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Eric
86 lines
4.3 KiB
YAML
86 lines
4.3 KiB
YAML
name: Vbscript Execution Using Wscript App
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id: 35159940-228f-11ec-8a49-acde48001122
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version: 8
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date: '2025-05-02'
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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: The following analytic detects the execution of VBScript using the wscript.exe
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application. It leverages data from Endpoint Detection and Response (EDR) agents,
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focusing on process and command-line telemetry. This activity is significant because
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wscript.exe is typically not used to execute VBScript, which is usually associated
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with cscript.exe. This deviation can indicate an attempt to evade traditional process
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monitoring and antivirus defenses. If confirmed malicious, this technique could
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allow attackers to execute arbitrary code, potentially leading to system compromise,
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data exfiltration, or further lateral movement within the network.
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data_source:
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- Sysmon EventID 1
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- CrowdStrike ProcessRollup2
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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
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= "wscript.exe" AND Processes.parent_process = "*//e:vbscript*") OR (Processes.process_name
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= "wscript.exe" AND Processes.process = "*//e:vbscript*") by Processes.action Processes.dest
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Processes.original_file_name Processes.parent_process Processes.parent_process_exec
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Processes.parent_process_guid Processes.parent_process_id Processes.parent_process_name
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Processes.parent_process_path Processes.process Processes.process_exec Processes.process_guid
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Processes.process_hash Processes.process_id Processes.process_integrity_level Processes.process_name
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Processes.process_path Processes.user Processes.user_id Processes.vendor_product
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| `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| `vbscript_execution_using_wscript_app_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: unknown
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references:
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- https://www.joesandbox.com/analysis/369332/0/html
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- https://malpedia.caad.fkie.fraunhofer.de/details/win.asyncrat
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drilldown_searches:
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- name: View the detection results for - "$dest$" and "$user$"
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search: '%original_detection_search% | search dest = "$dest$" user = "$user$"'
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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 - "$dest$" and "$user$"
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search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest$",
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"$user$") starthoursago=168 | stats count min(_time) as firstTime max(_time)
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as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk
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Message" values(analyticstories) as "Analytic Stories" values(annotations._all)
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as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics"
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by normalized_risk_object | `security_content_ctime(firstTime)` | `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: Process name $process_name$ with commandline $process$ to execute vbsscript
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risk_objects:
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- field: dest
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type: system
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score: 49
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- field: user
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type: user
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score: 49
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threat_objects: []
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tags:
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analytic_story:
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- FIN7
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- Remcos
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- AsyncRAT
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asset_type: Endpoint
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mitre_attack_id:
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- T1059.005
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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/T1059.005/vbs_wscript/sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: XmlWinEventLog
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