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tccontre
79 lines
2.8 KiB
YAML
79 lines
2.8 KiB
YAML
name: Vbscript Execution Using Wscript App
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id: 35159940-228f-11ec-8a49-acde48001122
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version: 1
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date: '2021-10-01'
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author: Teoderick Contreras, Splunk
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type: TTP
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datamodel:
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- Endpoint
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description: This analytic is to detect a suspicious wscript commandline to execute
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vbscript. This technique was seen in several malware to execute malicious vbs file
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using wscript application. commonly vbs script is associated to cscript process
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and this can be a technique to evade process parent child detections or even some
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av script emulation system.
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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.parent_process_name
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Processes.parent_process Processes.process_name Processes.process_id Processes.process
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Processes.dest Processes.user | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `vbscript_execution_using_wscript_app_filter`'
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how_to_implement: To successfully implement this search you need to be ingesting information
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on process that include the name of the process responsible for the changes from
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your endpoints into the `Endpoint` datamodel in the `Processes` node. In addition,
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confirm the latest CIM App 4.20 or higher is installed and the latest TA for the
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endpoint product.
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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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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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confidence: 70
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context:
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- Source:Endpoint
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- Stage:Execution
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1059.005/vbs_wscript/sysmon.log
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impact: 70
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kill_chain_phases:
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- Exploitation
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message: Process name $process_name$ with commandline $process$ to execute vbsscript
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mitre_attack_id:
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- T1059.005
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- T1059
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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.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: 49
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security_domain: endpoint
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supported_tas:
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- Splunk_TA_microsoft_sysmon
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asset_type: Endpoint
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