On this page of the Watch Dogs Legion guide, you will learn how to complete the next Malik dossier mission from the SIRS chapter. This is one of the longer missions, which involves hacking all the systems that Malik has access to.
Go to the DedSec meeting, which will take place in your safe house. When the meeting is over, a new marker will appear on the map. Head towards it.
While you're at it, watch out for the lasers that trigger the alarm. Take control of a nearby camera and turn off the alarm. You don't have to go inside the building, all you have to do is take control of the cameras on the roof.
Find the crate on the roof and try to hack it. A puzzle you need to solve will appear. Start from the left side, switching nodes in the appropriate way. If you can't see them, remember to zoom in on the camera. Once you've connected all the nodes, download the data from the box.
Before entering the building, it is worth changing into the operator, who has such skills as faster health recovery or at least has good weapons. At this point, it is also worth investing your technology points in the ability to Betray various combat drones. Once you've done that, go inside, defeat the guards, and head for the elevator.
Go to the terminal so Bagley can access the systems. Then destroy the seven drones inside. Once you do, go to the three servers and interact with them. At this point, the data will be downloaded, which will take about 1.5 minutes. However, the download will be stopped every time the server is attacked by drones.
Moreover, from time to time there will be guards that you will have to eliminate. Use your gadgets and skills to betray drones. Go to each server where the tag appears. This will mean that the server is attacked by a drone. You can destroy drones, disable them, or use them for your own purposes through Drone Betray.
When the download is complete, connect Bagley to the FILAMENT. Then a cutscene will appear, and when it is over, you will complete the entire mission.