Webserver JNDI-Exploit-Kit Exploitation Indicators via Known Payload Paths

Flags webserver requests whose URL paths match known JNDI-Exploit-Kit exploit, deserialization, and memshell pattern strings.

FreeReviewedSigma · High · v2

Category: webserver
Author: Florian Roth (Nextron Systems) (SigmaHQ), DRL 1.1
Published: 2021-12-12
Updated: 2026-07-31

Analysis Detection

ATT&CK techniques

Initial Access

Recon
Resource Dev
Initial Access
- T1190Exploit Public-Facing Application
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule identifies web exploitation attempts using patterns associated with the JNDI-Exploit-Kit by matching specific URL or path substrings in webserver logs. Attackers often use these payload paths to trigger JNDI-related behavior and deploy or execute follow-on functionality such as reverse shells or memshells. The detection relies on keyword/path telemetry from webserver requests containing the listed signature fragments.

Reporting behind it

Related detections9 linkedT1190 — drag to rearrange

Cleo Autorun Exploitation via Healthcheck File Drop

Suspicious SharePoint Worker Process Spawning Command Interpreter via ToolShell

Malicious IIS Worker Process Spawning Command Shell Reconnaissance

Potential StyleSmuggler (CVE-2026-75650) Exploitation Attempt - Magento GraphQL Styles Parameter (via webserver)

Cisco IOS XE Configuration Change by Web UI WSMA User

Possible React2Shell CVE-2025-55182 Prototype Pollution Exploitation

Possible Next.js Middleware Auth Bypass via X-Middleware-Subrequest Header (CVE-2025-29927)

Possible Ivanti Pulse Connect Secure Command Injection via License Keys-Status Endpoint (via webserver)

Possible Ivanti Pulse Connect Secure Auth Bypass via TOTP Backup Code Path Traversal (via webserver)

Webserver JNDI-Exploit-Kit Exploitation Indicators via Known Payload Paths

Pivot detection · T1190 · 9 related

Changelog

v2
Candidate ingested via manual entry.2026-07-31
v1
No changelog recorded for this version.2026-07-30

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

webserver-detection-for-jndi-exploit-kit-exploit-and-memshell-url-path-patterns-412d55bc

title: Webserver JNDI-Exploit-Kit Exploitation Indicators via Known Payload Paths
id: 97820797-75af-4402-8184-26c59514e2b0
status: test
description: This rule identifies web exploitation attempts using patterns associated with the JNDI-Exploit-Kit by matching specific URL or path substrings in webserver logs. Attackers often use these payload paths to trigger JNDI-related behavior and deploy or execute follow-on functionality such as reverse shells or memshells. The detection relies on keyword/path telemetry from webserver requests containing the listed signature fragments.
references:
  - https://github.com/pimps/JNDI-Exploit-Kit
  - https://web.archive.org/web/20231015205935/https://githubmemory.com/repo/FunctFan/JNDIExploit
  - https://github.com/SigmaHQ/sigma/blob/master/rules/web/webserver_generic/web_jndi_exploit.yml
author: Florian Roth (Nextron Systems), Huntrule Team
date: 2021-12-12
modified: 2022-12-25
tags:
  - attack.initial-access
  - attack.t1190
logsource:
  category: webserver
detection:
  keywords:
    - /Basic/Command/Base64/
    - /Basic/ReverseShell/
    - /Basic/TomcatMemshell
    - /Basic/JettyMemshell
    - /Basic/WeblogicMemshell
    - /Basic/JBossMemshell
    - /Basic/WebsphereMemshell
    - /Basic/SpringMemshell
    - /Deserialization/URLDNS/
    - /Deserialization/CommonsCollections1/Dnslog/
    - /Deserialization/CommonsCollections2/Command/Base64/
    - /Deserialization/CommonsBeanutils1/ReverseShell/
    - /Deserialization/Jre8u20/TomcatMemshell
    - /TomcatBypass/Dnslog/
    - /TomcatBypass/Command/
    - /TomcatBypass/ReverseShell/
    - /TomcatBypass/TomcatMemshell
    - /TomcatBypass/SpringMemshell
    - /GroovyBypass/Command/
    - /WebsphereBypass/Upload/
  condition: keywords
falsepositives:
  - Legitimate apps the use these paths
level: high
license: DRL-1.1
related:
  - id: 412d55bc-7737-4d25-9542-5b396867ce55
    type: derived

Convert

This rule as a query you can run. Uses no unlock credit.

SplunkSPL