Why does ransomware exfiltrate data?

Attackers steal data before encrypting it to gain additional leverage. Even if a victim can restore from backups and avoid paying for decryption, the threat to publish or sell the stolen data — double extortion — pressures them to pay anyway. Some groups add a third layer, such as threatening customers or launching denial-of-service attacks.

Exfiltration usually happens during dwell time, before encryption. Elastio’s persistence detection surfaces the staging and exfiltration indicators that precede the encryption payload, helping identify attacker presence earlier.

Last updated May 27, 2026