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Yandex outage: data shows that instead of going dark, malicious bots moved
TL;DR
Yandex's recent data center strikes led to a drop in traffic, but malicious bots simply shifted to other providers rather than disappearing. Analyzing traffic patterns revealed that while Yandex Search saw a decline in legitimate crawlers, Yandex.Cloud experienced a migration of high-volume automation.
✦ Why It Matters
Evaluate your own infrastructure's resilience against bot migrations and adapt your security measures accordingly.
Key Takeaways
- Analyze request behavior, not just traffic volume.
- Expect malicious automation to migrate quickly after disruptions.
- Monitor for shared fingerprints across different providers.
- Implement WAF rules to protect sensitive endpoints.
Full Summary
Following drone strikes on Yandex data centers, traffic from Yandex's two autonomous systems (ASNs) dropped significantly, with Yandex Search (AS13238) seeing a decline in verified search crawlers and Yandex.Cloud (AS200350) experiencing reduced malicious activities. Analysis using Cloudflare Radar revealed that while Yandex Search's traffic fell by 99%, the malicious automation on Yandex.Cloud simply shifted to other hosting providers.
Before the strikes, automated requests accounted for over 35% of traffic from Russian IPs. Post-event, bot traffic targeting gambling accounts remained stable, indicating that operators quickly migrated their activities.
The findings highlight that a drop in traffic does not equate to a reduction in malicious behavior, emphasizing the need for deeper analysis of request patterns.