This scripts looks for possible malicious attempts to hack your SQL Server instance. This is done by reading the current error log and searching for multiple failed login attempts from the same IP address. Please note that this requires that “Login auditing for failed logins” is enabled in the properties of your SQL Server instance.
To run this script, simply copy and paste the script into a connected query tab in Microsoft SQL Management Studio and then execute it. It will output a summary list of all failed attempts to guess passwords within the last 24 hours on your SQL Server instance.