The meaning of the AU chain system “[AU Chain System] You successfully log in in 2018-05-24 22:22:42”

What does AU chain system mean? “[AU Chain System] You successfully log in to 2018-05-24 22:22:42” This is a text message received by the mobile phone. What does it mean? But I haven’t logged in to any system at this time or used mobile phones, computers, etc.

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