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P4T12ICK
63 lines
2.1 KiB
YAML
63 lines
2.1 KiB
YAML
name: Windows Java Spawning Shells
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id: 28c81306-5c47-11ec-bfea-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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status: experimental
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type: TTP
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description: The following analytic identifies the process name of java.exe and w3wp.exe
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spawning a Windows shell. This is potentially indicative of exploitation of the
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Java application and may be related to current event CVE-2021-44228 (Log4Shell).
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The shells included in the macro are "cmd.exe", "powershell.exe". Upon triage, review
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parallel processes and command-line arguments to determine legitimacy.
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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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ParentImage:
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- java.exe
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- w3wp.exe
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condition: selection1
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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. Restrict the analytic to publicly facing endpoints to reduce false positives.
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Add any additional identified web application process name to the query. Add any
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further Windows process names to the macro (ex. LOLBins) to further expand this
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query.
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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 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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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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message: An instance of $parent_process_name$ spawning $process_name$ was identified
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on endpoint $dest$ spawning a Windows shell, potentially indicative of exploitation.
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mitre_attack_id:
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- T1190
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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: 40
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security_domain: endpoint
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