mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Eric McGinnis
88 lines
5.1 KiB
YAML
88 lines
5.1 KiB
YAML
name: Java Writing JSP File
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id: eb65619c-4f8d-4383-a975-d352765d344b
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version: 13
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creation_date: '2022-04-05'
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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 detects the Java process writing a .jsp file to disk, which may indicate a web shell being deployed. It leverages data from the Endpoint datamodel, specifically monitoring process and filesystem activities. This activity is significant because web shells can provide attackers with remote control over the compromised server, leading to further exploitation. If confirmed malicious, this could allow unauthorized access, data exfiltration, or further compromise of the affected system, posing a severe security risk.
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data_source:
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- Sysmon for Linux EventID 1 AND Sysmon for Linux EventID 11
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search: |-
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| tstats `security_content_summariesonly` count FROM datamodel=Endpoint.Processes
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WHERE Processes.process_name IN ("java","java.exe", "javaw.exe")
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BY _time Processes.action Processes.dest
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Processes.original_file_name Processes.parent_process Processes.parent_process_exec
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Processes.parent_process_guid Processes.parent_process_id Processes.parent_process_name
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Processes.parent_process_path Processes.process Processes.process_exec
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Processes.process_guid Processes.process_hash Processes.process_id
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Processes.process_integrity_level Processes.process_name Processes.process_path
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Processes.user Processes.user_id Processes.vendor_product
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| `drop_dm_object_name(Processes)`
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| join process_guid [
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| tstats `security_content_summariesonly` count FROM datamodel=Endpoint.Filesystem
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WHERE Filesystem.file_name="*.jsp*"
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BY _time Filesystem.action Filesystem.dest
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Filesystem.file_access_time Filesystem.file_create_time Filesystem.file_hash
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Filesystem.file_modify_time Filesystem.file_name Filesystem.file_path
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Filesystem.file_acl Filesystem.file_size Filesystem.process_guid
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Filesystem.process_id Filesystem.user Filesystem.vendor_product
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| `drop_dm_object_name(Filesystem)`
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| fields _time process_guid file_path file_name file_create_time user dest process_name]
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| stats count min(_time) as firstTime max(_time) as lastTime
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BY dest process_name process_guid
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file_name file_path file_create_time
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user
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| `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`
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| `java_writing_jsp_file_filter`
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how_to_implement: To successfully implement this search you need to be ingesting information on process that include the name of the process responsible for the changes from your endpoints into the `Endpoint` datamodel in the `Processes` and `Filesystem` node. In addition, confirm the latest CIM App 4.20 or higher is installed and the latest TA for the endpoint product.
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known_false_positives: False positives are possible and filtering may be required. Restrict by assets or filter known jsp files that are common for the environment.
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references:
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- https://www.microsoft.com/security/blog/2022/04/04/springshell-rce-vulnerability-guidance-for-protecting-against-and-detecting-cve-2022-22965/
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- https://github.com/TheGejr/SpringShell
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- https://www.tenable.com/blog/spring4shell-faq-spring-framework-remote-code-execution-vulnerability
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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 instance of $process_name$ was identified on endpoint $dest$ writing a jsp file $file_name$ to disk, potentially indicative of exploitation.
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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: process_name
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type: process_name
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analytic_story:
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- Spring4Shell CVE-2022-22965
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- Atlassian Confluence Server and Data Center CVE-2022-26134
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- SysAid On-Prem Software CVE-2023-47246 Vulnerability
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- SAP NetWeaver Exploitation
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asset_type: Endpoint
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cve:
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- CVE-2022-22965
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mitre_attack_id:
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- T1190
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- T1133
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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: endpoint
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security_domain: endpoint
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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/spring4shell/java_write_jsp-linux-sysmon.log
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source: Syslog:Linux-Sysmon/Operational
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sourcetype: sysmon:linux
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test_type: unit
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