Cybercriminals have stolen up to $1 billion since late 2013 from banks across 30 countries, including the U.S., Russia, Europe and China, a computer security company says in the latest report to draw a red circle around the financial sector as a vulnerable target for hackers.

The majority of brokerages (88%) and financial advisers (74%) said they “have experienced cyberattacks directly or through one or more of their vendors.” But only a small portion of the more than 100 firms surveyed — 15% of broker dealers and 9% of advisers — guarantee they’ll reimburse clients for losses related to a cyberattack, the Securities and Exchange Commission found.