Glossary

Ransomware

Ransomware is malware that denies a victim access to their systems or data — typically by encrypting files — and demands payment, usually in cryptocurrency, to restore access. Modern ransomware also steals data before encrypting, threatening to publish it (double extortion) and to harass customers or partners (triple extortion). Ransomware is the dominant extortion threat and a top cause of major organisational disruption.

Ransomware has evolved from a relatively simple criminal enterprise into an industrialised, services-based economy. Early ransomware was often opportunistic, encrypting individual machines and demanding modest sums. The current model is operated by ransomware-as-a-service groups that maintain the malware and the leak-site infrastructure, recruit affiliates who conduct the intrusions, and split the proceeds. This specialisation has produced professional operations with brands, negotiation teams, customer support for victims who pay, and reputations they work to maintain — all in service of a criminal business that causes enormous damage.

The double and triple extortion models define the current threat. Double extortion adds data theft to encryption: the attacker exfiltrates data before encrypting, then threatens to publish it on a leak site if the ransom is not paid, so that even an organisation with good backups faces a decision. Triple extortion extends the pressure by directly contacting the organisation's customers, partners, or patients, or by launching DDoS attacks to add urgency. Some groups have targeted individuals whose data was stolen. The result is that recovery from backups, while essential, no longer resolves the full incident.

The typical intrusion path is well-understood and largely preventable. Initial access is most often gained through phishing, exposed or vulnerable remote-access services, compromised credentials (frequently from infostealer logs), or unpatched internet-facing software. The attacker then establishes persistence, escalates privileges, moves laterally to reach the systems they intend to encrypt, identifies and compromises backups, exfiltrates data, and finally deploys the ransomware across as many systems as possible in a short window. Each stage offers a defensive opportunity, and organisations that invest in the basics — MFA, patching, EDR, backups, and detection — substantially reduce their risk.

Recovery from a ransomware incident is where the value of preparation becomes apparent. Organisations with tested, offline, immutable backups can rebuild without paying. Those with a practiced incident-response process can contain and recover under control. Those with neither face a binary choice between paying (with no guarantee of recovery, and funding further attacks) or a prolonged, disruptive rebuild. Encryption-key capture — intercepting the keys some ransomware families hold in memory — can in some cases enable automated decryption without paying, which is a capability that dedicated anti-ransomware platforms provide.

Passeca addresses ransomware across prevention, protection, and response. Prevention through assessment, hardening, and awareness; protection through Halcyon anti-ransomware with pre-execution prevention, exfiltration blocking, key capture, and EDR tamper protection; detection and response through SOC-as-a-Service and incident response; and recovery through ransomware negotiation support and the IR team's containment, eradication, and recovery capabilities. A ransomware readiness checklist is available as a free guide to help organisations assess their own preparation before an incident forces the question.

Related Passeca serviceRansomware Protection (Halcyon)
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