On Friday 18 July 2025 at 18:54 UTC, a memcached amplification targeted a online casino customer in the UK. The attack peaked at 210.6 Gbps and lasted 42 minutes. Traffic originated from 1414 autonomous systems in 81 countries, predominantly a headless-browser farm.
| Vector | memcached amplification |
| Peak | 210.6 Gbps |
| Duration | 42 min |
| Time to mitigation | 0.130 s |
| Attack traffic reaching origin | 0.038% |
| Legitimate traffic challenged | 0.03% |
Timeline
The attack was preceded by a ransom note demanding payment in Monero. 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
- Keep origin IPs out of public DNS history.
- Review allow-listed partner ranges quarterly.
- Enable log streaming to your SIEM for faster correlation.