A still-active cybercriminal gang has stolen up to a $ 1 billion from banks in at least 25 countries over the last two years, infiltrating networks with malware and spying on employees’ computers to facilitate large wire transfers, Kaspersky Lab said Sunday.

The computer security vendor, which said it will release a report Monday on its findings, said the gang penetrated deeply into the banks’ networks, taking time to learn about internal procedures to make their fraudulent activity less suspicious.

In some cases, the gang learned about wire transfer systems by watching administrators’ computers over video.

“In this way the cybercriminals got to know every last detail of the bank clerks’ work and were able to mimic staff activity in order to transfer money and cash out,” Kaspersky said in a news release.

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