On Thursday 20 June 2024 at 22:41 UTC, a GRE flood targeted a healthcare portal customer in Iberia. The attack peaked at 274.4 Gbps and lasted 163 minutes. Traffic originated from 1104 autonomous systems in 104 countries, predominantly hijacked home routers.
| Vector | GRE flood |
| Peak | 274.4 Gbps |
| Duration | 163 min |
| Time to mitigation | 0.301 s |
| Attack traffic reaching origin | 0.006% |
| Legitimate traffic challenged | 0.13% |
Timeline
The attack was preceded by a ransom note demanding payment in Monero. Edge packet filters identified the flood by source port and payload signature and dropped it at line rate across 17 points of presence.
What the customer saw
The customer’s status page stayed green throughout; they learned about the attack from our notification.
Recommendations
- Lower challenge thresholds on authentication endpoints during high-risk events.
- Keep origin IPs out of public DNS history.
- Enable authenticated origin pulls.