On Wednesday 21 December 2022 at 22:25 UTC, a GRE flood targeted a healthcare portal customer in Latin America. The attack peaked at 370.7 Gbps and lasted 79 minutes. Traffic originated from 1973 autonomous systems in 30 countries, predominantly residential proxy networks.
| Vector | GRE flood |
| Peak | 370.7 Gbps |
| Duration | 79 min |
| Time to mitigation | 0.167 s |
| Attack traffic reaching origin | 0.022% |
| Legitimate traffic challenged | 0.11% |
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 36 points of presence.
What the customer saw
A brief increase in p99 latency of 111 ms during the first minute, then normal service.
Recommendations
- Enable log streaming to your SIEM for faster correlation.
- Review allow-listed partner ranges quarterly.
- Lower challenge thresholds on authentication endpoints during high-risk events.