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57.131.21.211 has a threat confidence score of 87%. This IP address from Italy (AS16276, OVH SAS) has been observed in 9 honeypot sessions targeting SSH protocols. Detected attack patterns include ssh authorized keys persistence established. First observed on April 16, 2026, most recently active April 17, 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.