The G1 news portal says the site, www.Micheltemer.Com.Br, is maintained by President Michel Temer's party. It usually carries news about the president but is not an official government site.
A banner in English at the top of the site today read, "Exploited by Anarchy Ghost." Below a picture of a grimacing Temer, the hackers wrote in Portuguese that they wanted "the death penalty for whoever is in Congress."
Watchdog groups estimate 60 percent of lawmakers in Brazil's Congress are under investigation, and every week seems to bring a new arrest in an investigation into kickbacks at the state-run oil company Petrobras.