GMO Aozora Net Bank Halts Banking API Twice After Attacks
GMO Aozora Net Bank suspended its banking API twice between the night of Nov. 10 and the morning of Nov. 11 after detecting unauthorized traffic. No data leak or fund loss occurred.
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giftdetect· the right gift in minutesGMO Aozora Net Bank temporarily shut down its banking API service twice between the night of November 10 and the morning of November 11, after detecting unauthorized external traffic aimed at its API connection platform. The bank described the move as a precautionary measure to ensure safety. It says no personal information was leaked and no funds were improperly withdrawn.
Two suspensions in one night
The first suspension began at 8:42 p.m. on November 10. Once the bank confirmed the suspicious traffic had subsided, it restored service at 10:30 p.m.
The unauthorized traffic returned, however. The bank halted the API again at 1:02 a.m. on November 11 and brought it back at 6:25 a.m., after confirming it was safe to do so.
Knock-on effects for partner services
The outages also hit external services that rely on the bank's API. At crypto exchanges including Binance Japan and Coincheck, yen deposits through GMO Aozora Net Bank were temporarily unavailable. The cloud accounting service freee also paused its "freee Furikomi" transfer feature for a time.
What comes next
Citing a recent rise in cyberattacks worldwide, the bank says it will keep its monitoring setup in place. It also warned that it may suspend some services again as a precaution.
The incident adds to a run of security problems at Japanese financial and online services. For businesses and individuals who depend on bank APIs for deposits, transfers and accounting, it shows how a protective shutdown at one bank can quickly disrupt many connected services.
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