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https://github.com/splunk/security_content
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ljstella
104 lines
4.6 KiB
YAML
104 lines
4.6 KiB
YAML
name: Linux Java Spawning Shell
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id: 7b09db8a-5c20-11ec-9945-acde48001122
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version: 5
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date: '2024-11-13'
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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 instances where Java, Apache, or Tomcat
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processes spawn a Linux shell, which may indicate exploitation attempts, such as
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those related to CVE-2021-44228 (Log4Shell). This detection leverages Endpoint Detection
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and Response (EDR) telemetry, focusing on process names and parent-child process
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relationships. This activity is significant as it can signify a compromised Java
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application, potentially leading to unauthorized shell access. If confirmed malicious,
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attackers could execute arbitrary commands, escalate privileges, or maintain persistent
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access, posing a severe threat to the environment.
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data_source:
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- Sysmon for Linux EventID 1
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search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
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as lastTime from datamodel=Endpoint.Processes where Processes.parent_process_name=java
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OR Processes.parent_process_name=apache OR Processes.parent_process_name=tomcat
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`linux_shells` by Processes.dest Processes.user Processes.parent_process_name Processes.process_name
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Processes.process Processes.process_id Processes.parent_process_id | `drop_dm_object_name(Processes)`
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| `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `linux_java_spawning_shell_filter`'
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how_to_implement: The detection is based on data that originates from Endpoint Detection
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and Response (EDR) agents. These agents are designed to provide security-related
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telemetry from the endpoints where the agent is installed. To implement this search,
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you must ingest logs that contain the process GUID, process name, and parent process.
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Additionally, you must ingest complete command-line executions. These logs must
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be processed using the appropriate Splunk Technology Add-ons that are specific to
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the EDR product. The logs must also be mapped to the `Processes` node of the `Endpoint`
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data model. Use the Splunk Common Information Model (CIM) to normalize the field
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names and speed up the data modeling process.
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known_false_positives: Filtering may be required on internal developer build systems
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or classify assets as web facing and restrict the analytic based on asset type.
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references:
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- https://blog.netlab.360.com/ten-families-of-malicious-samples-are-spreading-using-the-log4j2-vulnerability-now/
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- https://gist.github.com/olafhartong/916ebc673ba066537740164f7e7e1d72
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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 $parent_process_name$ spawning $process_name$ was identified
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on endpoint $dest$ spawning a Linux shell, potentially indicative of exploitation.
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risk_objects:
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- field: dest
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type: Hostname
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risk_score: 40
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threat_objects:
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- field: parent_process_name
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type: Process
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- field: process_name
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type: Process
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tags:
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analytic_story:
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- Data Destruction
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- Spring4Shell CVE-2022-22965
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- Hermetic Wiper
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- Log4Shell CVE-2021-44228
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asset_type: Endpoint
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confidence: 50
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cve:
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- CVE-2021-44228
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impact: 80
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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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required_fields:
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- _time
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- Processes.dest
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- Processes.user
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- Processes.parent_process_name
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- Processes.parent_process
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- Processes.original_file_name
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- Processes.process_name
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- Processes.process
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- Processes.process_id
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- Processes.parent_process_path
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- Processes.process_path
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- Processes.parent_process_id
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risk_score: 40
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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:
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https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1190/java/java_spawn_shell_nix.log
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source: Syslog:Linux-Sysmon/Operational
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sourcetype: sysmon:linux
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