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Signal VM de1ta (Part 2) - de1CTF 2019

R3x
2019-08-09
Reversing / Linux

tl;dr

  • Challenge is a VM implemented over signals and ptrace
  • Reverse Instruction types and implementation
  • Use gdb scripting to find the executed code and get the pseudo VM code
  • Find out the algorithm (Max triangle sum) from VM instructions
  • Find an more optimized way to solve the problem (Or lazy solve it!).
Read More
VM Reversing Linux Automation

Signal VM (Part 1) - de1CTF 2019

R3x
2019-08-08
Reversing / Linux

tl;dr

  • Challenge is a VM implemented over signals and ptrace
  • Reverse Instruction types and implementation
  • Use gdb scripting to find the executed code and get the pseudo VM code
  • Reverse the VM functionality (Hill cipher) for flag and profit
Read More
VM Reversing Linux Automation

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