Web Application Firewall Using Machine Learning and Features Engineering

Table 3

Subfeatures of attack weight feature.

Subfeature	Description
URL weight	Sum of weights of discovered manipulation in URL
Number of attack words in inputs	Sum of weights of discovered attack words in inputs
Manipulate payload weight	Sum of weights of discovered manipulation in payloads
Alphanumeric character to special character ratio	The ratio of the number of alphanumeric characters to the number of nonalphanumeric characters
Files weight	Sum of weights of the malicious files (malicious file weight is the weight of extension + sum of weights of scan using three antiviruses)