append(xx[i * 32 + j])
a = np.array(a)
b = np.array(x)
x = np.linalg.solve(a, b)
s = [70, 65, 75, 69, 123, 116, 104, 49, 53, 95, 49, 53, 95, 110, 48, 55, 95, 55, 104, 51,
   95, 114, 51, 52, 49, 95, 102, 49, 52, 103, 33, 125]
for i in s:
   sum+=chr(i)
   print(sum)

# FAKE{th15_15_n07_7h3_r341_f14g!}

Deuez · 发表于 2020-8-2 17:43

提示: 作者被禁止或删除内容自动屏蔽

liujiajia123 · 发表于 2020-8-4 21:05

test1550 发表于 2020-8-3 01:19
这个明显是错的，正确的flag要用跟踪，用内存的值dump出来才可以解出。

我就是从.so文件中提取的字符串，进行拼凑出来的。

冥鹿 · 发表于 2020-8-2 19:40

零基础的我一脸茫然

Shocker · 发表于 2020-8-2 19:51

请问下有题目连接吗？

psych1 · 发表于 2020-8-2 21:37

这是假flag吧，也不是正确答案啊。也不说一下还没搞完？

鎏丿情何以堪 · 发表于 2020-8-2 21:50

虽然我也不知道是什么但看起来很厉害的样子

巴黎、的小手 · 发表于 2020-8-2 23:33

谢谢分享

hwhj · 发表于 2020-8-2 23:49

emmm，不明觉厉

梦魇_Hex · 发表于 2020-8-2 23:57

虽然我看不懂，但是不影响我给大佬点赞

test1550 · 发表于 2020-8-3 01:19

这个明显是错的，正确的flag要用跟踪，用内存的值dump出来才可以解出。

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