If you are seeing this in your logs, it means an automated scanner or attacker is probing your site for weaknesses. You can defend against this by:
CHAR(121)||CHAR(107)||CHAR(70)||CHAR(106) translates to .
Are you seeing these queries in your or a specific application's search field ? If you are seeing this in your logs,
: Ensure your application uses Prepared Statements to separate user input from the SQL command.
The query asks the database: "If the first characters of a system user name equal 'ykFj', is that equal to 'gpWr'?" Since these strings do not match, the query is likely being used as a test. An attacker monitors whether the application's response changes (e.g., a different error message or a successful page load) based on whether the injected condition evaluates to true or false. How to Protect Your Site : Ensure your application uses Prepared Statements to
: These functions convert ASCII numeric codes into text characters.
: Use a WAF to automatically block requests containing known SQL injection patterns. How to Protect Your Site : These functions
CHAR(103)||CHAR(112)||CHAR(87)||CHAR(114) translates to .