0x00 题目分析

这题用MD5的

MD5的爆破理论上可行，但是实际操作可能要耗点时间

0x01 解

查壳省略，是个ELF程序

main函数非常长，很多移位什么的操作

直接去到最后看密文比较说不定还能知道是个啥

比较放别的函数去了

在这个sub_402370里

这个a14d89c38cd0fb2什么的很是可疑

看起来很像hash的结果

测试了一下应该是md5

应该是单个字符进行了两次md5加密

那没什么好说的，直接爆

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from hashlib import *
raw_data = [0x31, 0x34, 0x64, 0x38, 0x39, 0x63, 0x33, 0x38, 0x63, 0x64,
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            0x39, 0x35, 0x35, 0x61, 0x32, 0x39, 0x39, 0x36, 0x62, 0x66,
            0x00]
enc = []

tmp = ''
for i in raw_data:
    if i != 0x00:
        tmp += chr(i)
    else:
        enc.append(tmp)
        tmp = ''


table = []
table_md5 = []

# 将所有可打印字符都进行两次md5加密，存在一个表中
# 可打印字符也有一张表，和两次md5的表一一对应
for i in range(32, 127):
    table.append(chr(i))
    table_md5.append(md5((md5(chr(i).encode()).hexdigest()).encode()).hexdigest())

for i in range(len(enc)):
    print(table[table_md5.index(enc[i])], end='')

# Hello_Ctfer_Velcom_To_my_Mov_and_md5(md5)_world