mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Bhavin Patel
61 lines
2.6 KiB
YAML
61 lines
2.6 KiB
YAML
name: Web Remote ShellServlet Access
|
|
id: c2a332c3-24a2-4e24-9455-0e80332e6746
|
|
version: 1
|
|
date: '2023-11-22'
|
|
author: Michael Haag, Splunk
|
|
status: production
|
|
type: TTP
|
|
data_source:
|
|
- UPDATE_DATA_SOURCE
|
|
description: The following analytic identifies an attempt to access the Remote ShellServlet
|
|
on a web server. This servlet is used to execute commands on the server. This activity
|
|
is often associated with web shells and other malicious activity. This activity was identified against a Confluence server related to CVE-2023-22518 and CVE-2023-22515. Activity prior to access to the shell servlet include adding a plugin to Confluence. In addition, monitor for ShellServlet?act=3, ShellServlet or obfuscated variations including Sh3llServlet1.
|
|
search: '| tstats count min(_time) as firstTime max(_time) as lastTime from datamodel=Web where Web.url IN ("*plugins/servlet/com.jsos.shell/*") Web.status=200 by Web.http_user_agent, Web.status 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)` | `web_remote_shellservlet_access_filter`'
|
|
how_to_implement: The following analytic requires collection of Web data. The data can be collected via Splunk Stream, or by using the Splunk Add-on for Apache Web Server. The analytic does not require any additional configuration.
|
|
known_false_positives: False positives may be present based on the web server configuration. If the web server is configured to use the Remote ShellServlet, then this analytic will not be a true positive.
|
|
references:
|
|
- http://www.servletsuite.com/servlets/shell.htm
|
|
tags:
|
|
analytic_story:
|
|
- CVE-2023-22515 Privilege Escalation Vulnerability Confluence Data Center and Server
|
|
asset_type: web server
|
|
atomic_guid: []
|
|
confidence: 90
|
|
impact: 90
|
|
message: An attempt to access the Remote ShellServlet on a web server was detected. The source IP is $src$ and the destination hostname is $dest$.
|
|
mitre_attack_id:
|
|
- T1190
|
|
observable:
|
|
- name: src
|
|
type: IP Address
|
|
role:
|
|
- Attacker
|
|
- name: dest
|
|
type: Hostname
|
|
role:
|
|
- Victim
|
|
product:
|
|
- Splunk Enterprise
|
|
- Splunk Enterprise Security
|
|
- Splunk Cloud
|
|
risk_score: 81
|
|
required_fields:
|
|
- Web.http_user_agent
|
|
- Web.status
|
|
- Web.http_method
|
|
- Web.url
|
|
- Web.url_length
|
|
- Web.src
|
|
- Web.dest
|
|
- sourcetype
|
|
security_domain: network
|
|
tests:
|
|
- name: True Positive Test
|
|
attack_data:
|
|
- data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1190/confluence/shellservlet.log
|
|
source: aws
|
|
sourcetype: aws:cloudfront:accesslogs
|