The Chicago Tribune and other Tribune Publishing newspapers on Sunday continued to experience issues associated with a malware attack, and some content likely will be missing from Monday’s papers, the Chicago-based company said.  Sunday print editions were delivered in its markets across the U.S. but did not contain classified ads and some paid death notices, which share a common system disrupted by the malware, the Chicago-based company said Sunday.

A source familiar with the investigation said the malware has been identified as Ryuk ransomware, which was highlighted as a threat associated with overseas hackers in an August government cybersecurity report. There was no ransom demand made, the source said.   All Tribune Publishing newspapers were impacted by the malware, with the South Florida Sun Sentinel among those unable to produce its paper in time for Saturday delivery. Those newspapers were delivered on Sunday, the company said.