-4640 Union All Select Null,null,null,null,'qbqvq'||'lbznmmwdachxaypteqetdoupxsqdsedwqcwkldne'||'qqbqq',null,null,null,null-- Exgp -

If this string was found in your server logs or application inputs, it indicates that an was performed against your system. It is a signature of a tool checking if it can "reflect" data back to itself through your database.

Are you seeing this in your or during a security audit ? If this string was found in your server

Ensure your application uses parameterized queries or prepared statements to prevent these characters from being executed as commands. You should also check your logs for any successful responses containing the string LBzNMMwdaChxayPTeQETdoUpXSqDSedwqCWKLDNE , which would indicate a successful breach. If this string was found in your server

: The payload concatenates (using || ) three strings. Canary Strings : qbqvq and qqbqq are "canaries" or markers. If this string was found in your server