Malicious software used to steal millions from bank accounts has re-emerged a month after US authorities broke up a major hacker network using the scheme, security researchers say. The security firm Malcovery said it identified a new trojan based on the Gameover Zeus malware, which officials said infected up to one million computers in 12 countries, and was blamed in the theft of more than $100 million. This discovery indicates that the criminals responsible for Gameovers distribution do not intend to give up on this botnet even after suffering one of the most expansive botnet takeovers/takedowns in history, Malcovery said in a blog post Thursday. In a status report filed in court, officials said that all or nearly all of the active computers infected with Gameover Zeus have been liberated from the criminals control and are now communicating exclusively with the substitute server established pursuant to court order.