Titan Rain

Overview
Titan Rain was the U.S. government's designation given to a series of coordinated attacks on U.S. computer systems since 2003. The attacks were labeled as Chinese in origin, although their precise nature (i.e., state-sponsored espionage, corporate espionage, or random hacker attacks) and their real identities (i.e., masked by proxy, zombie computer, spyware/virus infected) remain unknown. The activity known as "Titan Rain" is believed to be associated with an Advanced Persistent Threat.