PERSOL Process & Technology: the MITERAS mail server was abused to send about 250,000 spam mails

1. 2019-12-02

   From this day, the MITERAS mail server could be used as a relay from outside. [1] [2]

2. 2020-06-02

   From this day to July 20, spam was sent from miteras.jp addresses. [1] [2]

3. 2020-07-18 22:00

   Around this time, the mail server went down. [2]

4. 2020-07-22

   Public disclosure. [1] [2]

About 250,000 spam mails were sent; their subjects and text are not known. The company said no leak of data held in MITERAS had been confirmed. [1] [2]

Outside traffic was blocked and the mail server settings were fixed so it could no longer relay mail. [1]