What Is Data Exfiltration?

Key Takeaways

• Data exfiltration prevention rates dropped from 9% to just 3%, meaning 97 out of 100 exfiltration attempts go unblocked.
• Attackers follow a four-step process: gaining initial access, moving laterally across the network, staging and compressing data, and transferring it out using protocols like DNS and HTTPS or cloud services like Google Drive and Dropbox.
• Data exfiltration, data leakage, and data breach are distinct. Exfiltration is deliberate and attacker-driven. Leakage is accidental. A breach is any unauthorized access to protected data.
• 45% of data breaches are caused by insider threats, making internal monitoring as critical as perimeter defense.
• The average cost of a ransomware or extortion attack is $5.08 million per incident. Healthcare breaches average $7.42 million per incident.
• Picus Security Control Validation uses Breach and Attack Simulation (BAS) to continuously test your defenses against real exfiltration techniques and identify gaps in your security stack.

Data exfiltration is perhaps the most damaging and hardest-to-detect segment of a cyber attack. According to Picus Security's Blue Report 2025, data exfiltration prevention rates collapsed from 9% to just 3%. That means 97 out of every 100 exfiltration attempts go unblocked.

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