sigmamediumHunting

Suspicious Invoke-WebRequest Execution With DirectIP

Detects calls to PowerShell with Invoke-WebRequest cmdlet using direct IP access

MITRE ATT&CK

command-and-control

Detection Query

selection_img:
  - Image|endswith:
      - \powershell_ise.exe
      - \powershell.exe
      - \pwsh.exe
  - OriginalFileName:
      - powershell_ise.EXE
      - PowerShell.EXE
      - pwsh.dll
selection_commands:
  CommandLine|contains:
    - "curl "
    - Invoke-RestMethod
    - Invoke-WebRequest
    - " irm "
    - "iwr "
    - "wget "
selection_ip:
  CommandLine|contains:
    - ://1
    - ://2
    - ://3
    - ://4
    - ://5
    - ://6
    - ://7
    - ://8
    - ://9
condition: all of selection_*

Author

Nasreddine Bencherchali (Nextron Systems)

Created

2023-04-21

Data Sources

windowsProcess Creation Events

Platforms

windows

References

https://www.huntress.com/blog/critical-vulnerabilities-in-papercut-print-management-software

Tags

attack.command-and-controlattack.t1105

Raw Content

title: Suspicious Invoke-WebRequest Execution With DirectIP
id: 1edff897-9146-48d2-9066-52e8d8f80a2f
status: test
description: Detects calls to PowerShell with Invoke-WebRequest cmdlet using direct IP access
references:
    - https://www.huntress.com/blog/critical-vulnerabilities-in-papercut-print-management-software
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-04-21
tags:
    - attack.command-and-control
    - attack.t1105
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith:
              - '\powershell_ise.exe'
              - '\powershell.exe'
              - '\pwsh.exe'
        - OriginalFileName:
              - 'powershell_ise.EXE'
              - 'PowerShell.EXE'
              - 'pwsh.dll'
    selection_commands:
        CommandLine|contains:
            # These are all aliases of Invoke-WebRequest
            - 'curl '
            - 'Invoke-RestMethod'
            - 'Invoke-WebRequest'
            - ' irm ' # Space before and after to avoid false positives with 'irm' as a substring
            - 'iwr '
            - 'wget '
    selection_ip:
        # In case of FP with local IPs add additional filters
        CommandLine|contains:
            - '://1'
            - '://2'
            - '://3'
            - '://4'
            - '://5'
            - '://6'
            - '://7'
            - '://8'
            - '://9'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium