blue-team-tools/rules/windows/process_creation/proc_creation_win_renamed_binary.yml

title: Renamed Binary
id: 36480ae1-a1cb-4eaa-a0d6-29801d7e9142
status: test
description: Detects the execution of a renamed binary often used by attackers or malware leveraging new Sysmon OriginalFileName datapoint.
author: Matthew Green - @mgreen27, Ecco, James Pemberton / @4A616D6573, oscd.community (improvements), Andreas Hunkeler (@Karneades)
references:
  - https://attack.mitre.org/techniques/T1036/
  - https://mgreen27.github.io/posts/2019/05/12/BinaryRename.html
  - https://mgreen27.github.io/posts/2019/05/29/BinaryRename2.html
date: 2019/06/15
modified: 2022/07/14
logsource:
  category: process_creation
  product: windows
detection:
  selection:
    OriginalFileName:
      - 'Cmd.Exe'
      - 'CONHOST.EXE'
      - 'PowerShell.EXE'
      - 'pwsh.dll'
      - 'powershell_ise.EXE'
      - 'psexec.exe'
      - 'psexec.c'        # old versions of psexec (2016 seen)
      - 'cscript.exe'
      - 'wscript.exe'
      - 'MSHTA.EXE'
      - 'REGSVR32.EXE'
      - 'wmic.exe'
      - 'CertUtil.exe'
      - 'RUNDLL32.EXE'
      - 'CMSTP.EXE'
      - 'msiexec.exe'
      - '7z.exe'
      - 'WinRAR.exe'
      - 'wevtutil.exe'
      - 'net.exe'
      - 'net1.exe'
      - 'netsh.exe'
  filter:
    Image|endswith:
      - '\cmd.exe'
      - '\conhost.exe'
      - '\powershell.exe'
      - '\pwsh.exe'
      - '\powershell_ise.exe'
      - '\psexec.exe'
      - '\psexec64.exe'
      - '\cscript.exe'
      - '\wscript.exe'
      - '\mshta.exe'
      - '\regsvr32.exe'
      - '\WMIC.exe'
      - '\certutil.exe'
      - '\rundll32.exe'
      - '\cmstp.exe'
      - '\msiexec.exe'
      - '\7z.exe'
      - '\WinRAR.exe'
      - '\wevtutil.exe'
      - '\net.exe'
      - '\net1.exe'
      - '\netsh.exe'
  condition: selection and not filter
falsepositives:
  - Custom applications use renamed binaries adding slight change to binary name. Typically this is easy to spot and add to whitelist
  - PsExec installed via Windows Store doesn't contain original filename field (False negative)
level: medium
tags:
  - attack.defense_evasion
  - attack.t1036.003