CyberGlossary

Malware

Doxware

Also known as: Leakware, Extortionware

Definition

Malware that threatens to publish stolen sensitive data unless a ransom is paid, combining extortion with data-leak blackmail.

Doxware, also called leakware or extortionware, is malware focused on data exfiltration rather than just encryption. After compromising a victim, the attacker steals confidential files (emails, customer records, intellectual property, regulated data) and threatens to publish or sell them on a leak site unless paid. It often accompanies modern ransomware as the "double-extortion" stage but can also operate without any encryption. Defences include strict data loss prevention, network segmentation to limit attacker movement, monitoring unusual outbound transfers, encrypting sensitive data at rest, robust identity and MFA controls, and incident-response playbooks that include legal and crisis-communications coordination.

Examples

  • A ransomware affiliate publishing pieces of stolen data on a darknet leak site until the victim pays.
  • Threat actors emailing customers of a breached company to pressure them into paying.

Related terms