1. A malware detection system comprising: sensors that monitor the status of a host computer being monitored for malware, including malware that do not propagate through a network; a feature extractor that extracts data from the sensors corresponding to predetermined features; local detectors that perform malware detection on each stream of feature data from the feature extractor independently; and a data fusion center that uses the decisions from the local detectors to infer whether the host computer is infected by malware.