Original article at WSJ ( http://online.wsj.com/article/SB10001424127887323336104578501601108021968.html?mod=googlenews_wsj ) and also at NYT but they are behind paywalls
Alternate articles at The Register ( http://www.theregister.co.uk/2013/05/27/iran_payback_stuxnet_ics_attacks/ ) and at Jerusalem Post ( http://www.jpost.com/Iranian-Threat/News/Report-Wave-of-cyber-attacks-on-US-originating-in-Iran-314308)
Iran is responsible for a wave of computer attacks on US corporations, with targets including oil, gas and electricity companies
Unlike the cyber incursions from China, the goal of the Iranian attacks is sabotage rather than espionage. The cyber attacks are seen as attempts to gain control of critical processing systems.
The attacks on oil, gas and power firms have so far concentrated on accruing information on how their systems work – a likely first step in a co-ordinated campaign that would eventually result in attacks aimed at disrupting or destroying such infrastructure
Sabotaging industrial control systems represents a greater level of sophistication on the part of the attackers and a serious risk to be managed by those energy firms involved."
Link to Original Source