On Thursday 12 October 2023 at 10:59 UTC, a UDP reflection (DNS) targeted a crypto exchange customer in Western Europe. The attack peaked at 65.2 Gbps and lasted 134 minutes. Traffic originated from 2691 autonomous systems in 39 countries, predominantly a rented booter service.
| Vector | UDP reflection (DNS) |
| Peak | 65.2 Gbps |
| Duration | 134 min |
| Time to mitigation | 0.081 s |
| Attack traffic reaching origin | 0.008% |
| Legitimate traffic challenged | 0.13% |
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 13 points of presence.
What the customer saw
Checkout conversion was unchanged compared with the same hour of the previous week.
Recommendations
- Keep origin IPs out of public DNS history.
- Enable log streaming to your SIEM for faster correlation.
- Review allow-listed partner ranges quarterly.