O tempo está passando. No momento em que você percebe que seus sistemas estão sob um ataque de ransomware, cada segundo conta. As primeiras 24 horas são fundamentais para determinar a extensão dos danos, minimizar perdas adicionais e preparar o terreno para a Recovery. Este guia oferece um plano de ação conciso para ajudá-lo a lidar com esse período crucial.
Primeiros passos fundamentais
A primeira hora após um ataque de ransomware é extremamente importante. Suas ações imediatas devem incluir o seguinte:
Resposta imediata (primeiras 2 a 4 horas)
- Containment: Prioritize and disconnect infected systems from the network to prevent further spread. This may involve shutting down servers, disabling network segments, and enabling firewall rules to block malicious traffic.
- Isolate: Physically or virtually isolate critical systems and data stores to limit the impact of the attack.
- Identificação e triagem: Faça a triagem dos sistemas críticos, identificando-os e priorizando sua restauração em uma rede limpa. Prepare esses sistemas para análise forense e identifique as contas envolvidas na violação.
Resposta rápida de acompanhamento (4 a 6 horas)
- Activate: Launch your Incident Response plan (IRP) and assemble your core response team (IT, security, legal, and communications).
- Assess: Identify the scope of the attack, including affected systems, the type of ransomware involved, and any ransom demands.
- Secure Backups: Isolate and verify your backups. Confirm they are offline, inaccessible to attackers, and usable for recovery.
- Communicate: Establish internal and external communication channels to keep stakeholders informed.
Ações em andamento (0 a 24 horas ou mais)
- Documentação: Documente meticulosamente todas as ações, observações e comunicações. Esse registro será fundamental para as investigações e a Recovery, incluindo a análise forense pós-incidente. Colete minuciosamente todos os rastros digitais e registros disponíveis.
- Investigate: Conduct a thorough investigation to determine the root cause of the attack and identify any vulnerabilities that need to be addressed.
Containing the Damage and Planning Your Response (6-24+ Hours)
Once you’ve taken those first steps, you can shift your focus to the following actions.
- Engage Cyber Insurance: If you have cyber insurance, notify your provider immediately. They can offer valuable guidance, resources, and financial support.
- Report to Law Enforcement: Contact relevant law enforcement agencies, such as the FBI or your local cybercrime unit, to report the incident.
- Enlist Cybersecurity Experts: If you lack in-house expertise, bring in cybersecurity specialists. They can assist with malware analysis, advanced containment strategies, and recovery planning.
- Communication Strategy: Establish a clear communication plan. Keep employees, customers, and stakeholders informed with transparent and timely updates.
- Recovery Options: Evaluate your recovery options documented in your cyber recovery plan. This may include:
- Restauração a partir de backups (confirme se eles estão acessíveis, sem erros e verificados).
- Consulting with legal counsel about the possibility of negotiating with attackers (proceed with extreme caution).
Recovery and Building Resilience (24-48+ Hours)
O foco das próximas 24 horas passa a ser a recuperação ativa de seus sistemas e a implementação de medidas para melhorar sua postura de segurança:
- Activate your cyber recovery plan. This might involve restoring from backups and rebuilding affected systems. Consider restoring to a cleanroom environment to keep restored systems and data free from any persistent threats. Prioritize critical systems and data to minimize downtime and business disruption.
- Strengthen your security measures. Take steps to helps reduce future attacks by patching vulnerabilities, updating security software, and implementing multi-factor authentication. Review your security policies and procedures to identify any weaknesses that may have contributed to the attack.
- Conduct a thorough post-incident review. Analyze the attack to understand how it happened, identify vulnerabilities in your systems, and improve your incident response plan for future events. This review should involve all key stakeholders and lead to actionable changes.
- Consult with legal counsel. Comply with relevant laws, such as data breach notification laws. Explore potential legal actions against the perpetrators.
- Maintain vigilance. Continue to monitor your systems for any signs of reinfection or suspicious activity. The threat landscape is constantly evolving, so adapt your security measures accordingly.
