Attack On Qatar State News Agency
In 2017, during the blockade, there was a breach on the Qatar State News Agency. The attackers were suspected to be from Saudia Arabia, they wrote hateful things towards the Amir on the website. After the breach, Al Jazeera investigated the breach.
Attack on Qatar National Bank
In 2016, QNB suffered from a major data leak, around 1.4 GB was leaked online. Information like card numbers, passwords, or even personal information was posted online.
References:
https://www.bankinfosecurity.com/qatar-national-bank-suffers-massive-breach-a-9068
https://www.cyberlands.io/topsecuritybreachesqatar