The attack comes five weeks after Ukraine’s power grid was successfully disrupted in what’s believed to be the world’s first-known hacker-caused power outage. Researchers still aren’t sure if the malware known as BlackEnergy was the direct cause of the blackout, but they have confirmed the malicious package infected at least three of the regional power authorities that were involved in the outage. Researchers have since said the attack was extremely well coordinated.

Source : Israel’s electric authority hit by “severe” hack attack (Updated) | Ars Technica