"We believe the intention of the attack was to disable infrastructure, more specifically servers, as opposed to looking to steal information", a source told the LA Times.
The Los Angeles Times, San Diego Union-Tribune, Chicago Tribune and Baltimore Sun were among the major newspapers that had printing issues on Saturday. We apologize for any inconvenience and thank our readers and advertising partners for their patience as we investigate the situation.
"There is no evidence that customer credit card information or personally identifiable information has been compromised", Dearborn wrote.
All papers within The Times' former parent company, Tribune Publishing, experienced glitches with the production of papers.
It also hit the distribution of the West Coast editions of the New York Times and Wall Street Journal, which are printed at the LA Times' printing plant.
The Chicago Tribune, which also reported on the disruption of its own operations, called it a computer virus.
Forbes reports that the malware Tribune Publishing discovered was a version of the Ryuk ransomware family, which is often attributed to the Lazarus Group. The U-T said it plans to deliver the Saturday edition with Sunday's edition to print subscribers. "We are doing everything we can to restore full service and to continue to make our journalism available to you both in print and digitally", Light's statement read.
And staffers at some of the affected papers said they haven't received much information from management about the extent of the cyberattack. The papers had previously been part of Tronc, the previous name of Tribune Publishing.
The San Diego Union-Tribune is said to have been hit particularly hard, as 85 to 90 percent of its Saturday edition didn't reach its subscribers.