Tower Semiconductor (NASDAQ:TSEM) says that it identified on Friday an incident that forced it to shut down its information and communications systems.

It did not say whether it was the victim of a ransomware attack.

But Yossi Rachman, Cybereason’s head of security research, believes it was a ransomware attack that targeted multiple companies. “The production floor is very vulnerable and sometimes managers install programs that will make it easier for them to supervise remotely,” he tells Calcalist. “I think that the virus entered via an email of a website and that infected a computer in the organization and reached the control systems. Every second in which production is shut down comes at a financial cost and to get the system back up working is a complex and expensive process.”

Shares are -4.7% this morning in Tel Aviv.


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