German prosecutors Friday launched a spying investigation into phishing attacks targeting lawmakers on the Signal messaging app, with an MP saying the latest Russia-directed plot against Germany was a "wake-up call."

The attacks work by sending messages purporting to come from Signal support.

Victims are urged to hand over sensitive account information, which the attackers can then use to gain access to the victim’s chat groups and messages.

When the scam is successful, the hackers gain access to photos and files shared on Signal and can also impersonate the person whose account was compromised.