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Pegasus is the name of a hacking software that was designed by a mysterious company identified as the “NSO Group.” The software was discovered after it was used against a rights activist based in the UAE. Based on this, Apple had to update its software on Thursday in other to safeguard its users. The new iOS version 9.3.5 is a must have for users, because Pegasus is designed in such a way that the phone user will not know that his phone has been hacked.

Mike Murray, a security expert at Lookout, in an interview told Business Insider that Pegasus is tough to detect, and a phone user cannot detect any compromise on his gadget.

Pegasus was discovered on the 10th of August this year via a text message sent to human rights activists Ahmed Mansoor who is based in the UAE. According to him, he received a text message with a link included in the text. Mansoor during his interview with Motherboard said he could tell that the text message was unusual. He said he didn’t click on the link rather he sent it to Bill Marczak, a researcher at CitizenLab. Bill Marczak and Scott-Railton used their phones to click the link, and they tracked what happened next. Murray told BI in an interview that the software is sophisticated, and when the link was clicked the only thing that happened was that Safari browser opened and closed immediately. He added that in the background Pegasus was running, infecting the device and sending data to its creator. The software infects every aspect of the phone including decoding WiFi passwords. Immediately CitizenLab brought in Lookout to assist in discovering the abilities of Pegasus.