Hypotheses, telemetry, and human judgment: Inside Cisco Talos Threat Hunting
Summary: Cisco Talos Threat Hunting starts with a hypothesis about how a specific adversary's techniques would appear in telemetry, then searches for it, rather than waiting for a known-bad pattern to cross an alerting threshold. In one customer engagement, analysts combined firewall data showing outbound ConnectionEvents to 144.31.221.82 on port 6060 with URL path /capcha9856 and endpoint process history to confirm KongTuke C2 activity, including obfuscated PowerShell execution and anti-forensics file cleanup.
Why it matters: Talos says its hunts run continuously across telemetry from nearly 50 million sensors, and that a single confirmed finding was used to search the full customer environment for other hosts showing the same behavior - turning one detection into a map of how far the intrusion had spread.
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