2018/12/02-南京邮电大学网络攻防训练平台-WxyVM

Posted 2021-01-24 fingerprint

题目链接：https://pan.baidu.com/s/1ihUShawo9-21IwSYhq7NiA  　　密码：jrou

题目逻辑很简单，将输入在函数sub_4005B6()进行处理，然后和dword_601060数组中的数据比较。

看一下，sub_4005B6函数，逻辑也很简单。

我们把byte_6010C0处存放的15000个数据dump下来，然后写脚本即可得到flag。

arr = open("E://data","rb").read()
flag = [0xc4,0x34,0x22,0xb1,0xd3,0x11,
        0x97,0x07,0xdb,0x37,0xc4,0x06,
        0x1d,0xfc,0x5b,0xed,0x98,0xdf,
        0x94,0xd8,0xb3,0x84,0xcc,0x08]
for i in range(14997,-1,-3):
    a = arr[i]
    b = arr[i+1]
    c = arr[i+2]
    if(a == 1):
        flag[b] -= c
        flag[b] = flag[b]&0xff
    if(a == 2):
        flag[b] += c
        flag[b] = flag[b] & 0xff
    if(a == 3):
        flag[b] ^= c
        flag[b] = flag[b] & 0xff
    if(a == 4):
        flag[b] /= c
        flag[b] = flag[b] & 0xff
    if(a == 5):
        flag[b] ^= flag[c]
        flag[b] = flag[b] & 0xff
print(‘‘.join(map(chr,flag)))