Last weekend I played DEF CON CTF Quals 2020 with team A*0*E, having so much fun with my teammates and I successfully solved a shellcode challenge called nooopsled. At last 7 teams solved this challenge and you can download the files from OOO’s github repo).
This is a challenge in the format of golf 🏌️♂️, you can see the description of this new type of challenge on OOO’s official webpage). For short, we are required to input a shellcode in the length of 1024 bytes, in the architecture of RISC-V64 or arm64. The server will receive our shellcode and start to execute it from the index of 0, 1, 2 …..1024, and record the number of success attempt to read out the
flag file. The error threshold start from 1, and increase 1 every 84 seconds. Every team have 8 hours for preparing their shellcode.