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CyberIncident BriefSeverity 8.0/10

Fileless Ransomware & Browser-Based Exploit Campaigns Targeting US Enterprise Environments

WatchkeeperPublished Jun 25, 2026

Symantec has flagged a fileless ransomware backdoor ('Mistic') that evades traditional file-based scans by erasing itself post-execution, while a separate malicious Edge extension capable of sandbox escape and ransomware installation is circulating —

Symantec has flagged a fileless ransomware backdoor ('Mistic') that evades traditional file-based scans by erasing itself post-execution, while a separate malicious Edge extension capable of sandbox escape and ransomware installation is circulating — both posing direct risk to endpoint-heavy environments. With ~48 million contact center, back-office, and knowledge-worker seats across US BPO hubs, any ransomware propagation could disrupt staffing systems, CRM platforms, and WFM tooling at scale. Operations leaders should verify endpoint detection tools are updated for memory-resident and browser-based threat vectors, and confirm BCP/DR runbooks account for potential WFM platform unavailability.

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