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pyth0n1c
72 lines
3.3 KiB
YAML
72 lines
3.3 KiB
YAML
name: MS Scripting Process Loading WMI Module
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id: 2eba3d36-14a6-11ec-a682-acde48001122
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version: 5
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date: '2025-02-10'
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author: Teoderick Contreras, Splunk
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status: production
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type: Anomaly
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description: The following analytic detects the loading of WMI modules by Microsoft
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scripting processes like wscript.exe or cscript.exe. It leverages Sysmon EventCode
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7 to identify instances where these scripting engines load specific WMI-related
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DLLs. This activity is significant because it can indicate the presence of malware,
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such as the FIN7 implant, which uses JavaScript to execute WMI queries for gathering
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host information to send to a C2 server. If confirmed malicious, this behavior could
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allow attackers to collect sensitive system information and maintain persistence
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within the environment.
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data_source:
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- Sysmon EventID 7
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search: '`sysmon` EventCode =7 Image IN ("*\\wscript.exe", "*\\cscript.exe") ImageLoaded
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IN ("*\\fastprox.dll", "*\\wbemdisp.dll", "*\\wbemprox.dll", "*\\wbemsvc.dll" ,
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"*\\wmiutils.dll", "*\\wbemcomn.dll") | stats min(_time) as firstTime max(_time)
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as lastTime count by Image EventCode process_name ProcessId ProcessGuid Computer
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ImageLoaded | rename Computer as dest | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| `ms_scripting_process_loading_wmi_module_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, you must have at least version 6.0.4 of the
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Sysmon TA. Tune and filter known instances where renamed rundll32.exe may be used.
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known_false_positives: automation scripting language may used by network operator
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to do ldap query.
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references:
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- https://www.mandiant.com/resources/fin7-pursuing-an-enigmatic-and-evasive-global-criminal-operation
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- https://attack.mitre.org/groups/G0046/
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drilldown_searches:
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- name: View the detection results for - "$dest$"
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search: '%original_detection_search% | search dest = "$dest$"'
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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 - "$dest$"
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search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest$")
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starthoursago=168 | stats count min(_time) as firstTime max(_time) as lastTime
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values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories)
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as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic)
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as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)`
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| `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: $process_name$ loading wmi modules $ImageLoaded$ on $dest$
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risk_objects:
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- field: dest
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type: system
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score: 9
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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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asset_type: Endpoint
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mitre_attack_id:
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- T1059.007
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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:
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https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/fin7/fin7_js_2/sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: XmlWinEventLog
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