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191.37.78.81 has a threat confidence score of 75%. This IP address from Brazil (AS263356, CNT Fiber) has been observed in 6 honeypot sessions targeting SSH protocols. Detected attack patterns include ssh authorized keys persistence established. First observed on March 7, 2026, most recently active March 8, 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.