EX-Action: Automatically Extracting Threat Actions from Cyber Threat Intelligence Report Based on Multimodal Learning

Table 2

The description of five type features.

Type	Feature	Description
Similarity		The similarity between the action and description sentences.
Probability		The probability and frequency of the VO pair.
Mutual information		The MI contains two values, which, respectively, are the VO pair-MI and the SVO triples-MI .
Semantic dependence		The semantic dependency of each word in action.
Distance		It contains two values, which, respectively, express the distance between the verb and the subject and the distance between the verb and the object .