bash_history file with vipw

Dear Group,

I have just installed the new WU-FTPD on one of our Solaris servers.
It is in a chroot'ed environment and accessible for only one
guest-user. That guest-user uses /bin/false as "shell".

I was very confused when I found a .bash_history file in its
homedirectory, which contains the following:

=09vipw
=09exit
=09telnet 127.1
=09vipw
=09exit
=09pwd
=09exit

Is this normal behaviour, or do I have to worry that somebody has been
snooping around?

Thank you and kind greetings,

Wim