[ubuntu] a.out executable in home directory - has bash strings

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http://ubuntuforums.org – Hi all, Today I noticed an a.out executable file in my user home directory. I checked it with ghex and has bash strings. Size is a bit less than /bin/bash and buildId as reported by 'file' is the same for both files. File date is 2013-01-23, and I'm sure I haven't compiled bash in this machine ever :) dpkg -S a.out only reports header files I have ubuntu 12.04 updated with the latest security updates. I uploaded the file to virustotal.com with no detections so far. Any hint about what can be this file and how did it arrive to my home directory? Thanks a lot Eneko (Hardware)