Russian hackers are targeting Signal and WhatsApp accounts, says US's FBI

FBI and CISA issued a joint warning about attackers impersonating support accounts on messaging apps, fBI and CISA joint statement warned about impersonation scheme on messaging apps.

Victims had thousands of accounts breached on widely used messaging apps targets included US government officials, military personnel, politicians, and journalists.

Attackers asked users to provide verification codes or PINs via impersonated support accounts, example involved an account named 'Signal Support' instructing a user to reply with a verification code.

Hackers exploited compromised accounts to continue attacks by messaging victims' contacts hackers used stolen access to force victims out and send phishing links to contacts.

FBI and CISA advised treating unknown messages with suspicion and using app security features, fBI and CISA recommended immediate blocking and reporting of unknown messages and enabling security features.