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https://github.com/splunk/security_content
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Michael Haag
71 lines
2.4 KiB
YAML
71 lines
2.4 KiB
YAML
name: Java Writing JSP File
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id: eb65619c-4f8d-4383-a975-d352765d344b
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version: 2
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date: '2022-06-03'
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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 the process java writing a .jsp to
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disk. This is potentially indicative of a web shell being written to disk. Modify
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and tune the analytic based on data ingested. For instance, it may be worth running
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a broad query for jsp file writes first before performing a join.
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data_source:
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- Sysmon Event ID 1
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search:
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selection1:
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Image|endswith:
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- java
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- java.exe
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- javaw.exe
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condition: selection1
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how_to_implement: To successfully implement this search you need to be ingesting information
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on process that include the name of the process responsible for the changes from
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your endpoints into the `Endpoint` datamodel in the `Processes` and `Filesystem`
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node. In addition, confirm the latest CIM App 4.20 or higher is installed and the
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latest TA for the endpoint product.
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known_false_positives: False positives are possible and filtering may be required.
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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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tags:
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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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asset_type: Endpoint
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confidence: 70
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cve:
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- CVE-2022-22965
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impact: 60
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message: An instance of $process_name$ was identified on endpoint $dest$ writing
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a jsp file to disk, potentially indicative of exploitation.
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mitre_attack_id:
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- T1190
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- T1133
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observable:
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- name: dest
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type: Hostname
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role:
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- Victim
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- name: parent_process_name
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type: Process
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role:
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- Parent Process
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- name: process_name
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type: Process
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role:
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- Child Process
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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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risk_score: 42
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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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