https://crackmes.one/crackme/5b81014933c5d41f5c6ba944

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Determine the file type

Use the file command to determine the file type

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Test the program

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Strings

Use strings to print the sequences of printable characters in files

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Analyze

Dissemble the program with GDB Peda

Set a breakpoint at the test instruction. Run the program and observe the registers.

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Test the program