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
Correlate `web.log`, `auth.log`, and `db.log` by session ID to reconstruct the intrusion from the web attack through successful authentication to database access. Retrieve the flag from the final database result row.
In web.log find SQLi/path-traversal traces plus the attacker IP and session id
Follow that session id in auth.log to see the successful intrusion
Follow the same session id in db.log; the final data-exfil line holds the flag