Odd string in Bad Username report

Odd string in Bad Username report

I am getting several hundred hits a week in the report for the attempt to use the following username:

@@CyBAAAAUBQYAMHArBwUAMGAoBQZAQGA1BAbAUGAyBgOAQFAhBwcAsGA6AweAEDABBwQAIEA4AQNAgDA0AQLAIDA5AARAcDAtAANAQDA4AwMA0CA5AQQAIEACBQLAgDABBwQAkDAyAwMAYDAEBAMAUDA5AgMA0HA

Any idea what this is?  I don't see how/why malware or a virus would be trying such a large string to brute force access to anything.




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