HECTF 2020 Writeup

Misc

【真签到题】快来看直播啦~

打开直播间,即可在直播画面内找到flag

因此flag为 HECTF{狮虎萌轻一点打出题人好吗嘤嘤嘤}

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MoeCTF 2020 Writeup

Author: JiJi, XiaoZhuo, Accelerat0r. All rights reserved.

Reverse

Welcome To Re!

下载得到一个 Signin.zip 的压缩包,解压后找到ELF文件,用ida64反编译后得到

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int __cdecl main(int argc, const char **argv, const char **envp)
{
char s2[8]; // [rsp+0h] [rbp-70h]
char s1; // [rsp+30h] [rbp-40h]
unsigned __int64 v6; // [rsp+68h] [rbp-8h]
v6 = __readfsqword(0x28u);
strcpy(s2, "moectf{W3lc0me-T0_th3-W0rld_Of_R3v3rsE!}");
puts("Welcome to MoeCTF! --by Reverier\nPlease Input your flag and I will check it:");
__isoc99_scanf("%41s", &s1);
if ( !strcmp(&s1, s2) )
puts("Congratulations!");
else
puts("Ruaaaaaaaaaaaaa~~~Wrong!");
return 0;
}

因此flag为 moectf{W3lc0me-T0_th3-W0rld_Of_R3v3rsE!}

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