What is Ransomware?

Ransomware represents one of the most damaging cyber threats facing organizations today. This malicious software encrypts a victim’s files and demands payment—typically in cryptocurrency—for the decryption key. Unlike other forms of malware that steal data quietly, ransomware makes its presence known immediately, often displaying threatening messages and countdown timers to create urgency.

The impact extends far beyond individual files. When ransomware strikes, it can paralyze entire business operations, forcing companies to shut down systems, halt production, and scramble to restore critical data. Recent analysis shows that companies with an F rating are 13.8x more likely to suffer a data breach versus those with an A rating.

What makes ransomware particularly insidious is its dual nature. Modern ransomware operations don’t just encrypt files—they also steal sensitive data before encryption, threatening to publish confidential information if ransom demands aren’t met. This “double extortion” tactic has become increasingly common, affecting everything from healthcare systems to municipal governments.

How does ransomware work?

Ransomware operations follow a sophisticated, multi-stage process combining social engineering, technical exploitation, and psychological pressure. Understanding this process helps organizations identify attacks before maximum damage occurs.

Initial infection typically begins through phishing emails with malicious attachments or links that mimic trusted sources. Once clicked, the ransomware establishes a foothold through registry entries and begins reconnaissance, mapping network resources and identifying valuable encryption targets.

Before encryption starts, ransomware disables security software and deletes backup files, targeting volume shadow copies and system restore points. This preparatory phase often goes unnoticed for hours or days.

Modern variants like Quantum—analyzed by SecurityScorecard researchers—use sophisticated encryption algorithms. Quantum employs ChaCha20 with RSA-2048 encryption, giving each file a unique key that’s encrypted using a global key, creating multiple protection layers that make unauthorized decryption virtually impossible.

During encryption, malware carefully avoids system files needed for computer function, ensuring victims can see ransom messages. Files in Windows, System Volume Information, and Program Files remain untouched for system stability.

Network infiltration represents the final critical phase. Advanced ransomware scans for shared resources, mapped drives, and vulnerable network systems, using legitimate tools like PowerShell or WMI for lateral movement while seeking domain controllers and backup servers to maximize impact.

Types of ransomware

Ransomware families have evolved significantly since the first variants appeared in the late 1980s. Today’s threat landscape includes several distinct categories, each with unique characteristics and capabilities.

Crypto-ransomware represents the most common type, encrypting files and demanding payment for decryption keys. Examples include notorious families like WannaCry, Ryuk, and the Quantum variant detailed in SecurityScorecard’s research. These variants often target specific file types—documents, images, databases—while keeping system files intact to properly display the ransom message.

Double extortion ransomware has changed the threat landscape by combining file encryption with data theft. Groups like Maze pioneered this approach, adding reputational damage to the threat equation by threatening to publish sensitive information if victims don’t pay.

Ransomware-as-a-Service (RaaS) represents an evolution in cybercriminal business models. Criminal organizations develop ransomware tools and rent them to affiliates, who conduct the actual attacks in exchange for a percentage of ransom payments. This model has democratized access to sophisticated ransomware capabilities.

5 stages of ransomware attack

Ransomware attacks unfold through five stages, each presenting opportunities for detection and prevention. Understanding these stages helps security teams implement appropriate defenses and response procedures.

Stage 1: Initial access and reconnaissance

The attack begins when threat actors gain initial access to the target environment. This might occur through phishing emails, exploitation of unpatched vulnerabilities, compromised credentials, or insider threats. SecurityScorecard’s analysis of real-world attacks shows that 85% of dating apps—representing a broader trend in application security—have experienced breaches in their third-party ecosystems, highlighting how supply chain compromises can provide initial access.

Once inside, attackers conduct reconnaissance to understand the network topology, identify valuable assets, and locate security controls. They may use legitimate system administration tools to avoid detection and gather information about domain controllers, backup systems, and high-value data repositories.

Stage 2: Privilege escalation and persistence

Attackers work to obtain higher-level privileges and establish persistent access to the environment. They might exploit local vulnerabilities, steal credentials from memory, or use social engineering against IT administrators. The Quantum ransomware analysis reveals sophisticated techniques for enabling debug and restore privileges, allowing the malware to access usually protected system resources.

Persistence mechanisms ensure the attackers maintain access even if initial infection vectors are discovered and closed. These include creating new user accounts, modifying system services, or installing backdoors in legitimate software.

Stage 3: Defense evasion and lateral movement

With elevated privileges established, attackers move laterally through the network while avoiding detection. They disable security software, clear event logs, and use living-off-the-land techniques that leverage existing system tools. The analysis shows how advanced ransomware can stop targeted services and processes that might interfere with encryption.

Lateral movement techniques include password spraying, exploitation of trust relationships, and abuse of administrative tools. Attackers often target domain controllers to gain access to credential databases that allow movement throughout the entire network.

Stage 4: Data exfiltration and preparation

Before deploying ransomware, many attackers now steal sensitive data to support double extortion tactics. They identify and extract intellectual property, financial records, customer data, and other information that could damage the organization if published. This stage can last weeks or months as attackers carefully select and transfer valuable data.

Simultaneously, attackers prepare for the ransomware deployment by identifying critical systems, mapping network shares, and positioning ransomware payloads throughout the environment for maximum impact.

Stage 5: Ransomware deployment and monetization

The final stage involves simultaneous deployment of ransomware across multiple systems, typically during off-hours or weekends when IT staff availability is limited. Advanced variants like Quantum can encrypt both local drives and network shares while avoiding critical system files needed to display the ransom message.

