System Network Connections Discovery Via Net.EXE

A Sigma rule for process creation on Windows, by frack113.

low 1 ATT&CK technique 3 programs it names 2 everyday examples trip it

What it looks for

its detection, as SigmaHQ writes it

detection:
  selection_cli:
    - CommandLine|endswith:
        - ' use'
        - ' sessions'
    - CommandLine|contains:
        - ' use '
        - ' sessions '
  selection_img:
    - Image|endswith:
        - '\net.exe'
        - '\net1.exe'
    - OriginalFileName:
        - 'net.exe'
        - 'net1.exe'
  condition: all of selection_*

The rule’s detection, its selections and fields in order of name. The whole rule, with its references and false positives, is on SigmaHQ, by frack113, under the Detection Rule License 1.1. CmdID evaluates it on a command line alone: a test on what a command line cannot show, such as the parent process or the user, is not met.

Command lines that trip it

everyday examples from tldr-pages, CC BY 4.0, each read by CmdID

Make sure an SMB share is available in the current console on the page for net

net use \\smb_shared_folder /USER:usernameIdentify

Create a persistent mapped network drive using credentials on the page for New-PSDrive

$cred = Get-Credential -Credential Contoso\ServiceAccount
New-PSDrive -Name "S" -Root "\\Server01\Scripts" -Persist -PSProvider "FileSystem" -Credential $cred
Net Use

Identify

Programs and files it names

their pages here

netnet.exenet1.exe

ATT&CK

the techniques it is tagged with

T1049System Network Connections Discovery

System Network Connections Discovery Via Net.EXE

What it looks for

Command lines that trip it

Programs and files it names

ATT&CK

Other rules for T1049 System Network Connections Discovery