This is a final "always true" statement used to ensure the rest of the original, legitimate SQL query doesn't break the injection. What is the Goal?
CHR(100)||CHR(85)||CHR(102)||CHR(83) translates to the string "dUfS" .The code asks the database: "Does dUfS equal dUfS?" Since this is always true, the database will process the request without an error. This is a final "always true" statement used
The 'KEYWORD' starts by closing a legitimate search or input field with a single quote. This allows the attacker to append their own logic. The 'KEYWORD' starts by closing a legitimate search
If it works, the attacker will replace the "True" statement with a query that asks for sensitive data, such as: "Is the first letter of the admin password 'A'?" For the database to return a result, the
The payload uses AND statements. For the database to return a result, the conditions following the AND must be true.
If you are a developer, seeing this in your logs means someone is scanning your site for holes. You can stop these attacks by using (Prepared Statements). This ensures the database treats input as "just text" rather than executable code, rendering the single quotes and CHR commands harmless.