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DNThirTeen is a criminal handle or group name observed in phishing-kit artifacts associated with a late-2024 campaign impersonating Swiss railway services and collecting SMS-based two-factor authentication codes. The name appeared alongside the handle SH33NZ0 in kit content. Available evidence does not support attributing DNThirTeen to the separate large-scale malicious Chrome extension operation that trojanized browser extensions for advertising and search-engine-optimization fraud, degraded browser security by stripping Content Security Policy protections, and enabled remote content injection. DNThirTeen is therefore best characterized as a poorly understood cybercriminal identity seen in phishing-related infrastructure, with currently limited high-confidence reporting on its broader operations, victimology, tooling, or organizational structure.
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