{keyword} Union All Select Null,null,null,null,null,null,null,null,null,null# Apr 2026

"{KEYWORD} UNION ALL SELECT NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL#"

: The attacker is guessing the number of columns in the original table. If they get the number right, the database will return a successful (though empty) result. If they get it wrong, it will throw an error. The string you provided is a classic example

The string you provided is a classic example of a SQL injection payload, a technique used by hackers to manipulate database queries. This specific payload uses the UNION ALL SELECT statement to attempt to append a row of null values to the results of an existing query, often used to determine the number of columns in a database table. Instead, he crafted a response

He didn't just block the IP address; that was too easy. Instead, he crafted a response. He set up a "honeypot"—a fake table filled with realistic but useless data. He then modified the application's code to redirect any query containing a UNION statement to this decoy. Elias leaned back

The malicious string remained in the logs, a silent testament to a battle fought in the shadows of the company's infrastructure. Elias took a sip of his coffee, the bitter taste a perfect accompaniment to the satisfaction of a job well done. The ghost in the database had been exorcised.

Elias leaned back, his eyes narrowing. The attacker was patient. They had tried five nulls, then six, then seven. Now they were at ten. They were mapping the architecture of his database, one column at a time.

He pulled up the logs and saw it—a string of text that didn't belong.