This whitepaper from RSI Security traces ransomware’s evolution from 1989 to today's crypto-driven attacks. It details foundational defense layers: antivirus, patching, access controls, perimeter firewalls, DNS sinkholes, segmentation, and spam/web filters. It also emphasizes least-privilege policies on NAS servers, immutable backups, and recovery testing. Legal and regulatory guidance highlights risks tied to ransom payments and crypto. The paper urges a proactive strategy with layered defenses, compliance with standards like CCSS, and planning for business continuity to mitigate downtime, data loss, and reputational harm.

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