Through the years of analyzing identity compromises in the cloud, Fortinet researchers have seen the same attackers pop up regularly, some more frequently than others. Among the more prolific ones they’ve come to know is one they’ve dubbed “EC2 Grouper”. Over the past couple of years, they’ve seen this actor in several dozen customer environments, making them one of the more active groups we’ve tracked.
This usual suspect is attributed by their penchant for using similar user agents and the same security group naming convention in their attacks. While indicators such as user agents and even security group names can assist in attribution and hunting, Fortinet have found them unreliable for comprehensive threat detection.
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Source: Fortinet
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