mirror of
https://github.com/splunk/security_content
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Bhavin Patel
76 lines
3.2 KiB
YAML
76 lines
3.2 KiB
YAML
name: MSBuild Suspicious Spawned By Script Process
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id: 213b3148-24ea-11ec-93a2-acde48001122
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version: 1
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date: '2021-10-04'
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author: Teoderick Contreras, Splunk
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status: production
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type: TTP
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description: This analytic is to detect a suspicious child process of MSBuild spawned
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by Windows Script Host - cscript or wscript. This behavior or event are commonly
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seen and used by malware or adversaries to execute malicious msbuild process using
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malicious script in the compromised host. During triage, review parallel processes
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and identify any file modifications. MSBuild may load a script from the same path
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without having command-line arguments.
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data_source:
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- Sysmon Event ID 1
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search: '| tstats `security_content_summariesonly` count values(Processes.process_name)
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as process_name values(Processes.process) as process min(_time) as firstTime max(_time)
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as lastTime from datamodel=Endpoint.Processes where Processes.parent_process_name
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IN ("wscript.exe", "cscript.exe") AND `process_msbuild` by Processes.dest Processes.parent_process
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Processes.parent_process_name Processes.process_name Processes.original_file_name
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Processes.user | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `msbuild_suspicious_spawned_by_script_process_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: False positives should be limited as developers do not spawn
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MSBuild via a WSH.
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references:
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- https://app.any.run/tasks/dc93ee63-050c-4ff8-b07e-8277af9ab939/
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tags:
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analytic_story:
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- Trusted Developer Utilities Proxy Execution MSBuild
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asset_type: Endpoint
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confidence: 70
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impact: 70
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message: Msbuild.exe process spawned by $parent_process_name$ on $dest$ executed
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by $user$
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mitre_attack_id:
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- T1127.001
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- T1127
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observable:
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- name: dest
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type: Endpoint
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role:
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- Victim
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- name: user
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type: User
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role:
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- Victim
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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.parent_process
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- Processes.parent_process_name
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- Processes.process_name
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- Processes.original_file_name
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- Processes.user
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risk_score: 49
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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/T1127.001/regsvr32_silent/sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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