Symantec researchers have uncovered several crucial details behind how the cybergang Lazarus, (AKA Hidden Cobra) has successfully conducted dozens of ATM hacks resulting in the machines literally spewing money out on the group’s command.

The FBI and DHS have issued warnings on FASTCash.

What was already known is that the bank robbers inject a malicious Advanced Interactive eXecutive (AIX) executable into a running, legitimate process on the switch application server of an ATM network. These servers are vulnerable and targeted because they are running outdated or unpatched versions of the AIX operating system. The malware is able to create a fraudulent ISO 8583 message, these are the standard for financial transaction messaging.

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