The IIS log events indicate a SQL Injection Attack. This is evident from the complex SQL queries present in the log, which include functions like “UNICODE”, “SUBSTRING”, and “MAX”. These functions are being used in a manner that suggests manipulation of strings and extraction of data, which are common tactics in SQL injection attacks. The use of specific characters like CHAR(97) and CHAR(108) within the queries is a technique often employed to bypass security mechanisms during such attacks.

References: For further study and verification, the EC-Council’s Certified SOC Analyst (CSA) course materials and study guides provide extensive information on identifying and responding to various types of cyber attacks, including SQL Injection. These resources are essential for any security analyst to understand the intricacies of log analysis and attack identification.