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81.9.131.168 has a very high threat confidence level of 100%, originating from Galdakao, Spain, on the Euskaltel S.A. network (12338). It has been observed across 155 sessions targeting SSH, with detected attack patterns including ssh authorized keys persistence established, First observed on February 19, 2026, most recently active March 5, 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.