2020天翼杯比赛试题逆向apk
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=
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
s = [13, 0, 0, 0, 144, 0, 0, 0, 129, 0,
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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(xx32 + 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!}
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。 零基础的我一脸茫然 请问下有题目连接吗？ 这是假flag吧，也不是正确答案啊。也不说一下还没搞完？ 虽然我也不知道是什么 但看起来很厉害的样子
谢谢分享 emmm，不明觉厉 虽然我看不懂，但是不影响我给大佬点赞{:1_918:} 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。