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Remote Services: SMB/Windows Admin Shares

Description from ATT&CK

Adversaries may use Valid Accounts to interact with a remote network share using Server Message Block (SMB). The adversary may then perform actions as the logged-on user.

SMB is a file, printer, and serial port sharing protocol for Windows machines on the same network or domain. Adversaries may use SMB to interact with file shares, allowing them to move laterally throughout a network. Linux and macOS implementations of SMB typically use Samba.

Windows systems have hidden network shares that are accessible only to administrators and provide the ability for remote file copy and other administrative functions. Example network shares include

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C$
,
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ADMIN$
, and
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IPC$
. Adversaries may use this technique in conjunction with administrator-level Valid Accounts to remotely access a networked system over SMB,(Citation: Wikipedia Server Message Block) to interact with systems using remote procedure calls (RPCs),(Citation: TechNet RPC) transfer files, and run transferred binaries through remote Execution. Example execution techniques that rely on authenticated sessions over SMB/RPC are Scheduled Task/Job, Service Execution, and Windows Management Instrumentation. Adversaries can also use NTLM hashes to access administrator shares on systems with Pass the Hash and certain configuration and patch levels.(Citation: Microsoft Admin Shares) https://www.aleksandrhovhannisyan.com/blog/how-to-add-a-copy-to-clipboard-button-to-your-jekyll-blog/

Atomic Tests

Atomic Test #1 - Map admin share

Connecting To Remote Shares

Supported Platforms: windows

auto_generated_guid: 3386975b-367a-4fbb-9d77-4dcf3639ffd3

Inputs:

Name Description Type Default Value
user_name Username String DOMAIN\Administrator
share_name Examples C$, IPC$, Admin$ String C$
password Password String P@ssw0rd1
computer_name Target Computer Name String Target

Attack Commands: Run with command_prompt!

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cmd.exe /c "net use \\#{computer_name}\#{share_name} #{password} /u:#{user_name}"

Atomic Test #2 - Map Admin Share PowerShell

Map Admin share utilizing PowerShell

Supported Platforms: windows

auto_generated_guid: 514e9cd7-9207-4882-98b1-c8f791bae3c5

Inputs:

Name Description Type Default Value
share_name Examples C$, IPC$, Admin$ String C$
map_name Mapped Drive Letter String g
computer_name Target Computer Name String Target

Attack Commands: Run with powershell!

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New-PSDrive -name #{map_name} -psprovider filesystem -root \\#{computer_name}\#{share_name}

Atomic Test #3 - Copy and Execute File with PsExec

Copies a file to a remote host and executes it using PsExec. Requires the download of PsExec from https://docs.microsoft.com/en-us/sysinternals/downloads/psexec.

Supported Platforms: windows

auto_generated_guid: 0eb03d41-79e4-4393-8e57-6344856be1cf

Inputs:

Name Description Type Default Value
command_path File to copy and execute Path C:\Windows\System32\cmd.exe
remote_host Remote computer to receive the copy and execute the file String \localhost

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

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psexec.exe #{remote_host} -accepteula -c #{command_path}

Atomic Test #4 - Execute command writing output to local Admin Share

Executes a command, writing the output to a local Admin Share. This technique is used by post-exploitation frameworks.

Supported Platforms: windows

auto_generated_guid: d41aaab5-bdfe-431d-a3d5-c29e9136ff46

Inputs:

Name Description Type Default Value
output_file Remote computer to receive the copy and execute the file String output.txt
command_to_execute Command to execute for output. String hostname

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

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cmd.exe /Q /c #{command_to_execute} 1> \\127.0.0.1\ADMIN$\#{output_file} 2>&1

source