What is it ?

PEGASUS (SPYWARE) : Pegasus is spyware that can be installed on devices running certain versions of iOS, Apple’s mobile operating system and android devices, developed by the Israeli cyberarms
firm, NSO Group.

HOW DOES PEGASUS COME INTO YOUR
PHONE?

The Spyware is transmitted by calling the target phone on WhatsApp.The Spyware enters the phone even if the call is not answered. According to some reports, the log of that call gets erased. According to The Citizens Lab of the University of Toronto, which worked with WhatsApp on identifying spyware victims, this is only one of the ways of delivering Pegasus. It notes several other cases such as alarming SMS that prompt targets to click on a link .

What can it do ?

Pegasus secretly enables a jailbreak on the 
device and can read text messages, track calls, collect passwords, trace the phone location, as well as gather information from apps including 
(but not limited to) iMessage, Gmail,Viber, 
Facebook, WhatsApp, Telegram, and Skype. 

Problem & Solution :

The Facebook-owned messaging service listed the two precautionary measures in a message to users it believed were affected by the sophisticated Pegasus spyware.

How to stay secure: Always use the latest version of WhatsApp and keep your mobile operating system updated to receive the latest security
protections

Facebook’s comment

The message also explained that while WhatsApp had earlier stopped an “advanced cyber actor” from exploiting its video calling service to install spyware in certain mobile phones, there was a possibility that the device in question could have been affected.