2021长安“战疫”网络安全卫士守护赛 misc部分writeup
- 八卦迷宫
- 朴实无华的取证
- 西安加油
- ez_Encrypt
一百多名，我觉得还行欸，多亏了队里的crypto手
八卦迷宫
签到题，走迷宫，换成字就可以了
朴实无华的取证
老规矩先看pslist
进程里面有文本查看器，360压缩和图片查看器
cmd运行过的程序也可以印证，发现有flag.zip和flag.png
λ volatility_2.6_win64_standalone.exe -f D:\download\xp_sp3\xp_sp3.raw --profile=WinXPSP2x86 cmdline
filescan取出flag.zip和flag.png
λ volatility_2.6_win64_standalone.exe -f D:\download\xp_sp3\xp_sp3.raw --profile=WinXPSP2x86 dumpfiles -Q 0x00000000017ad6a8 -D ./
Volatility Foundation Volatility Framework 2.6
DataSectionObject 0x017ad6a8 None \Device\HarddiskVolume1\Documents and Settings\Administrator\妗岄潰\flag.zip
SharedCacheMap 0x017ad6a8 None \Device\HarddiskVolume1\Documents and Settings\Administrator\妗岄潰\flag.zipλ volatility_2.6_win64_standalone.exe -f D:\download\xp_sp3\xp_sp3.raw --profile=WinXPSP2x86 dumpfiles -Q 0x0000000001e65028 -D ./ -n
Volatility Foundation Volatility Framework 2.6
DataSectionObject 0x01e65028 None \Device\HarddiskVolume1\Documents and Settings\Administrator\妗岄潰\flag.png
flag.zip导出有损坏，可以winrar用自带的修复
密码是在记事本里面20211209
encrypt.txt的内容
//幼儿园水平的加密（部分）
void Encrypt(string& str)
{for(int i = 0; i < str.length(); i++){if(str[i] >='a'&& str[i]<='w')str[i]+=3;else if(str[i]=='x')str[i]='a';else if(str[i]=='y')str[i]='b';else if(str[i]=='z')str[i]='c'; else if(str[i]=='_')str[i]='|';str[i] -= 32;}
}flag.png内容
FDCB[8LDQ?ZLOO?FHUHDLQOB?VXFFHHG?LQ?ILJKWLQJ?WKH?HSLGHPLF]
解密脚本
e = "FDCB[8LDQ?ZLOO?FHUHDLQOB?VXFFHHG?LQ?ILJKWLQJ?WKH?HSLGHPLF]"
d = ""
for i in e:i = chr(ord(i)+32)if 'd'<=i<='z':i = chr(ord(i)-3)elif i=='a':i='x'elif i=='b':i='y'elif i=='c':i='z'elif i=='|':i=='_'d += i
print(d)
cazy{Xian_will_certainly_succeed_in_fighting_the_epidemic}
西安加油
发现http流里面有secret.txt
导出
base64解密（https://the-x.cn/base64），发现是压缩包
里面是一堆图片，看起来是要拼图
montage和gap安装使用时参考的博客
https://blog.csdn.net/m0_47643893/article/details/113778577
https://www.cnblogs.com/bhxdn/p/14094717.html
https://github.com/nemanja-m/gaps
