Akira Ransomware Attack Exploits Disabled VPN Account

A recent Akira ransomware attack targeted a mid-sized organization by exploiting a disabled local SSL VPN account through brute-force methods. The attackers gained initial access, performed credential discovery, and executed lateral movement using RDP. Key actions included clearing logs and deleting shadow copies before encryption occurred. The entire intrusion was reconstructed using only firewall syslog and Windows event logs, without endpoint detection tools. Event IDs such as 4624, 4688, and 4769 were crucial in mapping the kill chain. Recommendations include enforcing MFA, removing disabled accounts from access lists, and enhancing log retention policies. The incident highlights the importance of combining perimeter and endpoint telemetry for early detection of ransomware activities.

Key Points: • Attackers exploited a disabled SSL VPN account via brute-force methods. • The intrusion was reconstructed using firewall and Windows event logs without EDR. • Recommendations include enforcing MFA and improving remote access security.