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https://github.com/splunk/security_content
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Eric
80 lines
4.0 KiB
YAML
80 lines
4.0 KiB
YAML
name: Loading Of Dynwrapx Module
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id: eac5e8ba-4857-11ec-9371-acde48001122
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version: 7
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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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description: The following analytic detects the loading of the dynwrapx.dll module,
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which is associated with the DynamicWrapperX ActiveX component. This detection leverages
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Sysmon EventCode 7 to identify processes that load or register dynwrapx.dll. This
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activity is significant because DynamicWrapperX can be used to call Windows API
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functions in scripts, making it a potential tool for malicious actions. If confirmed
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malicious, this could allow an attacker to execute arbitrary code, escalate privileges,
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or maintain persistence on the host. Immediate investigation of parallel processes
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and registry modifications is recommended.
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data_source:
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- Sysmon EventID 7
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search: '`sysmon` EventCode=7 (ImageLoaded = "*\\dynwrapx.dll" OR OriginalFileName
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= "dynwrapx.dll" OR Product = "DynamicWrapperX") | 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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| `loading_of_dynwrapx_module_filter`'
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how_to_implement: To successfully implement this search you need to be ingesting information
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on processes 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` and `Filesystem`
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node. In addition, confirm the latest CIM App 4.20 or higher is installed and the
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latest TA for the endpoint product.
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known_false_positives: False positives should be limited, however it is possible to
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filter by Processes.process_name and specific processes (ex. wscript.exe). Filter
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as needed. This may need modification based on EDR telemetry and how it brings in
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registry data. For example, removal of (Default).
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references:
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- https://blog.f-secure.com/hunting-for-koadic-a-com-based-rootkit/
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- https://www.script-coding.com/dynwrapx_eng.html
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- https://bohops.com/2018/06/28/abusing-com-registry-structure-clsid-localserver32-inprocserver32/
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- https://tria.ge/210929-ap75vsddan
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- https://www.virustotal.com/gui/file/cb77b93150cb0f7fe65ce8a7e2a5781e727419451355a7736db84109fa215a89
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- https://malpedia.caad.fkie.fraunhofer.de/details/win.asyncrat
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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: dynwrapx.dll loaded by process $process_name$ 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: 80
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threat_objects: []
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tags:
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analytic_story:
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- Remcos
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- AsyncRAT
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asset_type: Endpoint
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mitre_attack_id:
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- T1055.001
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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/malware/remcos/remcos_dynwrapx/sysmon_dynwraper.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: XmlWinEventLog
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