Why so abnormal? Detecting domains receiving anomalous surge traffic in a monitored network.

Anomalous traffics are those unusual and colossal hits a non-popular domain gets for a small epoch period in a day. Regardless of whether these anomalies are malicious or not, it is important to analyze them as they might have a dramatic impact on a customer or an end user. Identifying these traffic anomalies is a challenge, as it requires mining and identifying patterns among huge volume of data. In this paper, we provide a statistical and dynamic reputation based approach to identify unpopular domains receiving huge volumes of traffic within a short period of time. Our aim is to develop and deploy a lightweight framework in a monitored network capable of analyzing DNS traffic and provide early warning alerts regarding domains receiving unusual hits to reduce the collateral damage faced by an end-user or customer. The authors have employed statistical analysis, supervised learning and ensemble based dynamic reputation of domains, IP addresses and name servers to distinguish benign and abnormal domains with very low false positives.