spring4shell_payload_url_request.yml

name: Spring4Shell Payload URL Request
id: 9d44d649-7d67-4559-95c1-8022ff49420b
version: 5
date: '2025-02-10'
author: Michael Haag, Splunk
status: production
type: TTP
description: The following analytic detects attempts to exploit the Spring4Shell vulnerability
  (CVE-2022-22963) by identifying specific URL patterns associated with web shell
  payloads. It leverages web traffic data, focusing on HTTP GET requests with URLs
  containing indicators like "tomcatwar.jsp," "poc.jsp," and "shell.jsp." This activity
  is significant as it suggests an attacker is trying to deploy a web shell, which
  can lead to remote code execution. If confirmed malicious, this could allow the
  attacker to gain persistent access, execute arbitrary commands, and potentially
  escalate privileges within the compromised environment.
data_source:
- Nginx Access
search: '| tstats count from datamodel=Web where Web.http_method IN ("GET") Web.url
  IN ("*tomcatwar.jsp*","*poc.jsp*","*shell.jsp*") by Web.http_user_agent Web.http_method,
  Web.url,Web.url_length Web.src, Web.dest sourcetype | `drop_dm_object_name("Web")`
  | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `spring4shell_payload_url_request_filter`'
how_to_implement: To successfully implement this search you need to be ingesting information
  on Web traffic that include fields relavent for traffic into the `Web` datamodel.
known_false_positives: The jsp file names are static names used in current proof of
  concept code. =
references:
- https://www.microsoft.com/security/blog/2022/04/04/springshell-rce-vulnerability-guidance-for-protecting-against-and-detecting-cve-2022-22965/
- https://github.com/TheGejr/SpringShell
- https://www.tenable.com/blog/spring4shell-faq-spring-framework-remote-code-execution-vulnerability
drilldown_searches:
- name: View the detection results for - "$dest$"
  search: '%original_detection_search% | search  dest = "$dest$"'
  earliest_offset: $info_min_time$
  latest_offset: $info_max_time$
- name: View risk events for the last 7 days for - "$dest$"
  search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest$")
    starthoursago=168  | stats count min(_time) as firstTime max(_time) as lastTime
    values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories)
    as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic)
    as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)`
    | `security_content_ctime(lastTime)`'
  earliest_offset: $info_min_time$
  latest_offset: $info_max_time$
rba:
  message: A URL was requested related to Spring4Shell POC code on $dest$ by $src$.
  risk_objects:
  - field: dest
    type: system
    score: 36
  threat_objects:
  - field: src
    type: ip_address
tags:
  analytic_story:
  - Spring4Shell CVE-2022-22965
  asset_type: Web Server
  cve:
  - CVE-2022-22965
  mitre_attack_id:
  - T1133
  - T1190
  - T1505.003
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  security_domain: network
tests:
- name: True Positive Test
  attack_data:
  - data: 
      https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1190/spring4shell/spring4shell_nginx.log
    source: /var/log/nginx/access.log
    sourcetype: nginx:plus:kv