Chinese state-sponsored actors searched document repositories for specific information such as, system manuals, remote terminal unit (RTU) sites, personnel lists and personnel lists. This can include sensitive data such as specifications, schematics, or diagrams of control system layouts, devices, and processes. Examples of information repositories include reference databases or local machines in the process environment, as well as workstations and databases in the corporate network that might contain information about the ICS. The worm collects AutoCAD files with drawings from information repositories.”]
Source: https://collaborate.mitre.org/attackics/index.php/Technique/T0811