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210.172.173.61 has a very high threat confidence level of 95%, originating from Japan, on the GMO Internet Group, Inc. network (7506). It has been observed across 35 sessions targeting SSH, with detected attack patterns including ssh authorized keys persistence established, First observed on February 4, 2026, most recently active March 4, 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.