Before superstorm Sandy left many without access to physical branches and ATMs, a bombardment of cyberattacks left many without virtual access — and unlike the storm, these cyberattacks are not going away.

ThreatMetrix Inc., a San Jose, Calif.-based cybercrime prevention vendor, is advising financial institutions that a cyberwar featuring “denial of service” attacks, which shut down access to websites by overwhelming them with more traffic than they were designed to handle, is coming from Iran and other countries through virtual private networks and is increasing in intensity.

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