Clear it in 3 steps
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Start the environment
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Investigate the target
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Submit the flag
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System Call Tracing - strace Debugging
Mission
Analyze `/challenge/strace.log`, a recorded trace of the source-less program `/app/mystery_program`. Find where it `openat`s a file in a hidden directory, then read the arguments of the following `read`/`write` calls to obtain the flag.
Hints
Hint 1 Show
Look at the paths in open/openat calls
Hint 2 Show
Find access to a hidden file (starting with .)
Hint 3 Show
The following read/write argument contains the flag