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.[1][2]

ID: S0358
Type: TOOL
Platforms: Windows
Version: 1.0

Techniques Used

Domain ID Name Use
Enterprise T1114 Email Collection Ruler can be used to enumerate Exchange users and dump the GAL.[1]
Enterprise T1137 Office Application Startup Ruler can be used to automate the abuse of Outlook Rules, Forms, and Home Pages to establish persistence.[1]


Groups that use this software: