More than 31,000 online banking credentials belonging to Australian customers of the country's Big Four banks are circulating on messaging platform Telegram and the dark web -- often shared for free, according to cybersecurity experts.

Cyber intelligence firm Dvuln uncovered the breach, revealing that the credentials include passwords from at least 14,000 Commbank customers, 7,000 ANZ users, 5,000 NAB clients, and 4,000 from Westpac, reported ABC.

Despite the fraud prevention systems in place at Commonwealth Bank, ANZ, NAB, and Westpac, security analysts warn that victims face a real risk of financial loss.

The stolen data was traced back to infostealer malware -- malicious software that secretly infected devices and funneled sensitive information back to........

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