The Wannacry cyber security ransomware hackers have tried to conceal who they are by using a virtual currency that is more anonymous than Bitcoin.
Victims paid more than £107,000 in bitcoins to recover files scrambled by Wannacry.
Earlier this week the gang behind the attack started to move the bitcoins out of the wallets they were paid into.
But the operators of the exchange they used to swap the bitcoins have now frozen the accounts they used.
Wannacry caught out thousands of firms around the world when it infected computers on corporate networks and encrypted their files, making them useless.
Victims were told to pay between £229 and £458 in bitcoins to have their files unscrambled and return computers to a working state.
Many security experts believed the money paid into three bitcoin wallets set up by the Wannacry creators would never be moved, because there was so much attention focused on who was behind the attack.
Moving the cash might expose key details about the attackers that could be used to track them down.
Whilst no one knows who owns the 3 accounts- the details of the acounts are known to the blockchain community as they can track the specific accounts.
But the bitcoins were moved earlier this week and some were piped to an exchange network called Shapeshift.io in an attempt to convert them to another virtual currency called Monero.
The Monero crypto-currency was set up to be more anonymous than Bitcoin and seeks to hide as much information as possible about every transaction.
The Wannacry gang is believed to have chosen Shapeshift.io for the digital cash transfer because the service can be used without signing up for an account.
However, the attempt to launder the cash via the platform seems to have been thwarted soon after Shapeshift was told what was happening.
Shapeshift said it would block any further attempts to change the Wannacry bitcoins into Monero or any other crypto-currency.
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