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
All challenges
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Programming - C2 Traffic Analysis
Mission
beacon.log is generated from the FLAG injected at startup. Join Base64 payloads by seq and repeat-XOR with the first eight SHA-256 bytes of beacon-v1 to recover the flag.
Hints
Hint 1 Show
Inspect beacon.log and identify the target record
Hint 2 Show
join Base64 payloads by seq and repeat-XOR with the first eight SHA-256 bytes of beacon-v1
Hint 3 Show
Verify that the reconstructed value has FLAG{...} format