Malware threats have become very common these days. In the past, many honeypots have been created to detect malware propagation over the network. These honeypots trick the malware into believing that they are a part of the network.
These honeypots are however isolated and once they have been infected, they can be used to study the behaviour of the malware. Network based malware have always been more successful, given the large number of systems they can affect in a short period of time.