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39.99.230.51 has a threat confidence score of 80%. This IP address from China (AS37963, Hangzhou Alibaba Advertising Co.,Ltd.) has been observed in 16 honeypot sessions targeting SSH protocols. Detected attack patterns include ssh authorized keys persistence established. First observed on January 22, 2026, most recently active March 28, 2026.
Removal of filesystem attribute protections from the user’s .ssh directory followed by deletion and recreation of the directory and insertion of a new public key into authorized_keys. This pattern reflects deliberate modification of SSH trust configuration to establish persistent key-based access.