On Friday 2 August 2024 at 05:45 UTC, a GRE flood targeted a retail banking customer in the UK. The attack peaked at 155.6 Gbps and lasted 98 minutes. Traffic originated from 1818 autonomous systems in 55 countries, predominantly hijacked home routers.
| Vector | GRE flood |
| Peak | 155.6 Gbps |
| Duration | 98 min |
| Time to mitigation | 0.541 s |
| Attack traffic reaching origin | 0.062% |
| Legitimate traffic challenged | 0.77% |
Timeline
The attack was preceded by a publicly announced sales event. Edge packet filters identified the flood by source port and payload signature and dropped it at line rate across 33 points of presence.
What the customer saw
The customer’s status page stayed green throughout; they learned about the attack from our notification.
Recommendations
- Add a dedicated rate limit for the targeted route.
- Enable log streaming to your SIEM for faster correlation.
- Enable authenticated origin pulls.