mirror of
https://github.com/splunk/security_content
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Bhavin Patel
66 lines
2.6 KiB
YAML
66 lines
2.6 KiB
YAML
name: Windows Executable in Loaded Modules
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id: 3e27af56-fcf0-4113-988d-24969b062be7
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version: 1
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date: '2023-09-12'
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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 Event ID 7
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description: This analytic identifies potentially malicious 'ImageLoaded' events, particularly when they involve executable files.
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This behavior was observed in NjRAT instances, where, during each instance of loading a module from its C2 server onto the compromised host,
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Sysmon recorded the path of the actual Image or Process as an 'ImageLoaded' event, rather than the typical tracking of dynamically loaded DLL modules in memory.
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This event holds significance because it tracks processes that load modules and libraries, which are typically in the .dll format rather than .exe.
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Leveraging this 'Time-To-Perform' (TTP) detection method can prove invaluable for the identification of NjRAT malware or
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other malicious software instances that introduce executable files as modules within a targeted host.
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search: '`sysmon` EventCode=7 ImageLoaded= *.exe
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| stats count min(_time) as firstTime max(_time) as lastTime by Image ImageLoaded Signed SignatureStatus OriginalFileName process_name Computer EventCode ProcessId Hashes IMPHASH
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| rename Computer as dest
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| `security_content_ctime(firstTime)`
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| `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 logs with the process name and imageloaded executions from your endpoints.
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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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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
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