“Unseen Exfil: Silent Ways Data Walks Out the Door”

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Cloud Sync Tools Are Used as Covert Channels

Dropbox, Google Drive, and OneDrive run as trusted processes. Attackers use them to sync stolen files automatically. EDR rarely flags legitimate sync activity as suspicious.

Steganography Hides Data in Images, Audio, and Video

Sensitive data is embedded in multimedia files that look harmless. These files pass through filters, proxies, and DLP systems undetected. Exfiltration happens via memes, not ZIP files.

APIs Leak Data Without Triggering Security Alerts

Many platforms allow bulk export via APIs with no rate limit. Attackers use legitimate endpoints to pull gigabytes of sensitive info. These requests look like normal traffic.

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DNS and ICMP Are Used as Low-Bandwidth Channels

Attackers encode data into DNS queries or ping packets. It leaves the network looking like routine background noise. Security systems rarely inspect this layer deeply.

Print Jobs, Fax, and Scan-to-Email Are Exfil Paths

Multifunction devices are overlooked as threat vectors. Print queues and scan-to-email features send confidential documents externally. Logging is nonexistent and alerts are rare.

Trusted SaaS Tools Provide Export by Default

CRM, HR, and finance platforms often have CSV export options. These require no approval and bypass DLP. Staff can walk out with millions of records in a click.

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