Financial malware authors are trying to evade new online banking security systems by returning to more traditional phishing-like credential stealing techniques, according to researchers from security firm Trusteer. Most financial Trojan programs used by cyber criminals today are capable of tampering in real time with online banking sessions initiated by victims on their computers. This includes the ability to execute fraudulent transactions in the background and hide them from the user by modifying the account balance and transaction history display in their browser.