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https://github.com/splunk/security_content
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Eric
93 lines
4.9 KiB
YAML
93 lines
4.9 KiB
YAML
name: Java Writing JSP File
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id: eb65619c-4f8d-4383-a975-d352765d344b
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version: 9
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date: '2025-05-02'
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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
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disk, which may indicate a web shell being deployed. It leverages data from the
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Endpoint datamodel, specifically monitoring process and filesystem activities. This
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activity is significant because web shells can provide attackers with remote control
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over the compromised server, leading to further exploitation. If confirmed malicious,
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this could allow unauthorized access, data exfiltration, or further compromise of
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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: '| tstats `security_content_summariesonly` count FROM datamodel=Endpoint.Processes
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where Processes.process_name IN ("java","java.exe", "javaw.exe") by _time Processes.action Processes.dest Processes.original_file_name
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Processes.parent_process Processes.parent_process_exec Processes.parent_process_guid
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Processes.parent_process_id Processes.parent_process_name Processes.parent_process_path
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Processes.process Processes.process_exec Processes.process_guid Processes.process_hash
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Processes.process_id 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 [| tstats `security_content_summariesonly` count FROM datamodel=Endpoint.Filesystem
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where Filesystem.file_name="*.jsp*" by _time Filesystem.action Filesystem.dest Filesystem.file_access_time Filesystem.file_create_time
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Filesystem.file_hash Filesystem.file_modify_time Filesystem.file_name Filesystem.file_path
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Filesystem.file_acl Filesystem.file_size Filesystem.process_guid Filesystem.process_id
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Filesystem.user Filesystem.vendor_product
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| `drop_dm_object_name(Filesystem)` | fields _time process_guid file_path file_name
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file_create_time user dest process_name] | stats count min(_time) as firstTime max(_time)
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as lastTime by dest process_name process_guid file_name file_path file_create_time
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user | `security_content_ctime(firstTime)` | `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
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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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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 ("$dest$")
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starthoursago=168 | stats count min(_time) as firstTime max(_time) as lastTime
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values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories)
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as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic)
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as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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rba:
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message: An instance of $process_name$ was identified on endpoint $dest$ writing
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a jsp file $file_name$ to disk, potentially indicative of exploitation.
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risk_objects:
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- field: dest
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type: system
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score: 42
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threat_objects:
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- field: process_name
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type: process_name
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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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- 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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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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