高校战疫WP——天津垓
打开程序提示“由于找不到cygwin1.dl，无法继续执行代码。重新安装程序可能会解决此问题”
百度一下cygwin，发现是一个win下的命令行执行工具
下载安装该工具后运行此程序提示输入Authorize:
用IDA打开搜索字符串找到Authorize相关函数处，发现是一个简单运算比较，爆破即可
```
a=
b=list("Rising_Hopper!")
for x in range(18):
for i in range(0x20,0xff):
if(a==~(i & ord(b)) & (i | ord(b))):
print(chr(i),end='')
break
#Caucasus@s_ability
```
输入后又提示输入flag，但是没有找到相关运算，后来在sub_100401A6C函数中发现程序利用Authorize异或加密了一段16进制，于是写脚本提取
```python
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0x01]
str=list("Caucasus@s_ability")
for i in range(1045):
b^=ord(str)
with open("dec","wb") as f:
f.write(bytes(b))
```
提取后用IDA打开，按C键分析读汇编代码，发现程序取最开始的一堆mov的数据和0x4CE3做除法运算后和输入进行比较
```python
a=
for i in a:
print(chr(i//0x4CE3),end='')
```
写脚本得flag{Thousandriver_is_1000%_stronger_than_zero-one}
**** Hidden Message ***** 这个格式感觉不太对 xuenixiang 发表于 2020-3-9 15:03
这个格式感觉不太对
好了，没问题了，我浏览器有问题
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