Sigma rule: Potential Java WebShell Upload in SAP NetViewer Server

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-449e6202c90e, updated 2025-05-14T00:00:00.000Z.

Rule

Title
Potential Java WebShell Upload in SAP NetViewer Server
Status
experimental
Level
high
Author
Swachchhanda Shrawan Poudel (Nextron Systems)
Date
2025-05-14
File
rules-emerging-threats/2025/Exploits/CVE-2025-31324/web_lnx_exploit_cve_2025_31324_sap_netviewer_webshell_uploaded.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects potential Java webshell uploads via HTTP requests with Content-Type 'application/octet-stream' and Java file extensions.
This behavior might indicate exploitation of vulnerabilities like CVE-2025-31324, which allows remote code execution through webshells in SAP NetViewer.

Log source

category
webserver

Detection

selection:
    cs-content-type: 'application/octet-stream'
    cs-method: 'POST'
    cs-uri-stem|contains|all:
        - '/irj/'
        - '.jsp'
    cs-uri-stem|endswith:
        - '.class'
        - '.java'
        - '.jsp'
condition: selection

False positives (as the rule lists them)

  • Legitimate uploads of Java files in development environments

Tags

  • attack.persistence
  • attack.t1505.003
  • detection.emerging-threats
  • cve.2025-31324

CVEs this rule names

MITRE ATT&CK ids this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2025/Exploits/CVE-2025-31324/web_lnx_exploit_cve_2025_31324_sap_netviewer_webshell_uploaded.yml

Sources and licences

  • SigmaHQ

    "Potential Java WebShell Upload in SAP NetViewer Server" by Swachchhanda Shrawan Poudel (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2025/Exploits/CVE-2025-31324/web_lnx_exploit_cve_2025_31324_sap_netviewer_webshell_uploaded.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Potential Java WebShell Upload in SAP NetViewer Server",
entity page, dataset version ref-449e6202c90e, updated 2025-05-14T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/639b893f-f93a-4e53-a7c8-f08cf73fe7f7 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 639b893f-f93a-4e53-a7c8-f08cf73fe7f7, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.