Ruler is a tool to abuse Microsoft Exchange services. It is publicly available on GitHub and the tool is executed via the command line. The creators of Ruler have also released a defensive tool, NotRuler, to detect its usage.
|Enterprise||T1114||Email Collection||Ruler can be used to enumerate Exchange users and dump the GAL.|
|Enterprise||T1137||Office Application Startup||Ruler can be used to automate the abuse of Outlook Rules, Forms, and Home Pages to establish persistence.|
Groups that use this software:APT33