On following page of our Marvel's Spider-Man's solution you will find a description of Spider-Hack mission. Peter has to invade the Oscorp building in stealth way - which is not going to be easy, given the number of security measures in the building.
Go to the marker and press R3. You will reveal the hidden wires - go a bit higher and start hacking the first box. Your actions will alert the guards. They will begin searching the building. Climb upwards and avoid lasers. If you are detectable in any way, the mission will fail.
You will finally reach the second module. As before, approach it and let Peter break into it. The guards will be even more vigilant - the building will be monitored by drones. Go along the cable and you will remain undetectable.
When you hack another box, the helicopters will join the search. Climbing will be difficult again - remember that you can use R2 to speed up Peter's movements and move quickly when the path is safe.
After another hacking, enter the building through the shaft above the door. Go to Osborn's office and search the data on his computer. After reviewing all the slides, the mission ends and you'll get 3000 XP.