RE
freestyle
fun1
fun2
re_easy_func
IEC
easyiec
carefulguy
MISC
玩坏的winxp
RE
freestyle
64位无壳程序
分析两个函数，fun1 and fun2 简单的数学题
fun1
fun2
解密脚本
for i in range(10000): if 4 * (3 * i //9 - 9) == 4400: print(i) #fun1 for s in range(1000): if 2 * (s % 56) == 98: print(s) #fun2fun2中提示使用最小可模除MD5
flag{31a364d51abd0c8304106c16779d83b1}
re_easy_func
压缩包有密码，注释中有16进制，转换为png图片
import binascii payload = 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# payload为十六进制字符串，如：“ffd8ffe111e0457869...”；经过如下代码转换，可将pic存储为图片形式并可以正常打开
f=open("1.png","ab") # filepath为你要存储的图片的全路径
pic = binascii.a2b_hex(payload.encode())
f.write(pic)
f.close()开一下脑洞尝试一下就能解开（出题人的脑洞。。。）3CF8
得到两个文件
第一个32位无壳
有花指令，nop掉花指令
因为ida无法直接将它识别为一个主函数，从函数头上按p加一个主函数
两端数据，隔一个异或一个
exp
str = [ 0x64, 0x71, 0x54, 0x54, 0x64, 0x78, 0x74, 0x78, 0x64, 0x41,0x40, 0x48, 0x70, 0x6D, 0x18,0x4A,0x41,0x78,0x66,0x72,0x41,0x78,0x5e,0x4e,0x5d,0x52,0x0e,0x3d]
for i in range(0,len(str),2):
str[i] = str[i] ^ 0x37
print(bytearray(str))SqcTSxCxSAwHGm/JvxQrvxiNjR9=
第二个64位无壳
base换表
import base64
data ='SqcTSxCxSAwHGm/JvxQrvxiNjR9'
T1 ='FeVYKw6a0lDIOsnZQ5EAf2MvjS1GUiLWPTtH4JqRgu3dbC8hrcNo9/mxzpXBky7+'
T2 ='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
result =''
for ch in data:
result += T2[T1.index(ch)]
s = bytearray(base64.b64decode(result + "="))
print(s)flag{we1come_t0_wrb}
IEC
easyiec
追踪tcp流
flag{e45y_1eci04}
carefulguy
tcp.stream eq 3 之后有flag
16进制转字符串
from binascii import *
flag='666c61677b7034757333313576337279316e7433726573746963397d'
a = a2b_hex(flag)
print(a)flag{p4us315v3ry1nt3restic9}
MISC
玩坏的winxp
用DiskGenius打开vmdk文件
找到这个图片
binwalk分离，分离出一个flag.png,再继续分离，出来一个加密压缩包
但是从虚拟磁盘镜像中没有看到安装过qq所以就可能在线登录过，找一下firefox中的东西
.sqlite文件可以使用Navicat建立连接，在places.sqlite中找到qq账号
在空间留言板上找到这个
md5解密
压缩包解密