What is Data Exfiltration?

Data exfiltration is typically the final objective — or a key phase — of a cyberattack. Attackers who have gained access to internal systems search for high-value data: customer records, intellectual property, credentials, financial data, and trade secrets. The exfiltration itself can happen through many channels: encrypted tunnels to external servers, DNS or HTTPS covert channels, email forwarding rules, cloud storage uploads, or even physical USB drives.

Modern data exfiltration is often slow and deliberate. Attackers stage data in compressed or encrypted archives, exfiltrate in small increments to avoid detection, and use legitimate services (cloud storage, collaboration tools) as transfer mechanisms. The growing adoption of double-extortion ransomware has made exfiltration a standard precursor to encryption attacks, with stolen data used as additional leverage for ransom demands.

Prevention requires a defense-in-depth strategy: network monitoring and anomaly detection, data loss prevention (DLP) tools, endpoint controls, strict access policies, and encryption of sensitive data at rest. Equally important is minimizing the amount of sensitive data that exists in extractable form. Credentials, API keys, and secrets stored in plaintext across emails, wikis, and shared drives represent easily harvested targets during exfiltration.

How Vaulted uses Data Exfiltration

Vaulted directly reduces the volume of sensitive data available for exfiltration. Secrets shared through Vaulted are encrypted client-side with AES-256-GCM before reaching the server, and the server never holds decryption keys (zero-knowledge). Links self-destruct after a limited number of views, so even if an attacker exfiltrates the server's Redis store, they obtain only encrypted blobs with automatic TTL-based expiry. Compared to secrets sitting in plaintext in email archives or Slack history, Vaulted leaves no persistent sensitive data for attackers to extract.