Unauthorised Access

Establish and maintain the capability to detect and respond to unauthorised access incidents. Ensure access control policies, monitoring tools, and authentication infrastructure are properly configured and maintained.

Identify and confirm unauthorised access through IDS/IPS alerts, SIEM correlation, authentication log analysis, and user reports. Determine whether the access attempt was successful and assess initial scope.

Perform deep analysis of the unauthorised access incident to determine the attack vector, extent of compromise, data accessed or exfiltrated, and attacker techniques used. Build a comprehensive understanding of the intrusion.

Limit the scope and impact of the unauthorised access by locking compromised accounts, terminating active sessions, blocking attacker IP addresses, and isolating affected systems while preserving evidence.

Remove all attacker access by resetting credentials, removing persistence mechanisms, closing the initial access vector, and hardening authentication controls to prevent re-entry.

Safely restore normal access for legitimate users, re-enable accounts with strengthened controls, validate that unauthorised access has been fully eliminated, and establish enhanced monitoring during the recovery period.

Conduct a thorough post-incident review, document lessons learned, update security controls and detection capabilities, and implement long-term improvements to prevent similar unauthorised access incidents.