01. Ransomware
Files encrypted, ransom note on screen, business at a standstill.
Step-by-step
- 1Isolate affected systems from the network immediately. Pull the network cable or disable Wi-Fi on infected devices. Do NOT power them off โ preserve volatile evidence.
- 2Stop the spread. Disable shared drives, pause backups (you don't want to overwrite clean ones), and reset credentials for admin accounts.
- 3Call the Canadian Centre for Cyber Security (1-833-CYBER-1) for free technical guidance, even before involving law enforcement.
- 4If money was demanded: call the Canadian Anti-Fraud Centre (1-888-495-8501). They coordinate with the RCMP and track ransom payments.
- 5Engage a professional IR firm (we can coordinate) to determine the variant, scope of compromise, and whether decryption is feasible.
- 6Check your backups BEFORE considering payment. If you have clean, immutable, offsite backups โ restore from those.
- 7Assume the attacker had access for weeks. Reset ALL credentials (not just affected ones). Audit MFA, VPN keys, and service accounts.
- 8After containment: PIPEDA breach assessment within 72 hours, cyber insurance claim, post-incident report.
