name: Web Spring4Shell HTTP Request Class Module
id: fcdfd69d-0ca3-4476-920e-9b633cb4593e
version: 1
date: '2022-04-06'
author: Michael Haag, Splunk
status: production
type: TTP
description: The following analytic identifies the payload related to Spring4Shell,
  CVE-2022-22965. This analytic uses Splunk Stream HTTP to view the http request body,
  form data. STRT reviewed all the current proof of concept code and determined the
  commonality with the payloads being passed used the same fields "class.module.classLoader.resources.context.parent.pipeline.first".
data_source: []
search: '`stream_http` http_method IN ("POST") | stats values(form_data) as http_request_body
  min(_time) as firstTime max(_time) as lastTime count by src dest http_method http_user_agent
  uri_path url bytes_in bytes_out | search http_request_body IN ("*class.module.classLoader.resources.context.parent.pipeline.first.fileDateFormat=_*",
  "*class.module.classLoader.resources.context.parent.pipeline.first.pattern*","*suffix=.jsp*")
  | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `web_spring4shell_http_request_class_module_filter`'
how_to_implement: To successfully implement this search, you need to be ingesting
  logs with the stream HTTP logs or network logs that catch network traffic. Make
  sure that the http-request-body, payload, or request field is enabled.
known_false_positives: False positives may occur and filtering may be required. Restrict
  analytic to asset type.
references:
- https://github.com/DDuarte/springshell-rce-poc/blob/master/poc.py
tags:
  analytic_story:
  - Spring4Shell CVE-2022-22965
  asset_type: Web Server
  confidence: 80
  cve:
  - CVE-2022-22965
  impact: 90
  message: A http body request related to Spring4Shell has been sent to $dest$ by
    $src$.
  mitre_attack_id:
  - T1190
  - T1133
  observable:
  - name: dest
    type: Hostname
    role:
    - Victim
  - name: src
    type: IP Address
    role:
    - Attacker
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  required_fields:
  - _time
  - http_request_body
  - http_method
  - http_user_agent
  - uri_path
  - url
  - bytes_in
  - bytes_out
  risk_score: 72
  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/http_request_body_streams.log
    source: stream:http
    sourcetype: stream:http