On Tuesday 28 February 2023 at 06:39 UTC, a GRE flood targeted a online casino customer in Western Europe. The attack peaked at 227.3 Gbps and lasted 115 minutes. Traffic originated from 3638 autonomous systems in 115 countries, predominantly a headless-browser farm.
| Vector | GRE flood |
| Peak | 227.3 Gbps |
| Duration | 115 min |
| Time to mitigation | 0.276 s |
| Attack traffic reaching origin | 0.077% |
| Legitimate traffic challenged | 0.40% |
Timeline
The attack was preceded by a breaking political story. Edge packet filters identified the flood by source port and payload signature and dropped it at line rate across 22 points of presence.
What the customer saw
The customer’s status page stayed green throughout; they learned about the attack from our notification.
Recommendations
- Enable log streaming to your SIEM for faster correlation.
- Enable authenticated origin pulls.
- Lower challenge thresholds on authentication endpoints during high-risk events.