⚠️ WARNING THIS IS A EXPERIMENTAL DETECTION

We have not been able to test, simulate or build datasets for it, use at your own risk!

Try in Splunk Security Cloud

Description

This search aims to detect the Supernova webshell used in the SUNBURST attack.

  • Type: TTP
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel: Web
  • Last Updated: 2021-01-06
  • Author: John Stoner, Splunk
  • ID: 2ec08a09-9ff1-4dac-b59f-1efd57972ec1

ATT&CK

ID Technique Tactic
T1505.003 Web Shell Persistence

| tstats `security_content_summariesonly` count from datamodel=Web.Web where web.url=*logoimagehandler.ashx*codes* OR Web.url=*logoimagehandler.ashx*clazz* OR Web.url=*logoimagehandler.ashx*method* OR Web.url=*logoimagehandler.ashx*args* by Web.src Web.dest Web.url Web.vendor_product Web.user Web.http_user_agent _time span=1s 
| `supernova_webshell_filter`

Associated Analytic Story

How To Implement

To successfully implement this search, you need to be monitoring web traffic to your Solarwinds Orion. The logs should be ingested into splunk and populating/mapped to the Web data model.

Required field

  • _time
  • Web.url
  • Web.src
  • Web.dest
  • Web.vendor_product
  • Web.user
  • Web.http_user_agent

Kill Chain Phase

  • Exfiltration

Known False Positives

There might be false positives associted with this detection since items like args as a web argument is pretty generic.

Reference

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