The ransom note provides instructions for payment and data recovery, often including threats about data publication and payment deadlines. Threat actors may engage in negotiations with victims, sometimes providing proof of decryption capability or offering reduced payments for a quick response.

Ransomware prevention strategies

Effective ransomware prevention requires a comprehensive approach that addresses multiple attack vectors and organizational vulnerabilities. The most successful strategies combine technical controls with employee education and incident response planning.

Network segmentation and access controls

Proper network segmentation limits ransomware spread by restricting lateral movement opportunities. Organizations should implement zero-trust principles, requiring authentication and authorization for every network connection. Critical systems like domain controllers, backup servers, and databases should reside in isolated network segments with strict access controls.

SecurityScorecard’s research demonstrates the importance of continuous monitoring for network vulnerabilities. Organizations with strong security ratings—measured through factors like network security, DNS health, and patching cadence—show significantly lower breach rates compared to those with poor security postures.

Regular backup and recovery testing

Comprehensive backup strategies form the foundation of ransomware resilience. Organizations need multiple backup copies stored in different locations, including offline or immutable storage that ransomware cannot access. The 3-2-1 backup rule (three copies of data, two different media types, one offsite) provides a starting framework.

However, having backups isn’t enough—organizations must regularly test restoration procedures to ensure backups work when needed. Many organizations discover backup failures only during actual emergencies, when quick recovery becomes impossible.

Patch management and vulnerability assessment

Consistent patching eliminates many attack vectors that ransomware exploits. Organizations should maintain current inventories of all systems and applications, prioritizing patches for internet-facing systems and critical infrastructure. Automated patch management tools can help maintain consistency across large environments.

Regular vulnerability assessments identify systems that need attention before attackers can exploit them. Third-party security ratings services can provide external perspectives on organizational security posture, helping identify risks that internal teams might miss.

Email security and user training

Since phishing remains a primary ransomware vector, robust email security controls are fundamental. These include advanced threat protection solutions that analyze attachments and links in real time and policies that restrict executable file types in emails.

User training should focus on practical skills rather than theoretical knowledge. Employees need to recognize sophisticated phishing attempts, understand safe browsing practices, and know how to report suspicious activities. Regular simulated phishing exercises help maintain awareness without causing disruption.

How to defend against ransomware

Defending against ransomware requires layered security controls that provide multiple opportunities to detect and stop attacks. No single solution can guarantee protection, but combining multiple approaches significantly reduces risk.

Endpoint detection and response (EDR)

Modern endpoint security solutions use behavioral analysis to identify ransomware activities even when the malware uses previously unknown techniques. These systems monitor file system changes, process behaviors, and network communications to detect encryption activities or suspicious process execution.

EDR solutions should integrate with broader security operations centers (SOCs) to enable rapid response when threats are detected. Automated response capabilities can isolate infected systems and prevent lateral movement while human analysts investigate the incident.

Application whitelisting and execution control

Application whitelisting prevents unauthorized software execution by maintaining approved application lists. This approach stops ransomware from running even if it reaches endpoint systems. Implementation requires careful planning to avoid disrupting legitimate business activities, but the security benefits often justify the operational overhead.

Script control policies can prevent PowerShell, Windows Script Host, and other administrative tools from running with user privileges, eliminating common ransomware execution methods.

Network monitoring and anomaly detection

Continuous network monitoring helps detect lateral movement and data exfiltration activities that precede ransomware deployment. Security teams should establish baselines for normal network traffic patterns and implement alerting for unusual activities like large file transfers, off-hours access, or connections to suspicious external hosts.

Network access control (NAC) solutions can automatically isolate systems that exhibit suspicious behaviors, preventing the spread of ransomware while investigations continue.

Steps to mitigate ransomware attacks for your business

Every organization needs specific, actionable steps to reduce ransomware risk. These measures should align with business operations while providing meaningful security improvements.

Conduct regular security assessments

Organizations should perform comprehensive security assessments that evaluate technical controls, policies, and procedures. Third-party assessments provide objective perspectives on security posture and help identify blind spots internal teams might miss. Organizations can refer to proven methodologies for preventing ransomware attacks for detailed guidance on implementing comprehensive protection strategies.

Security ratings services can continuously monitor external-facing assets, alerting organizations to newly discovered vulnerabilities or misconfigurations that could enable attacks.

Implement incident response plans

Effective incident response plans outline specific steps for ransomware incidents, including communication procedures, technical response actions, and decision-making authority. Plans should address both encryption-only attacks and double extortion scenarios involving sensitive data theft.

Regular tabletop exercises help teams practice response procedures and identify gaps in planning or capabilities. To ensure a coordinated response, these exercises should include IT, legal, communications, and executive leadership representatives.

Establish vendor risk management

Since supply chain attacks represent significant ransomware vectors, organizations need robust vendor risk management programs. This includes security assessments of third-party vendors, contract requirements for security controls, and ongoing monitoring of vendor security posture.

Supply chain compromises represent a significant vector for ransomware attacks. Organizations looking to strengthen their overall security posture should consider implementing comprehensive steps to mitigate ransomware attacks.

Deploy multi-factor authentication

Multi-factor authentication (MFA) significantly reduces the risk of credential-based attacks, which often precede ransomware deployment. Organizations should implement MFA for all administrative accounts, remote access systems, and cloud services.

However, MFA implementation should consider usability to ensure widespread adoption. Modern solutions include biometric authentication, hardware tokens, and push-based mobile authentication, balancing security with user convenience.