Sophos reveals years-long battle with China-linked threat actors using custom implants to track their activities.Sophos publishes a series of reports named 'Pacific Rim' detailing Chinese hackers' operations targeting network devices worldwide for over 5 years.China-linked threat actors targeted multiple vendors, exploited vulnerabilities in networking devices, and used zero-day vulnerabilities.Sophos observed evolving tactics including targeting critical infrastructure, using stealth techniques, and improving operational security.