More than $140,000 has been stolen since December of 2010 from private cash machines in Chicago installed by Maryland-based ATM Systems, NBC Chicago reports. The thieves used special codes to reprogram the machines to dole out more money than they should during a transaction. When asked for one hundred dollars, the ATM would give out one hundred twenties. Surveillance cameras captured images of the bandits, and they can be found at the link above.
After their fraudulent transactions the robbers would return the machines to their normal state so that no one would know there was anything unusual happening. ATM systems said the heists are most likely an inside job. The menus on all of the affected machines, often in hotel lobbies, have been permanently altered to prevent further tampering.