{keyword}' Union All Select Null,null,null,null,null,null-- Vigj (Newest SECRETS)

: This is the SQL comment symbol. It tells the database to ignore the rest of the original, legitimate query that follows the injection point, preventing syntax errors.

The string you provided, '{KEYWORD}' UNION ALL SELECT NULL,NULL,NULL,NULL,NULL,NULL-- viGJ , is a classic example of a , specifically a Union-Based SQL Injection attack. : This is the SQL comment symbol

: This is a random string (often called a "cache buster" or signature) used by security researchers or automated scanners to identify their specific request in server logs. The Objective of the Attack '{KEYWORD}' UNION ALL SELECT NULL