On Tuesday 27 February 2024 at 14:31 UTC, a GRE flood targeted a retail banking customer in Western Europe. The attack peaked at 316.9 Gbps and lasted 100 minutes. Traffic originated from 2048 autonomous systems in 92 countries, predominantly a rented booter service.
| Vector | GRE flood |
| Peak | 316.9 Gbps |
| Duration | 100 min |
| Time to mitigation | 0.340 s |
| Attack traffic reaching origin | 0.049% |
| Legitimate traffic challenged | 0.06% |
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
No customer-visible impact. The on-call engineer was notified and acknowledged the incident from the dashboard.
Recommendations
- Enable log streaming to your SIEM for faster correlation.
- Review allow-listed partner ranges quarterly.
- Add a dedicated rate limit for the targeted route.