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39.99.250.21 has a very high threat confidence level of 99%, originating from Beijing, China, on the Hangzhou Alibaba Advertising Co.,Ltd. network (37963). It has been observed across 51 sessions targeting REDIS, with detected attack patterns including redis full cron persistence exploitation chain, First observed on January 21, 2026, most recently active February 28, 2026.
Identifies a complete Redis exploitation workflow where an attacker performs configuration introspection, modifies snapshot directory and filename parameters (CONFIG SET dir, CONFIG SET dbfilename), targets system cron directories (e.g., /etc/cron.d, /etc, crontabs), implants scheduled execution payloads (HTTP pipe-to-shell, wget, root cron variants, or obfuscated droppers), and triggers SAVE to write the malicious cron file to disk. This tightly coupled sequence reflects automated host-level persistence establishment via cron injection through misconfigured or unauthenticated Redis services. The behavior captures filesystem redirection, scheduled execution staging, and persistence activation in a single deterministic chain, strongly associated with botnet propagation and cryptomining campaigns.