On Monday 9 May 2022 at 03:42 UTC, a credential stuffing targeted a online casino customer in the Nordics. The attack peaked at 390.8 million requests per second and lasted 161 minutes. Traffic originated from 3075 autonomous systems in 41 countries, predominantly a Mirai-derived IoT botnet.
| Vector | credential stuffing |
| Peak | 390.8 million requests per second |
| Duration | 161 min |
| Time to mitigation | 0.180 s |
| Attack traffic reaching origin | 0.028% |
| Legitimate traffic challenged | 0.48% |
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 815 within 25 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
- Enable authenticated origin pulls.
- Lower challenge thresholds on authentication endpoints during high-risk events.
- Review allow-listed partner ranges quarterly.