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64 lines
3.2 KiB
YAML
64 lines
3.2 KiB
YAML
name: Windows Executable in Loaded Modules
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id: 3e27af56-fcf0-4113-988d-24969b062be7
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version: 3
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date: '2024-09-30'
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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) are loaded as modules, detected through 'ImageLoaded' events in Sysmon logs. This method leverages Sysmon EventCode 7 to track unusual module loading behavior, which is significant as it deviates from the norm of loading .dll files. This activity is crucial for SOC monitoring because it can indicate the presence of malware like NjRAT, which uses this technique to load malicious modules. If confirmed malicious, this behavior could allow attackers to execute arbitrary code, maintain persistence, and further compromise the host system.
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search: '`sysmon` EventCode=7 ImageLoaded= *.exe | stats count min(_time) as firstTime max(_time) as lastTime by Image ImageLoaded Signed SignatureStatus OriginalFileName process_name Computer EventCode ProcessId Hashes IMPHASH | rename Computer as dest | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `windows_executable_in_loaded_modules_filter`'
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how_to_implement: To successfully implement this search, you need to be ingesting logs with the process name and imageloaded executions from your endpoints. If you 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 ("$dest$") starthoursago=168 | stats count min(_time) as firstTime max(_time) as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories) as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics" 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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tags:
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analytic_story:
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- NjRAT
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asset_type: Endpoint
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confidence: 80
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impact: 80
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message: An executable $ImageLoaded$ loaded by $Image$ on $dest$
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mitre_attack_id:
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- T1129
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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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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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risk_score: 64
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required_fields:
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- _time
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- Image
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- ImageLoaded
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- Signed
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- SignatureStatus
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- OriginalFileName
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- process_name
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- Computer
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- EventCode
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- ProcessId
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- Hashes
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- IMPHASH
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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:Microsoft-Windows-Sysmon/Operational
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