{keyword} Union - All Select Null,null,null,null-- Uizf

: This is likely a random string used as a unique identifier or "signature" to help the attacker find their specific test result in a large log file or report. Purpose of Such a Payload Attackers use this technique to:

: This represents the original search term or input field. The attacker appends the malicious code to this keyword. {KEYWORD} UNION ALL SELECT NULL,NULL,NULL,NULL-- Uizf

: This is a SQL comment symbol. It tells the database to ignore the rest of the original, legitimate query, effectively "breaking" the intended logic to execute the injected code. : This is likely a random string used

This string is a classic example of a , specifically a Union-Based SQLi attack . It is used by attackers to test for vulnerabilities or extract data from a database. Breakdown of the Payload : This is a SQL comment symbol

: This command tells the database to combine the results of the original query with a new "injected" query.