https://ctflearn.com/challenge/990
Determine the file type
Use the file command to determine the file type
Test the program
Strings
Use strings to print the sequences of printable characters in files
Analyze
Dissemble the program
Using Ghidra we can see that the program utilizes the strcmp function with a userinput and flag.
Use GDB-Peda to analyze the program
Enter start to set a breakpoint at the main function.
Dissemble the main function and find the strcmp function.
Set the 2nd breakpoint at the strcmp function and run gdb.
The flag is stored in the RDI register.
Test the program
Persecure : my learning archive 