Permission Groups Discovery
Adversaries may attempt to find local system or domain-level groups and permissions settings.
Examples of commands that can list groups are
net group /domain and
net localgroup using the Net utility.
On Mac, this same thing can be accomplished with the
dscacheutil -q group for the domain, or
dscl . -list /Groups for local groups.
On Linux, local groups can be enumerated with the
groups command and domain groups via the
Helminth has checked for the local admin group domain admin group and Exchange Trusted Subsystem groups using the commands
Kwampirs collects lists of local accounts with administrative access, local group user accounts, and domain local groups with the commands
OilRig has used
Sys10 collects the group name of the logged-in user and sends it to the C2.
Identify unnecessary system utilities or potentially malicious software that may be used to acquire information about groups and permissions, and audit and/or block them by using whitelisting  tools, like AppLocker,   or Software Restriction Policies  where appropriate. 
System and network discovery techniques normally occur throughout an operation as an adversary learns the environment. Data and events should not be viewed in isolation, but as part of a chain of behavior that could lead to other activities, such as Lateral Movement, based on the information obtained.
Monitor processes and command-line arguments for actions that could be taken to gather system and network information. Remote access tools with built-in features may interact directly with the Windows API to gather information. Information may also be acquired through Windows system management tools such as Windows Management Instrumentation and PowerShell.
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