Ações pós-Recovery (em andamento)
Recovering from a ransomware attack is a significant undertaking, but the work doesn’t end once your systems and data are restored. Post-recovery is an ongoing process that starts within the first 24 hours and continues throughout the recovery journey. Here’s what it entails:
- Immediate Post-Incident Analysis (Within 24 Hours): Begin preliminary analysis immediately to gather initial insights into the attack’s origin, methods used, and immediate vulnerabilities. This early analysis informs urgent security enhancements.
- Ongoing Security Enhancement (Throughout Recovery): Continuously strengthen your security posture based on evolving findings from the ongoing investigation. This may include:
- Fortalecimento dos controles de acesso e das medidas de autenticação.
- Corrigir vulnerabilidades e atualizar softwares.
- Reforçando a segurança da rede com firewalls, sistemas de detecção de invasões e ferramentas avançadas de proteção contra ameaças.
- Implementação de soluções de segurança de e-mail para filtrar anexos e links maliciosos.
- Melhorando a segurança dos terminais com soluções antivírus, antimalware e de detecção e resposta em terminais (EDR).
- Employee Training (Ongoing): Reinforce cybersecurity awareness among employees through continuous training and education. Focus on topics such as phishing scams, social engineering, password security, and safe browsing habits.
- Policy and Protocol Updates (Ongoing): Regularly review and update security policies and protocols based on new information and industry best practices. Confirm they are aligned with regulatory requirements.
- Backup and Recovery Review (Ongoing): Continuously evaluate and improve your backup and recovery strategy. Check that you have frequent, reliable backups that are stored securely and tested regularly. Consider immutable backups that cannot be altered or deleted by attackers.
- Cyber Recovery Plan Refinement (Ongoing): Regularly refine your cyber recovery plan based on your experience and evolving threats. Identify areas for improvement and confirm that your plan is up to date and comprehensive.
- Ongoing Monitoring: Maintain vigilance and continuously monitor your systems and networks for suspicious activity. Leverage security information and event management (SIEM) tools and threat intelligence to proactively identify and respond to potential threats.
By adopting this ongoing approach to post-recovery, you can continuously improve your organization’s security posture and resilience against future attacks.
Pontos principais
Cyber Recovery Plan: A well-defined cyber recovery plan minimizes downtime, helps to enable continuous business, and reduces the risk of reinfection. It creates a framework for increasing your organization’s cyber resilience or ability to restore access to functionality of critical IT systems and data in the event of a cyberattack.
- Incident Response Plan: Outlines the steps to take during an attack, including communication protocols, escalation procedures, and roles and responsibilities.
- Cyber Recovery Plan: Focuses on restoring critical systems and data after an attack.
- Business Continuity Plan: A broader plan that addresses how to maintain essential business operations during any disruption, including ransomware attacks.
Act Decisively: The first few hours are critical. Rapid response and containment can significantly limit the damage and improve your chances of a successful recovery.
Learn and Improve: Every attack is a learning opportunity. Conduct a thorough post-incident analysis to understand what happened, why it happened, and how to prevent it from happening again. Continuously strengthen your security posture and cyber resilience.
Uma palavra final
Navigating a ransomware attack demands decisive action and a commitment to cyber resilience. This starts with developing comprehensive incident response, cyber recovery, and business continuity plans today. Remember that cyber resilience is an ongoing journey. Regularly review and refine your plans, strengthen your security posture, and educate your team. By taking a proactive approach, you can increase your chances of withstanding and recovering from cyber threats. Don’t wait for an attack to happen. Take the first step toward a more secure future.
Quer estar ainda mais preparado?
Ransomware attacks can be devastating, but with the right planning and preparation, you can significantly reduce the impact. To learn more about building a robust cyber resilience plan, consider attending our Cyber Resilience Planning Workshop. This interactive workshop, offered in cities worldwide, guides participants through the process of creating a comprehensive cyber recovery plan. Using real-world scenarios, the workshop helps organizations develop strategies to withstand and recover from cyberattacks.
Inscreva-se hoje mesmo em um workshop and take a proactive step toward protecting your organization.
