Ransomware is an attack method; a data breach is unauthorized access to or disclosure of protected information. A ransomware attack can also cause a data breach if attackers access or copy information, but encryption by itself does not prove that data was stolen. A breach can happen without ransomware.
Ransomware and data breaches describe different things
| Question | Ransomware | Data breach |
|---|---|---|
| What does the term describe? | An attack in which malware encrypts an organization’s data and attackers demand payment to restore access, as defined in NIST IR 8374 Rev. 1 (June 2026). | An incident involving unauthorized access to or disclosure of protected information. NIST SP 1800-29 (February 23, 2024) addresses detecting, responding to, and recovering from data-confidentiality attacks. |
| What is primarily at risk? | Availability, because files or dependent systems may become unusable; integrity can also be at risk if data is altered or destroyed. | Confidentiality: whether information was viewed, acquired, or disclosed without authorization. |
| Is the other event automatic? | No. Encryption does not establish that information was copied or exposed. | No. A breach does not require encryption or a ransom demand. |
| What might attackers demand? | Payment for a decryption key or restored access; attackers may also threaten to disclose stolen information. | A breach does not necessarily involve extortion or a demand for payment. |
When one incident is both
Some ransomware actors steal information before or alongside encrypting systems, then threaten to publish it unless they are paid. CISA calls the combination of encryption and data exfiltration “double extortion.” CISA also describes extortion based on stolen data and disclosure threats without encryption, so a ransom demand does not by itself establish that the incident involved ransomware.
For example, if attackers encrypt a company’s files but investigators find no evidence that protected information was accessed or transferred, the incident is ransomware but a breach has not been established. If the attackers also copy customer records and threaten to release them, the incident involves both ransomware and a potential data breach. A confirmed breach depends on the evidence and the applicable definitions, not solely on the attackers’ claims.
How to assess what happened
Organizations should follow their approved incident-response plan and assess operational disruption and possible information exposure as separate questions. Useful lines of inquiry include:
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- Encryption and system impact: Which files or systems are encrypted, unavailable, altered, or otherwise affected? Can users still access the systems, and can the integrity of remaining data be trusted?
- Evidence of access or transfer: Is there evidence that protected information was viewed, acquired, or disclosed? CISA identifies unusual outbound data volume and tools or services used to transfer data as potential signs to assess.
- Extortion claim: Is the demand for decryption, for keeping allegedly stolen information private, or for both? Treat an attacker’s assertion of theft as a claim to investigate, not proof.
- Notification duties: What do the incident plan, contracts, and laws applicable to the organization and affected people require? Requirements depend on the facts and jurisdiction; there is no single deadline established here.
What organizations should do during an incident
CISA’s #StopRansomware Guide recommends using an incident-response plan to coordinate containment, investigation, communications, and recovery. The details should be handled by the organization’s response team and appropriate specialists.
- Identify affected systems and isolate them. Determine the scope of disruption and contain affected systems in line with the incident plan.
- Assess possible data exfiltration. Investigate whether information was accessed or transferred; do not infer theft from encryption or a ransom note alone.
- Coordinate and preserve evidence. Bring together relevant internal and external response stakeholders and preserve evidence needed to understand the incident.
- Restore from prepared backups. CISA recommends offline, encrypted backups and restoration from those backups. Recovery planning should account for secure access to backups and verification of restored data.
- Address reporting and notification. Follow the incident plan and obtain appropriate legal advice when a breach is suspected or confirmed. In the United States, CISA identifies CISA, a local FBI field office, the FBI Internet Crime Complaint Center, and other federal contacts as possible reporting or assistance routes; these are not universal requirements for other jurisdictions.
How to prepare for both risks
CISA recommends maintaining and exercising an incident-response plan and a communications plan that cover ransomware, data extortion, and breach response, including notification procedures. NIST IR 8374 Rev. 1 frames ransomware risk management through the Cybersecurity Framework 2.0 functions: governing, identifying, protecting, detecting, responding, and recovering.
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Offline, encrypted backups can support recovery, but they are one part of preparation rather than a guarantee against an attack. Organizations also need a plan for protecting backup access and restoring operations, and should exercise their response and communications procedures.
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