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UPDATE 3-Personal data of Rio Tinto's Aussie staff may have been hacked - memo

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Investigations indicate Rio Tinto data may be impacted

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Stolen data possibly includes payslips, overpayment letters

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To date, none of the records have been released - memo

(Adds background, details on GoAnywhere)

By Harish Sridharan

March 23 (Reuters) - Personal data of Rio Tinto Ltd's former and current Australian employees may have been stolen by a cybercriminal group, according to a staff memo seen by Reuters on Thursday.

Payroll information, like payslips and overpayment letters, of a small number of employees from January 2023 had possibly been seized by the group, the memo showed.

"Investigations now indicate a possibility that Rio Tinto data may be impacted," it said.

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The cybercriminal group threatened to release the data onto the dark web while investigations into the incident are ongoing, the Anglo-Australian mining giant added.

"To date, none of the records described above have been released, and we still do not know if the cybercriminal group holds these records or not."

The stolen data relates to an attack on GoAnywhere - a managed file transfer (MFT) software offered by U.S. cybersecurity firm Fortra.

A host of global firms and government institutions have reported cybersecurity incidents linked to GoAnywhere MFT over the last few weeks.

Hitachi Energy, a unit of Japanese conglomerate Hitachi said last week that a ransomware attack by the "CL0P" group on GoAnywhere could have resulted in unauthorized access to employee data in some countries.

Last month, Community Health Systems in a U.S. exchange filing confirmed that the personal and medical information of about one million individuals may have been impacted due to a security breach experienced by Fortra.

Fortra did not immediately respond to a Reuters request for comment.

File-sharing software has historically been a target for cybercriminals. Back in 2021, vulnerabilities in the servers of California-based Accellion were exploited by the CL0P group, leading to data breaches in Morgan Stanley, Kroger Co , the Reserve Bank of New Zealand, and other high-profile institutions.

Rio Tinto has not said who is responsible for the latest cyber-attacks.

Rio's shares in London were down 1.6% at 1013 GMT.

(Reporting by Harish Sridharan and Sameer Manekar in Bengaluru; Editing by Sherry Jacob-Phillips, Eileen Soreng an Dhanya Ann Thoppil)