Attachment sandbox false negatives communication
Overview
When sandbox misses malware, clients blame MSP stack—be factual about limits.
Explain
Deterministic evasion, password zips with delayed payloads, novel families before signatures.
Actions
Submit samples vendor-to-vendor; tighten policy temporarily; retrospective hunt.
Comms
“We’re enhancing layers X and Y; no vendor catches 100%—defense in depth matters.”
Contracts
Avoid unlimited liability language in MSA appendices.
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