On Thursday 18 June 2026 at 07:43 UTC, a UDP reflection (NTP) targeted a healthcare portal customer in Southeast Asia. The attack peaked at 30.1 Gbps and lasted 84 minutes. Traffic originated from 190 autonomous systems in 111 countries, predominantly mobile carrier ranges.
| Vector | UDP reflection (NTP) |
| Peak | 30.1 Gbps |
| Duration | 84 min |
| Time to mitigation | 0.613 s |
| Attack traffic reaching origin | 0.069% |
| Legitimate traffic challenged | 0.09% |
Timeline
The attack was preceded by an extortion email received two days earlier. Edge packet filters identified the flood by source port and payload signature and dropped it at line rate across 14 points of presence.
What the customer saw
Checkout conversion was unchanged compared with the same hour of the previous week.
Recommendations
- Review allow-listed partner ranges quarterly.
- Lower challenge thresholds on authentication endpoints during high-risk events.
- Keep origin IPs out of public DNS history.
This matches what we see in iGaming around big matches.
The billing model is what got our finance team on board, honestly.
Could you share the dataset behind the percentages?
Thanks — sharing this with our on-call team.
Solid runbook advice. The DNS-at-2am point hit home.
Verified good bots and allow-listed partners bypass challenges entirely.