mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Eric McGinnis
63 lines
3.5 KiB
YAML
63 lines
3.5 KiB
YAML
name: Web Remote ShellServlet Access
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id: c2a332c3-24a2-4e24-9455-0e80332e6746
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version: 11
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creation_date: '2023-12-06'
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modification_date: '2026-05-13'
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author: Michael Haag, Splunk
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status: production
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type: TTP
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description: The following analytic identifies attempts to access the Remote ShellServlet on a web server, specifically targeting Confluence servers vulnerable to CVE-2023-22518 and CVE-2023-22515. It leverages web data to detect URLs containing "*plugins/servlet/com.jsos.shell/*" with a status code of 200. This activity is significant as it is commonly associated with web shells and other malicious behaviors, potentially leading to unauthorized command execution. If confirmed malicious, attackers could gain remote code execution capabilities, compromising the server and potentially the entire network.
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data_source:
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- Nginx Access
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search: |-
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| tstats count min(_time) as firstTime max(_time) as lastTime FROM datamodel=Web
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WHERE Web.url IN ("*plugins/servlet/com.jsos.shell/*") Web.status=200
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BY Web.http_user_agent, Web.status Web.http_method,
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Web.url, Web.url_length, Web.src,
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Web.dest, sourcetype
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| `drop_dm_object_name("Web")`
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| `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`
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| `web_remote_shellservlet_access_filter`
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how_to_implement: This analytic necessitates the collection of web data, which can be achieved through Splunk Stream or by utilizing the Splunk Add-on for Apache Web Server. No additional configuration is required for this analytic.
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known_false_positives: False positives may occur depending on the web server's configuration. If the web server is intentionally configured to utilize the Remote ShellServlet, then the detections by this analytic would not be considered true positives.
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references:
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- http://www.servletsuite.com/servlets/shell.htm
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drilldown_searches:
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- name: View the detection results for - "$dest$"
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search: '%original_detection_search% | search dest = "$dest$"'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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- name: View risk events for the last 7 days for - "$dest$"
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search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest$") | 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)`'
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earliest_offset: 7d
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latest_offset: "0"
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finding:
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title: An attempt to access the Remote ShellServlet on a web server was detected. The source IP is $src$ and the destination hostname is $dest$.
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entity:
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field: dest
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type: system
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score: 50
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threat_objects:
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- field: src
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type: ip_address
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analytic_story:
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- CVE-2023-22515 Privilege Escalation Vulnerability Confluence Data Center and Server
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- GhostRedirector IIS Module and Rungan Backdoor
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asset_type: Web Server
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mitre_attack_id:
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- T1190
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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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category: web
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security_domain: network
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tests:
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- name: True Positive Test
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attack_data:
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- data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1190/confluence/nginx_shellservlet.log
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source: /var/log/nginx/access.log
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sourcetype: nginx:plus:kv
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test_type: unit
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