2021 长安“战疫”网络安全卫士守护赛 WriteUp
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麻薯星的zyz想要生猴子!!!麻薯星的zyz想要生猴子!!!麻薯星的zyz想要生猴子!!!
队友第一轮做了俩Web之后就摆烂了 寄
总体来说长安战疫基本大部分题都偏向入门，适合大一新生练练手
少部分多百度也能做。
还有很小部分就看积累吧。
文章目录
Misc
八卦迷宫
按照迷宫走然后取字的拼音即可
字是战长恙长战恙河长山山安战疫疫战疫安疫长安恙
flag是：
cazyzhanchangyangchangzhanyanghechangshanshananzhanyiyizhanyianyichanganyang
朴实无华的取证
首先查看版本 imageinfo得到WinXPSP2x86
然后pslist，注意到
于是：
发现目录是桌面而并非Desktop，重新filescan一下，导出有用信息
首先zip的密码是上面说的20211209
其次，得到的txt是加密函数，而密文在flag.png上。反过来写一个脚本
但是我写了几次都没写对
。。。。于是有了这个脚本
s = 'fdcb[8ldq?zloo?fhuwdlqob?vxffhhg?lq?iljkwlqj?wkh?hslghplf]'
for i in s:
if(ord(i)>=ord('a') and ord(i)<=ord('w')):
print(chr(ord(i)-3),end='')
elif(i == 'a'):
print('x',end='')
elif(i == 'b'):
print('y',end='')
elif(i == 'c'):
print('z',end='')
elif(i == "|"):
print('_')
else:
print(chr(ord(i)+32),end='')
#ca`_Xian_šill_certainl__s˜cceed_in_fighting_the_epidemic
查了一下certainl后面应该还有个y
然后前面那个单词是will，后面那个单词是succeed，于是得到flag提交正确
cazyXian_will_certainly_succeed_in_fighting_the_epidemic
无字天书
导出HTTP流，在导出的其中两个文件发现hex串，都是很明显的zip，hex–>ascii，得到zip，打开zip得到两文件，一个key.ws一个flag.txt
ws很明显的whitespace，直接https://vii5ard.github.io/whitespace/得到key:XiAnWillBeSafe
然后flag.txt很明显的SNOW
.\\SNOW.EXE -p XiAnWillBeSafe -C .\\flag.txt
cazyC4n_y0u_underSt4nd_th3_b0oK_With0ut_Str1ng
西安加油
查看流量包发现大量的base64串，导出http发现secret.txt，base64解码发现是zip，保存后打开发现是拼图
因为不知道大小，所以猜了一个12*4
命令montage *png -tile 12x4 -geometry 100x100+0+0 out2.png
然后用gaps
python3 gaps --image=out2.png --generations=10 --population=48 --size=100 --save
我gaps有问题，代数太多跑一会就报错，不加save跑完就直接报错。。。
得到flag，X的大小写记不住了
cazymake_XiAN_great_Again
binary
文件头能看出来是class文件，直接扔jadx
数组转出来
s = [77, 68, 65, 119, 77, 68, 65, 119, 77, 68, 69, 119, 77, 84, 69, 120, 77, 68, 65, 119, 77, 68, 65, 119, 77, 68, 65, 120, 77, 84, 69, 120, 77, 84, 69, 119, 77, 84, 69, 120, 77, 68, 65, 119, 77, 68, 65, 119, 77, 70, 120, 117, 77, 68, 69, 120, 77, 84, 69, 120, 77, 68, 69, 119, 77, 84, 69, 119, 77, 84, 65, 120, 77, 68, 69, 120, 77, 84, 69, 120, 77, 68, 65, 119, 77, 84, 69, 120, 77, 68, 69, 120, 77, 68, 69, 120, 77, 84, 69, 120, 77, 70, 120, 117, 77, 68, 69, 119, 77, 68, 65, 120, 77, 68, 69, 119, 77, 68, 65, 119, 77, 84, 69, 120, 77, 84, 65, 119, 77, 68, 69, 120, 77, 84, 65, 120, 77, 68, 69, 120, 77, 68, 69, 120, 77, 68, 69, 119, 77, 68, 65, 120, 77, 70, 120, 117, 77, 68, 69, 119, 77, 68, 65, 120, 77, 68, 69, 120, 77, 68, 65, 