先把图片合成一张
sudo apt-get install montage
montage *.png -tile 8x6 -geometry +0+0 flag.png
然后用gaps拼图
gaps --image=../flag.png --size=100 --save
cazy{make_XiAN_great_Again}
当时只出了三条……
ez_Encrypt
导出http流可以发现最后有个web123
再向上看，分析蚁 剑 命令执行的流量
cd "/var/www/html/public";base64 www.zip > web123;echo [S];pwd;echo [E]
是吧www.zip的备份base编码成web123了
转成zip
然后比赛时候我就卡住了，其实联系题目里的Encrypt，可以猜想是用了什么加密函数。
D盾扫描一下就找到了
# \app\controller\index.php
<?php define('IKlSux1227',__FILE__);$DusPFr=base64_decode("bjF6Yi9tYTVcdnQwaTI4LXB4dXF5KjZscmtkZzlfZWhjc3dvNCtmMzdqZHF0d3lpT2VBY1VaTHBDdUhuYm1ndkZzZlNhUFlsTUpCTmpSVmtLeFFEVFdJcnpFb1hHaA==");$arCiCL=$DusPFr[3].$DusPFr[6].$DusPFr[33].$DusPFr[30];$VvUrBZ=$DusPFr[33].$DusPFr[10].$DusPFr[24].$DusPFr[10].$DusPFr[24];$DEomKk=$VvUrBZ[0].$DusPFr[18].$DusPFr[3].$VvUrBZ[0].$VvUrBZ[1].$DusPFr[24];$LnpnvY=$DusPFr[7].$DusPFr[13];$arCiCL.=$DusPFr[22].$DusPFr[36].$DusPFr[29].$DusPFr[26].$DusPFr[30].$DusPFr[32].$DusPFr[35].$DusPFr[26].$DusPFr[30];eval($arCiCL("JFZDQlpRVz0iZ29NVFFoZXFpYVVPdWJtWWZSSlNya1dObmRFc1BaR2pBS3BDVnRCSUh3REZ4Y3pYTGx2eVlUY2lVdVBuZ3BzeXFib09saGpGSVpOU3d6bU1IR3ZEeHRrWFZhV2ZkQUpFclJLTENCUWVISjlBcGR4WUd2Vm9wTjVCdFh6WmhCdXVwWmZyY0RmM2plcmpGMnJpekxZcmNEZjN0aU1aR21qbmkwOWpITmp1UjJzMlNFOVpHTlNRR3ZzVGZvam5oREdHcGlCME5WaE5PMmhxc0x6dVZtWjBpRXVYU3ZoT2hEVkNwQmtLTzIxMHAxazZidkdwVjJ1bk9LU1p6WjVKenYxU1BvaHJPMXo0ekV6cWlEVkdjMUdVVnYxQXMxU3ZVWjVzRkVrVFZaVk1iVkVMR0VqRGJCZktWMHVBek5tQXpkekZoVmtrc05ycGIxek9wRWhwVktCdlZEV1podkVMc0JHaUdLMDlmZ1o3am1rM2JadTFWSzBaR21qbmkwOWpOS1N6Q2doWlVva0hpMEJiU0IwcWp2aFhwWjlIRlZNS2MxMHFqdmhYcFo5SEZWTUtjRTA3amRHaGl2emRGSzBaR21qbmkwOWpOS2NLTEY0Wkdtam5pMDlqTkttQUxGNFpHbWpuaTA5ak5LZjBMRjRaR21qbmkwOWpOS21BTEY0Wkdtam5pMDlqTktmMExpTVpOTkdNendHc0hGaDJzc3J3aDBhYmNFMHFqdmhYcFo5SEZWTXJ5RTBxanZoWHBaOUhGVk1LTEY0WnpCRWNHMHpDTktXekNnaDJzc3J3aDBhYmNWMHFqdmhYcFo5SEZWTWVTRTA3anYxRVVWRXZPSzBaR21qbmkwOWpOS3p6Q2doWlVva0hpMEJiY2lTenllaHR6MjVmelZScUhGaFpVb2tIaTBCYmNEanpDZ2haVW9rSGkwQmJjS0d6Q2doWlVva0hpMEJiY0RCekNnaFpVb2tIaTBCYmNER3pDZ2haVW9rSGkwQmJjS1d6Q2doWlVva0hpMEJiY0tqekNnaFpVb2tIaTBCYmNLVnpDZ2haVW9rSGkwQmJjREd6Q2doWlVva0hpMEJiY0tXenkyVjJPTkFUam1rM2JadTFWZVlnRlpWcGlWVHJSZGtOcERXa1ZFVjBSQlRlU0xoc2hOck1zTnJwcEJqT05vQlpoTmhFR05hVE9WR05HbWpaVjFUS1YwenZTVmphUEVWREZtNTVOWnpBaHZmZXBFalZjb3JpczJyTVNFVUtoWjlWaFZqSlZ2NU16VlRBekVXZ2hOdUZPS2pwczFaS05CekJidmhTVlpWeXBWQk5SSldwVk5yTk9EV05oMVZkYkVoZ1ZOVUtWRXVYUHZWZHNCQlpWb3JlczIxQVBORUVoWmpCcG9yTVZCVjRwdlZWaEJ1eWhKV2tpS2pOY0JCTHoyOXRQRFlJRndaMHAxU3FHZFZpRkVHT0YwU0ZjQlZWUHY1RmNkU1FGWkdNYk5qZk5Eak5VMnpJc29hNGJCenFpQnpjVTFqMHNCVnZzQmphaUxFU3BOYUtGWkdNYk5qZk5Eak5VMnpJc29hNGJCenFpQnpjVTFqMHNCVnZzQmphaUxTdGhLRXZzVkd2aDFCNXAzU3Rob3JhT1p1cGNCR0pHMmFGcDN1cVYyNXlWMHJtVUxTdGhLRXZzVkd2aDFCNXAzV0NzMk0zZmdaa3lLOCtISjlBcGR4WUd2Vm9wTjVCdFh6ZEdOU3RiczRyY0RmM2plcmpGMnJpekxZcmNEZjN0aU1aaEJrUVBtajBITmp1UjJzMlNFOVpHTlNRR3ZzVGZvam5oREdHcGlCME5WaE5PMmhxc0x6dVZtWjBpRXVYU3ZoT2hEVkNwQmtLTzIxMHAxazZidkdwVjJ1bk9LU1p6WjVKenYxU1BvaHJHc1ZaVnZtZVNMekRiRVQyT0tFRk52aGFWWmhWYm1HME9OMVROTkVPYkVFWmNOclVzS1dGekJFSWJtYU5WMEduc1ZzMXBWalZwZFNwRm1HdXNvNUZjVmhkTm81c3NpMDlmZ1o3anYxcVYydWlGSjBaaEJrUVBtajBOS1N6Q2dodk5vOTRVd2hiU0IwcWptR3BiM3VYekVNS2MxMHFqbUdwYjN1WHpFTUtjRTA3akVHR1YyUzRHSjBaaEJrUVBtajBOS2NLTEY0WmhCa1FQbWowTkttQUxGNFpoQmtRUG1qME5LZjBMRjRaaEJrUVBtajBOS21BTEY0WmhCa1FQbWowTktmMExpTVpPTkdWekJ6c0hGaE5OVnpEUHZoYmNFMHFqbUdwYjN1WHpFTXJ5RTBxam1HcGIzdVh6RU1LTEY0WlZCQkxPM3VaTktXekNnaE5OVnpEUHZoYmNWMHFqbUdwYjN1WHpFTWVTRTA3anZCWnoyclNzSzBaaEJrUVBtajBOS3p6Q2dodk5vOTRVd2hiY2lTenllaGFiQnpUczBZcUhGaHZObzk0VXdoYmNEanpDZ2h2Tm85NFV3aGJjS0d6Q2dodk5vOTRVd2hiY0RCekNnaHZObzk0VXdoYmNER3pDZ2h2Tm85NFV3aGJjS1d6Q2dodk5vOTRVd2hiY0tqekNnaHZObzk0VXdoYmNLVnpDZ2h2Tm85NFV3aGJjREd6Q2dodk5vOTRVd2hiY0tXenkyVjJPTkFUanYxcVYydWlGWFlnRlp6cHMxVnFzRGhHUERXa1ZOYTRpMmhJY2loQmJOdW5zWlZwc3ZoRUZCekZjc0d1czF1WnpWa2RjTEJnaEJqTnNpVzBob0VMR3YxQlZvcnJWaVN5UEVFTlVaYVpObWprczB6TnBFenZHZGpnYzFmMXMxek1SQlpyaW81R1ZzRzRPREVGT1ZWRUd2ckZWTGhKVm1zcnMyU2RTVmpOY0JrS3NaR01oRWhJTndrWmNEbTJWMEdwY0JTZFJ2Qk5ORU8wczI1dHN2RWRzRGpoVnZySnMyNU5WMmp2VkJTRFZCanZPMmFNVTJjQXlza2dwM2hmTzFWdHB2U0xpRFNOVm1acmlzenZzMDlPUkVHRmNzamRPRFd0cDJqRWNMQmlWS1Zjc0RTdlUxQk9ob2twYlo1NXMxUjFibTFuYmRFc05FR2pPVkdORkVaZVNOdVpjM1dLTm9ydEZvVnFpd0JpVlo1Y3NaUjFSVmpWR0VFeWhMaGZWc2hGaUJmclV3RUZORUdlc2lqTnMyU05pWkdOY3ZyQVZCVjRjRWpNVkxCR2MzV3ZPMmEwUjJWRUZvYWhjZGhhVm9heXB2aE5VQmtOVk5oMUdKVzBGRWpzaEJHVnAyYTNzMk00U05FSXptdWdiTFd2c0RFV2N2amRObzlnaExoYVZvYXlpdmhPUmRTaWNCa0xzaVcwYlZHSWlacnBiZFdrc0JHTWhFVEFWQldTVnNreUdFelRwMVNmaGlWWk5FamhHbUdORnMwclJkV0dWMWt5VkV6NHp2am5HdjFMVkJrbXNLanBWMW1BenYxTnAwNWNOb3JwaEVjS1ZCRXVic1Y1VnNWcEYxVUtoREdpYlpra09vMTRGRVNkR3Z1U2J2UzVzMXVFU05FRVZCV2lWMnJ2c0RFWnAxU2ZoaVZaTkVqaEdtR05GczByUmRXR1Yxa3lWRXo0enZFbUd2MUxWQmttc0tqcFYxbUF6djFOcDA1SE5CekZoRWNlTkJ6aGNkaGFWb2F5aXZoVnBkVnNORUdoc29yTk5CR01iRUVTYm1mMk8za2pTVkdFemR1WmgycmNzWlZNT1ZVZVNOcnBjZGg0TkRqdEZzMXFod0VpY0VqdE9WR05zRU9BaUJqU3BCanFzS1NaU29qRXp2MU5wMDVjR0VoWFIxa01iRXpoY2RoYVYyYXRpQlVBcEpHaXBLQmVzaVdOaVZWZFJka1NjMWprVkJoamNFbWVWQmhaaEVUMFZEajBVMUdOaFprWmJFR3BzaWp0YlZ6Tk5aaGljQmt1aURqcE5CR0lpWnJwYkVrbXNLanBWMW1laEJTVmhtanlPMmFUUlZjZU5aNVpjMDU1Tk5rTlNtMU5SbXJOYzBzMVYwVkFzb2h2c3dqVmh2dW5OVmhFU1ZzZXptak5wMGtlc1ZHQWkyRTZGd3VWTnZ1NU9va05TdlNhU0pFQkZtazFpQnVUUE5qbmJtQlZjM1dLc0tqcFYxbUF6SkVTaDN1SE5Cemh5c0JuenZyWmJzR0tGMFNEQzFXa08zVnRoS0UxVkRqVFZFU0pHMmFOYnZyT05pU1RwMGFKc291cGJFT2VWREVoYjBrZE5CU1ZiQmYwTkxCM3AyRUxzRFNnaGlFc0Yya2pSbXJKc291cGJFT2VWREVoYjBrZE5CU1ZiQmYwTkxCM3AyRUxzRFNnaGlFc2ltU0ZSRWtmR2RTc1ZaMUFpbVNGcEVrTVZEak5jVkVRRlp6cHMxVnFzRGhHUEx6M2ltU0ZSRWtmR2RTc1ZaMUFGMVNJUm05M0hpMGd0Rlo3SEs0PSI7ZXZhbCgnPz4nLiRhckNpQ0woJFZ2VXJCWigkREVvbUtrKCRWQ0JaUVcsJExucG52WSoyKSwkREVvbUtrKCRWQ0JaUVcsJExucG52WSwkTG5wbnZZKSwkREVvbUtrKCRWQ0JaUVcsMCwkTG5wbnZZKSkpKTs="));?>
https://www.zhaoyuanma.com/phpjm.html这个网站可以在线解密
得到flag 'cazy{PHP_ji4m1_1s_s00000_3aSyyyyyyyyyyy}'
