[Threat Intelligence] Relevant Models

3-Triple model
Cyber Kill Chain model
Diamond model
F3EAD cycle model

[Threat Intelligence] Passive Vulnerability Detectors

shodan (https://www.shodan.io/)
zoomeye (https://www.zoomeye.org/)
censys (https://censys.io/)
securityrating (https://www.securityrating.io/)
FOFA (https://fofa.so/)