Suspicious New Service Creation

A Sigma rule for process creation on Windows, by Nasreddine Bencherchali (Nextron Systems).

high 1 ATT&CK technique 1 program it names 1 everyday example trips it

What it looks for

its detection, as SigmaHQ writes it

detection:
  selection_posh:
    CommandLine|contains|all:
      - 'New-Service'
      - '-BinaryPathName'
  selection_sc:
    CommandLine|contains|all:
      - 'create'
      - 'binPath='
    Image|endswith: '\sc.exe'
  susp_binpath:
    CommandLine|contains:
      - 'powershell'
      - 'mshta'
      - 'wscript'
      - 'cscript'
      - 'svchost'
      - 'dllhost'
      - 'cmd '
      - 'cmd.exe /c'
      - 'cmd.exe /k'
      - 'cmd.exe /r'
      - 'rundll32'
      - 'C:\Users\Public'
      - '\Downloads\'
      - '\Desktop\'
      - '\Microsoft\Windows\Start Menu\Programs\Startup\'
      - 'C:\Windows\TEMP\'
      - '\AppData\Local\Temp'
  condition: 1 of selection* and susp_binpath

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 Nasreddine Bencherchali (Nextron Systems), 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

Create a service on the page for New-Service

New-Service -Name "TestService" -BinaryPathName 'C:\WINDOWS\System32\svchost.exe -k netsvcs'Identify

Programs and files it names

their pages here

sc.exe

ATT&CK

the techniques it is tagged with

T1543.003Create or Modify System Process: Windows Service

Suspicious New Service Creation

What it looks for

Command lines that trip it

Programs and files it names

ATT&CK

Other rules for T1543.003 Create or Modify System Process: Windows Service