AT&T said it was approached by investigators for Mueller late previous year, shortly before its contract with Cohen expired.
The New York Times reported Tuesday that Swiss drug company Novartis, AT&T and a Russian oligarch with ties to Russian President Vladimir Putin paid Cohen through a shell company called Essential Consultants LLC.
On Wednesday, Korea Aerospace Industries (KAI) said it paid for accounting-related services, while Novartis cited healthcare consulting.
Special counsel Robert Mueller's investigators have questioned Vekselberg about the payments that his U.S. affiliate made to Cohen, a source familiar with the matter has told CNN.
The probe was prompted by a tip from the office of Special Counsel Robert Mueller, who has been looking into Russian interference in the 2016 election, but the authorities have not said what crimes Cohen is suspected to have committed.
Novartis and AT&T have since confirmed they paid Cohen to gain insight or access into the Trump administration.
The report also claimed Novartis paid Cohen's company almost $400,000.
Cohen's attorneys argue that Avenatti, in his report, used bank records and information about a Michael Cohen who is a Canadian in Tanzania and another Michael Cohen in Israel.
Daniels' attorney, Michael Avenatti, wrote on Twitter on Tuesday that Cohen had accepted $500,000 from a Russian oligarch and that money may have been used as reimbursement for Cohen's payment to Daniels. She has sued both Trump and Cohen.
CNN reviewed documents that appear to show those payments.
Cohen's company, Essential Consultants LLC, received the money from a US offshoot of the business empire of Russian oligarch Viktor Vekselberg, lawyer Michael Avenatti claimed in a report he released Tuesday.
"Mr. Avenatti has published some information that appears to be from Mr. Cohen's actual bank records, and Mr. Cohen has no reason to believe that Mr. Avenatti is in lawful possession of these records", the filing said.
Dust storm hits Delhi, adjoining regions, causes power cuts, uproots trees
Meanwhile, the weather remained generally dry today and winds remained calm in most parts of Punjab and Haryana. It said that all evening schools (second shift, which starts from the afternoon) will remain closed on Tuesday.
Among the transactions reported by The Times was a $500,000 payment a year ago to Cohen from Columbus Nova, which according to public documents is described as a US-based affiliate of Renova Group, a company founded by Russian billionaire Viktor Vekselberg.
Vekselberg's Renova Group is the biggest client of Columbus Nova, but not its owner, the statement said.
A lawyer for Columbus Nova has said Vekselberg had nothing to do with the transaction Avenatti said amounted to $500,000.
AT&T told employees Wednesday in a memo that it had hired Cohen as one of several consultants to "help us understand how the President and his administration might approach a wide range of policy issues important to the company, including regulatory reform at the FCC, corporate tax reform and antitrust enforcement". A onetime personal-injury lawyer and investor in the New York City taxi business, Cohen has no background in the health-care or telecommunications industries. With the news making the rounds, late night host Stephen Colbert made sure to chime in.
Essential Consultants, according to the report, received large sums of money from companies with an interest in Trump administration business.
In a statement, Novartis said it entered into a one-year agreement with Essential Consultations in February 2017.
AT&T is trying to buy media conglomerate Time Warner for $85 billion.
Avenatti's material suggests the Treasury Department and the special counsel's office have bank and other records documenting wire transfers.
By choosing not to communicate directly with elected officials on behalf of corporate clients, consultants are not required to register with the government and report lobbying. The White House denies the tryst occurred.
The U.S. Treasury Department's inspector general's office said on Wednesday it opened an investigation into whether confidential banking records involving Cohen may have been leaked.
The revelation also drew attention to another potential line of inquiry in U.S. Special Counsel Robert Mueller's investigation of Russian meddling in the 2016 U.S. election and potential collusion by Trump's campaign.
"I'm not going to get into somebody else's qualifications".