The Securities and Exchange Commission doesn't usually investigate cyberattacks, but it's making an exception this time to hunt for a group of hackers known as FIN4. The group reportedly breaks into companies' email accounts to find corporate secrets and info, such as mergers, that can be used to game the stock market. According to Reuters, the agency has asked at least eight companies for detailed accounts of the security breach they experienced in the past few years in an effort to find the suspects. Security company FireEye Inc. first published a report about the hackers back in 2014, where it revealed some of the tricks they used to steal info. One of them is phishing for executives' and lawyers' log-in credentials through fake Microsoft Outlook home pages. They also use confidential info they dig up to persuade market insiders to divulge more secrets.