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https://github.com/splunk/security_content
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d1vious
78 lines
3.1 KiB
YAML
78 lines
3.1 KiB
YAML
name: Linux Java Spawning Shell
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id: 7b09db8a-5c20-11ec-9945-acde48001122
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version: 1
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date: '2021-12-13'
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author: Michael Haag, Splunk
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type: TTP
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datamodel:
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- Endpoint
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description: The following analytic identifies the process name of Java, Apache, or Tomcat spawning a Linux shell. This is potentially indicative of exploitation of the Java application and may be related to current event CVE-2021-44228 (Log4Shell).
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The shells included in the macro are "sh", "ksh", "zsh", "bash", "dash", "rbash", "fish", "csh', "tcsh', "ion", "eshell".
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Upon triage, review parallel processes and command-line arguments to determine legitimacy.
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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 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
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| `drop_dm_object_name(Processes)`
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| `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`
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| `linux_java_spawning_shell_filter`'
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how_to_implement: To successfully implement this search, you need to be ingesting
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logs with the process name, parent process, and command-line executions from your
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endpoints. If you are using Sysmon for Linux, you will need to ensure mapping is occurring correctly.
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Ensure EDR product is mapping OS Linux to the datamodel properly.
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Add any additional java process names for your environment to the analytic as needed.
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known_false_positives: Filtering may be required on internal developer build systems or classify assets as web facing and restrict the analytic based on that.
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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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tags:
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analytic_story:
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- Log4Shell CVE-2021-44228
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dataset: []
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kill_chain_phases:
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- Exploitation
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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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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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security_domain: endpoint
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impact: 80
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confidence: 50
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# (impact * confidence)/100
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risk_score: 40
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context:
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- Source:Endpoint
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- Stage:Defense Evasion
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message: An instance of $parent_process_name$ spawning $process_name$ was identified on endpoint $dest$ spawning a Linux shell, potentially indicative of exploitation.
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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: Parent 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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cve:
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- CVE-2021-44228
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