cyber liability insurance is a policy designed to protect an insured business against the risks associated with online activities. These risks may include getting sued for transmission of a virus or accidently posting personal client information on the web or defaming a third party on your company blog or a social network.
Insurers who provide this cover have their own cyber liability insurance policy documents/wordings - all of which are individual and different.
Talk to a broker - ideally a cyber liability specialist or direct to major insurers to find a policy that suits your requirements.
Beware to read the policy document - especially the exclusions before you buy!