119, 77, 68, 65, 120, 77, 84, 65, 119, 77, 68, 69, 120, 77, 84, 65, 119, 77, 68, 65, 119, 77, 84, 65, 120, 77, 68, 69, 119, 77, 68, 65, 120, 77, 70, 120, 117, 77, 68, 69, 119, 77, 68, 65, 120, 77, 68, 69, 120, 77, 84, 65, 120, 77, 84, 65, 120, 77, 84, 65, 119, 77, 84, 69, 119, 77, 84, 69, 119, 77, 84, 65, 120, 77, 84, 69, 120, 77, 68, 69, 119, 77, 68, 65, 120, 77, 70, 120, 117, 77, 68, 69, 120, 77, 84, 69, 120, 77, 68, 69, 119, 77, 84, 69, 120, 77, 68, 69, 119, 77, 68, 65, 119, 77, 68, 65, 119, 77, 84, 65, 119, 77, 84, 65, 119, 77, 68, 65, 120, 77, 68, 69, 120, 77, 84, 69, 120, 77, 70, 120, 117, 77, 68, 65, 119, 77, 68, 65, 119, 77, 68, 69, 119, 77, 84, 65, 120, 77, 68, 69, 119, 77, 84, 65, 120, 77, 68, 69, 119, 77, 84, 65, 120, 77, 68, 69, 119, 77, 84, 65, 120, 77, 68, 65, 119, 77, 68, 65, 119, 77, 70, 120, 117, 77, 84, 69, 120, 77, 84, 69, 120, 77, 84, 69, 119, 77, 68, 69, 119, 77, 68, 65, 119, 77, 68, 65, 119, 77, 68, 69, 119, 77, 68, 69, 120, 77, 68, 65, 120, 77, 84, 69, 120, 77, 84, 69, 120, 77, 84, 69, 120, 77, 86, 120, 117, 77, 84, 69, 119, 77, 68, 65, 120, 77, 68, 69, 119, 77, 84, 65, 120, 77, 68, 65, 119, 77, 68, 69, 119, 77, 84, 69, 120, 77, 84, 69, 120, 77, 68, 69, 119, 77, 68, 65, 119, 77, 68, 65, 120, 77, 84, 65, 119, 77, 70, 120, 117, 77, 68, 69, 119, 77, 84, 69, 119, 77, 84, 65, 119, 77, 68, 69, 120, 77, 68, 65, 120, 77, 68, 65, 120, 77, 68, 65, 119, 77, 68, 69, 119, 77, 68, 69, 120, 77, 68, 69, 119, 77, 84, 65, 120, 77, 84, 69, 119, 77, 86, 120, 117, 77, 84, 65, 120, 77, 84, 65, 119, 77, 68, 65, 119, 77, 84, 65, 119, 77, 84, 69, 120, 77, 84, 65, 119, 77, 84, 69, 119, 77, 68, 65, 120, 77, 84, 65, 120, 77, 68, 65, 119, 77, 68, 65, 120, 77, 68, 65, 120, 77, 70, 120, 117, 77, 84, 69, 120, 77, 68, 69, 120, 77, 84, 69, 120, 77, 84, 69, 120, 77, 68, 65, 120, 77, 68, 69, 119, 77, 84, 69, 119, 77, 84, 65, 119, 77, 68, 69, 120, 77, 68, 69, 119, 77, 84, 65, 120, 77, 84, 69, 119, 77, 70, 120, 117, 77, 84, 65, 120, 77, 68, 69, 120, 77, 68, 65, 119, 77, 84, 69, 120, 77, 68, 65, 119, 77, 68, 65, 119, 77, 68, 69, 120, 77, 68, 69, 119, 77, 68, 65, 119, 77, 68, 65, 119, 77, 68, 65, 119, 77, 68, 65, 120, 77, 70, 120, 117, 77, 68, 69, 120, 77, 68, 69, 119, 77, 84, 65, 119, 77, 84, 65, 119, 77, 68, 69, 119, 77, 68, 65, 120, 77, 84, 65, 120, 77, 84, 69, 119, 77, 84, 65, 120以上是关于2021 长安“战疫”网络安全卫士守护赛 WriteUp的主要内容，如果未能解决你的问题，请参考以下文章