threat hunting (noun)
The process of proactively searching through networks to detect and isolate security threats, rather than relying on security solutions or services to detect those threats.
CyberWire Glossary link
Audio reference link: “My ‘Aha!" Moment - Methods, Tips, & Lessons Learned in Threat Hunting - sans Thir Summit 2019.” YouTube, YouTube, 25 Feb. 2020.