SCTF is a CTF contest hold by XCTF ( seems like a Chinese version's CTFtime.org ). Teaming up with my labmates, we have a lot of fun solving the challenges, and scored 2161 pts with the final rank 13/659.
Similar with Pwn200, Pwn400 gave us a binary file, but no libc.so. Open it with IDA Pro and analyze it, we found some information:
Code400 gave us a python script
Talentyange gives lots of tedious apks and you know how bad he is now. Let's try some interesting geography knowledge.
nc 22.214.171.124 29995 / nc 126.96.36.199 29995
Different people see different me.
But I am always myself.
Make the output of your program exactly the same as your source code.
All 5 correct required to get this flag (Only need 3 correct for BabyPolyQuine)
gcc (Ubuntu 4.8.2-19ubuntu1) 4.8.2
ruby 1.9.3p484 (2013-11-22 revision 43786) [x86_64-linux]
This is perl 5, version 18, subversion 2 (v5.18.2) built for x86_64-linux-gnu-thread-multi