Mandiant's 2026 guide on defending against destructive cyberattacks covers organizational resilience, technical hardening, and detection strategies. Key areas include: establishing out-of-band communication and recovery plans, enforcing MFA with phishing-resistant methods (FIDO2 preferred), hardening external-facing assets, protecting Active Directory and domain controller backups, segmenting IT and OT environments, restricting egress traffic, securing virtualization infrastructure (VMware vSphere and Hyper-V) with zero-trust network architecture, protecting against offline credential theft via disk swap attacks, implementing immutable and encrypted backups, hardening Windows endpoints against lateral movement (SMB, RDP, NTLM, WMI), and leveraging Google SecOps detection rules for destructive attack indicators.
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