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A sophisticated phishing campaign impersonates DocuSign's branding to compromise victims through malicious JavaScript embedded in fraudulent webpages. The attack leverages social engineering to trick users into downloading MSI installers disguised as legitimate DocuSign updates or documents. These payloads establish remote access through legitimate Remote Monitoring and Management tools from Atera Network Ltd and ConnectWise/ScreenConnect. Investigation revealed extensive attacker infrastructure spanning hundreds of domains, with tracking mechanisms via Telegram bots collecting detailed victim telemetry including IP addresses, geolocation, ISP information, and user-agent strings. The campaign targets both Windows and macOS systems, utilizing deployment kits across multiple infrastructures with similar URL patterns and JavaScript mechanisms.
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