Sunburst Correlation DLL and Network Event

WARNING THIS IS A EXPERIMENTAL object

We have not been able to test, simulate, or build datasets for this object. Use at your own risk. This analytic is NOT supported.

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Description

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
Last Updated: 2020-12-14
Author: Patrick Bareiss, Splunk
ID: 701a8740-e8db-40df-9190-5516d3819787

Annotations

ATT&CK

ID	Technique	Tactic
T1203	Exploitation for Client Execution	Execution

Kill Chain Phase

Actions on Objectives

NIST

DE.CM

CIS20

CIS 6
CIS 8

CVE

Search

(`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` 

Macros

The SPL above uses the following Macros:

Note that sunburst_correlation_dll_and_network_event_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Required field

_time
EventCode
ImageLoaded
QueryName

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.

Known False Positives

unknown

Associated Analytic story

NOBELIUM Group

RBA

Risk Score	Impact	Confidence	Message
25.0	50	50	tbd

Reference

https://www.fireeye.com/blog/threat-research/2020/12/evasive-attacker-leverages-solarwinds-supply-chain-compromises-with-sunburst-backdoor.html

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

source | version: 1

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