On Thursday 25 April 2024 at 01:32 UTC, a Slowloris targeted a online casino customer in Southeast Asia. The attack peaked at 585.0 million requests per second and lasted 111 minutes. Traffic originated from 306 autonomous systems in 110 countries, predominantly hijacked home routers.
| Vector | Slowloris |
| Peak | 585.0 million requests per second |
| Duration | 111 min |
| Time to mitigation | 0.635 s |
| Attack traffic reaching origin | 0.080% |
| Legitimate traffic challenged | 0.53% |
Timeline
The attack was preceded by a ransom note demanding payment in Monero. Request rates on the targeted routes exceeded their hourly baseline by a factor of 867 within 7 seconds. The risk score of participating clients crossed the challenge threshold automatically and proof-of-work difficulty rose with origin load.
What the customer saw
The customer’s status page stayed green throughout; they learned about the attack from our notification.
Recommendations
- Lower challenge thresholds on authentication endpoints during high-risk events.
- Enable authenticated origin pulls.
- Keep origin IPs out of public DNS history.