Ok playing around in xterm:

~ $ dpkg --search /usr/sbin/icd2
icd2: /usr/sbin/icd2


So we know the executable lives in a package called icd2.

~ $ dpkg --status icd2
...
...
Description: Internet connectivity daemon
...

So it's part of the internet system on the phone. Either it's bugged and running out of control, or some other program is bugged and keeping it busy. What other programs are you runnung? Are you logged on to any instant messaging system?