Intsights, an Israeli security and internet information company, told local media that he discovered plans for future ISIS attacks after hacking in an ISIS forum used by the group to plan attacks.
The company reported on the Israeli television station Channel 10 that he discovered a forum hosted on the Dark Web, using Telegram encryption, where ISIS members were posting content related to upcoming attacks. 
The forum also had a list of past attacks claimed by ISIS, such as the one on a church in Saint-Étienne-du-Rouvray, in the north France, where two ISIS members killed an 85-year-old Catholic priest.
The Israeli security company reports that ISIS members are planning a series of attacks on various military bases in the United States.
There were maps with US military bases from around the world on the forum, and Intsights reports that it has discovered plans for attacks on selected locations in Kuwait, Bahrain and Saudi Arabia.
These bases were not chosen accidentally as the US and its allies use them for air raids against ISIS in Syria and Iraq.
Let's say that Intsights is a company run by former Israeli forces intelligence officers. They do not, of course, mention how they were able to break the ISIS forum, but that should probably be expected.
So because some think there is security in the Internet, even through the anonymous TOR network.
