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https://github.com/splunk/security_content
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Eric
68 lines
3.1 KiB
YAML
68 lines
3.1 KiB
YAML
name: Windows Executable in Loaded Modules
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id: 3e27af56-fcf0-4113-988d-24969b062be7
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version: 6
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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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data_source:
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- Sysmon EventID 7
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description: The following analytic identifies instances where executable files (.exe)
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are loaded as modules, detected through 'ImageLoaded' events in Sysmon logs. This
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method leverages Sysmon EventCode 7 to track unusual module loading behavior, which
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is significant as it deviates from the norm of loading .dll files. This activity
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is crucial for SOC monitoring because it can indicate the presence of malware like
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NjRAT, which uses this technique to load malicious modules. If confirmed malicious,
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this behavior could allow attackers to execute arbitrary code, maintain persistence,
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and further compromise the host system.
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search: '`sysmon` EventCode=7 ImageLoaded= *.exe | fillnull | stats count min(_time)
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as firstTime max(_time) as lastTime by Image ImageLoaded dest loaded_file loaded_file_path
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original_file_name process_exec process_guid process_hash process_id process_name
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process_path service_dll_signature_exists service_dll_signature_verified signature
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signature_id user_id vendor_product | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| `windows_executable_in_loaded_modules_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 and imageloaded executions from your endpoints. If you
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are using Sysmon, you must have at least version 6.0.4 of the Sysmon TA.
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known_false_positives: unknown.
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references:
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- https://malpedia.caad.fkie.fraunhofer.de/details/win.njrat
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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: An executable $ImageLoaded$ loaded by $Image$ 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: 64
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threat_objects: []
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tags:
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analytic_story:
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- NjRAT
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asset_type: Endpoint
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mitre_attack_id:
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- T1129
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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/T1129/executable_shared_modules/image_loaded_exe.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: XmlWinEventLog
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