https://www.dhs.gov/sites/default/files/publications/privacy-pia-nppd-einstein3a-may2016.pdf
Web Content Filtering (WCF) provides protection at the application layer for web traffic by blocking access to suspicious websites, preventing malware from running on systems and networks, and detecting and blocking phishing attempts as well as malicious web content.
https://www.trustradius.com/web-content-filtering
This site provides a listing of Web Content Filtering solutions. WCF solutions comprise appliances and software for censoring or preventing access to restricted web content deemed offensive or inappropriate.
US-CERT – Targeted Cyber Intrusion Detection and Mitigation Strategies
csc7.7 csc8.7
https://www.cisa.gov/news-events/news/targeted-cyber-intrusion-detection-and-mitigation-strategies-update-b
This guidance from CISA applies to organizations whose networks have been compromised by a cyber attack as well as to those desiring to improve their network security preparedness to respond to a cyber incident.