Hackers managed to steal $80m (£56m) from Bangladesh's central bank because it skimped on network hardware and security software, reports Reuters.
The bank had no firewall and used second-hand routers that cost $10 to connect to global financial networks.
Better security and hardware would have hampered the attackers, Reuters said, quoting an official investigator.
The hackers aimed to steal $1bn but made mistakes that led to the theft being spotted and stopped.
$10 router blamed in Bangladesh bank hack - BBC News