From The New Yorker:
On Tuesday, WhatsApp took the extraordinary step of announcing that it had traced the malware back to NSO Group, a spyware-maker based in Israel, and filed a lawsuit against the company—and also its parent, Q Cyber Technologies—in a Northern California court, accusing it of “unlawful access and use” of WhatsApp computers. According to the lawsuit, NSO Group developed the malware in order to access messages and other communications after they were decrypted on targeted devices, allowing intruders to bypass WhatsApp’s encryption.
NSO strongly denied the allegations saying its licensing agreement forbid any illicit use of its software.