In 2015, DDoS botnets such as DD4BC grew in prominence, taking aim at financial institutions. Mebroot is a master boot record based rootkit used by botnets including Torpig. Newer botnets fully operate over P2P networks. Botnets are used to conduct distributed attacks. Typically, these botnets operate through Internet Relay Chat networks, domains, or websites. Botnets can be used for many electronic scams. IRC networks use simple, low bandwidth communication methods, making them widely used to host botnets. DNS is the layer at which botnets control drones. Many recent botnets now rely on existing peer-to-peer networks to communicate. Around 2006, to thwart detection, some botnets were scaling back in size. In addition, Prolexic aggregates intelligence information and reports on active botnets and fraud-linked IP addresses. Nazario suspected that different groups operating separate distributed botnets were involved in the attack. These collections of systems compromisers are known as botnets / rootservers. The first botnets on the internet used a client-server model to accomplish their tasks. The RFC 1459 (IRC) standard is popular with botnets.