Pegasus spyware essentially makes everything on a phone accessible.
"Once a phone is infected [with Pegasus spyware], the customer has full access to a victim's personal files, such as chats, emails, and photos. They can even surreptitiously use the phone's microphones and cameras to view and eavesdrop on their targets," according to Citizen Lab.
Multiple other Saudi dissidents say they've been targeted by Pegasus hacks .
Human rights activist Yahya Assiri and comedian Ghanim al-Masarir are among those targeted in recent years, according to Human Rights Watch.
The hashtag was started by Saud al-Qahtani, the Saudi government's former director of cybersecurity, using his official Twitter account.
The tweet was screenshotted by the news outlet Bellingcat.