Prosecutors in São Paulo have launched an investigation into an alleged Sept. 2 data breach at credit bureau Boa Vista SCPC, a company that maintains a credit history database for millions of Brazilians, Folha de S.Paulo reported.
Investigators are analyzing computer systems to gauge the extent of the incident, "which could have affected more than 350 million registries," the federal prosecutor's office said in a statement.
Boa Vista, meanwhile, has not confirmed the attack but is reportedly conducting an internal investigation into the matter.
Hacking group Fatal Error recently published a message claiming to have gained access to Boa Vista's database, according to the earlier reports. "We do not post any information from any Brazilian, because we cherish their privacy," the group reportedly said as it urged Brazilians to change "all your passwords soon."