When a standard SQL injection fails to return data directly, attackers use a strategy. The command WAITFOR DELAY '0:0:5' tells a Microsoft SQL Server (MSSQL) to halt execution for exactly five seconds. The "story" of the attack unfolds as follows:

: If the server takes 5 seconds to respond, the condition is true .

: By repeating this thousands of times for every character in every table, an automated tool like SQLMap can reconstruct entire databases character by character. Why This Specific Payload? Blind SQL Injection | OWASP Foundation

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{keyword} Waitfor Delay '0:0:5' -

: If the server takes 5 seconds to respond, the condition is true . {KEYWORD} WAITFOR DELAY '0:0:5'