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The malware sunburst will load the malicious dll by SolarWinds.BusinessLayerHost.exe. After a period of 12-14 days, the malware will attempt to resolve a subdomain of avsvmcloud.com. This detections will correlate both events.

  • Type: TTP
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel:
  • Last Updated: 2020-12-14
  • Author: Patrick Bareiss, Splunk
  • ID: 701a8740-e8db-40df-9190-5516d3819787


ID Technique Tactic
T1203 Exploitation for Client Execution Execution
(`sysmon` EventCode=7 ImageLoaded=*SolarWinds.Orion.Core.BusinessLayer.dll) OR (`sysmon` EventCode=22 QueryName=*avsvmcloud.com) 
| eventstats dc(EventCode) AS dc_events 
| where dc_events=2 
| stats min(_time) as firstTime max(_time) as lastTime values(ImageLoaded) AS ImageLoaded values(QueryName) AS QueryName by host 
| rename host as dest 
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)` 
| `sunburst_correlation_dll_and_network_event_filter` 

Associated Analytic Story

How To Implement

This detection relies on sysmon logs with the Event ID 7, Driver loaded. Please tune your sysmon config that you DriverLoad event for SolarWinds.Orion.Core.BusinessLayer.dll is captured by Sysmon. Additionally, you need sysmon logs for Event ID 22, DNS Query. We suggest to run this detection at least once a day over the last 14 days.

Required field

  • _time
  • EventCode
  • ImageLoaded
  • QueryName

Kill Chain Phase

  • Actions on Objectives

Known False Positives



Test Dataset

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

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