You are
possibly still too broad.
Though I think probably
the first of these two answers (scorpion) is the intended one.
You could be
a scorpion.
I have no cousins in Antarctica.
Scorpions can be found on every continent except Antarctica.
I have no skeleton but have exoskeleton.
Scorpions: Exoskeleton, check. Skeleton? Negative.
I glow like the moon.
Many species of scorpions glow when exposed to UV light.
I prefer night to day.
Scorpions are nocturnal.
I can turn my prey into liquid.
Scorpions extrude their digestive juices onto their prey, then take it in in liquefied form.
I can spend in a freezer overnight.
Scorpions can sometimes survive being frozen.
I have more eyes but useless.
Many scorpions have multiple sets of eyes. A few species are blind, though most are not.
I am venomous.
Yep, don't mess with the scorpion.
Hint
One of my parts is used as security software.
Stinger is a McAfee program that targets certain computer viruses.
Or you could be
A toxic glowing millipede of the genus Motyxia

I have no cousins in Antarctica.
there are no millipedes of any kind in Antarctica.
I have no skeleton but have exoskeleton.
The millipede has an exoskeleton.
I glow like the moon.
This is a bioluminescent genus.
I prefer night to day.
They are nocturnal.
I can turn my prey into liquid.
They eat vegetation partially which is broken down by saliva.
I can spend in a freezer overnight.
but it wouldn't end well.
I have more eyes but useless.
They are blind.
I am venomous.
They produce cyanide.