WASHINGTON — Aleksej Gubarev is a Russian technology entrepreneur who runs companies in Europe and the United States that provide cut-rate internet service. But he is best known for his appearance in 2016 in a dossier that purported to detail Russia’s interference in the 2016 presidential election — and the Trump campaign’s complicity.

Mr. Gubarev’s companies, the dossier claimed, used “botnets and porn traffic to transmit viruses, plant bugs, steal data and conduct ‘altering operations’ against the Democratic Party leadership.”

On Thursday, new evidence emerged that indicated that internet service providers owned by Mr. Gubarev appear to have been used to do just that: A report by a former F.B.I. cyberexpert unsealed in a federal court in Miami found evidence that suggests Russian agents used networks operated by Mr. Gubarev to start their hacking operation during the 2016 presidential campaign.

His networks also appear to have been regularly used by cybercriminals and Russian agents to conduct other attacks, such as an assault on Ukraine’s power grid in 2015, the report found.

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