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
/app/auth.log contains authentication logs. Detect suspicious activity: - Identify IP addresses with 10+ failed logins within 1 hour - Get the timestamp of the first failed login from that IP The timestamp is a hint for the flag. Log format: [YYYY-MM-DD HH:MM:SS] Failed login from IP_ADDRESS
Extract lines containing "Failed login" with grep
Use awk or cut to extract IP addresses
Count occurrences per IP with sort | uniq -c