Potential SAP NetViewer Webshell Command Execution

title: Potential SAP NetViewer Webshell Command Execution
id: 94e12f41-6cb3-45c5-97b1-c783a7bf2e72
status: experimental
description: |
    Detects potential command execution via webshell in SAP NetViewer through JSP files with cmd parameter.
    This rule is created to detect exploitation of vulnerabilities like CVE-2025-31324, which allows remote code execution via a webshell.
references:
    - https://blog.eclecticiq.com/china-nexus-nation-state-actors-exploit-sap-netweaver-cve-2025-31324-to-target-critical-infrastructures
author: Swachchhanda Shrawan Poudel (Nextron Systems)
date: 2025-05-14
tags:
    - attack.persistence
    - attack.t1505.003
    - attack.initial-access
    - attack.t1190
    - detection.emerging-threats
    - cve.2025-31324
logsource:
    category: webserver
detection:
    selection_uri:
        cs-uri-stem|contains|all:
            - '/irj/'
            - '.jsp'
    selection_query:
        - cs-uri-query|startswith:
              - 'cmd='
              - 'command='
              - 'exec_cmd='
              - 'exec='
        - cs-uri-query|contains:
              - '/dev/tcp'
              - '/etc/passwd'
              - '%2fdev%2ftcp' # URL encoded of /dev/tcp
              - '%2fetc%2fpasswd' # URL encoded of /etc/passwd
              - '=uname'
              - '=whoami'
              - 'ifconfig'
              - 'ping'
              - 'pwd'
        - cs-uri-query|contains|all:
              - 'echo'
              - 'base64'
    condition: all of selection_*
falsepositives:
    - Legitimate applications using cmd parameter for non-malicious purposes
level: high