County administrators received an alert at 3 a.m. Wednesday that there was a problem.
"IT has been working on it ever since," Fremont County Commission Chair Debbie Bell said Wednesday afternoon.
Employees are not able to use their computers or access emails, but phone systems are still working.
"We have a cyber-attack-specific team on site, a tactical team who deals with these kinds of issues," Bell said. "They are there assessing, figuring out what happened and how to try and fix it."
The Fremont County Administration Building, Garden Park Building, Department of Human Services and Fremont County Sheriff's Office are all closed to the public.
"It did hit the Sheriff's Office, it also hit some of the systems at the dispatch center, but we've got those fixed and corrected," Bell said. "They are up and running again."
However, she said there is no timeline as to when things will be up and running again across the other county offices at this point.
"We are hoping that it is going to go very quickly, but we still don't know," Bell said. "They are still assessing."
Bell said the county does have protocols in place in case of a cyber-attack, which were followed Wednesday morning.
"We shut everything down to stop the damage as was possible," she said. "We sent out a reverse emergency notification to all Fremont County employees early this morning telling them to not use computers and to not log in."
Bell said officials do not believe that personal information has been compromised through the attack at this time.
"If we find out otherwise, our employees will be the first to know," she said. "We are not going to hold that from them, we will tell them immediately if we discover that there are breaches in information."
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