Wireshark is not included by default within EksilPup to keep the ISO image size down.
Wireshark can easily be installed by following the guide below.
Note that for security Wireshark is best run as a non-root user. EksilPup by default runs as root.
To run Wireshark as a non-root user open a terminal and run the command below:
run-as-spot wireshark