Mimecast breach investigators probe possible SolarWinds connection
Mimecast, a global email security provider, on Tuesday said that one of its software security certificates had been breached by a “sophisticated threat actor” in a targeted operation to access customer emails. London-based Mimecast has a sprawling footprint, claiming some 39,000 customers around the world. The company said 10% of its customers use the particular software implementation involved in the breach, adding that attackers apparently targeted “a low single-digit number” of customers. The illicit access would have allowed attackers to spy on Mimecast clients. The hackers’ methods, and the fact that they targeted Microsoft’s cloud-based email services, have parallels with a suspected Russian hacking campaign that has used tainted software made by contractor SolarWinds to breach multiple U.S. government agencies. A person familiar with the matter told CyberScoop that investigators are examining whether the same attackers who breached SolarWinds also infiltrated Mimecast, a detail first reported by Reuters. “As a […]
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