mirror of
https://github.com/splunk/security_content
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Michael Haag
55 lines
2.3 KiB
YAML
55 lines
2.3 KiB
YAML
name: Supernova Webshell
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id: 2ec08a09-9ff1-4dac-b59f-1efd57972ec1
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version: 7
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date: '2025-09-16'
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author: John Stoner, Splunk
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status: experimental
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type: TTP
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description: The following analytic detects the presence of the Supernova webshell,
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used in the SUNBURST attack, by identifying specific patterns in web URLs. The detection
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leverages Splunk to search for URLs containing "*logoimagehandler.ashx*codes*",
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"*logoimagehandler.ashx*clazz*", "*logoimagehandler.ashx*method*", and "*logoimagehandler.ashx*args*".
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This activity is significant as it indicates potential unauthorized access and arbitrary
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code execution on a compromised system. If confirmed malicious, this could lead
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to data theft, ransomware deployment, or other severe outcomes. Immediate steps
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include reviewing the web URLs, inspecting on-disk artifacts, and analyzing concurrent
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processes and network connections.
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data_source: []
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search: '| tstats `security_content_summariesonly` count from datamodel=Web.Web where
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web.url=*logoimagehandler.ashx*codes* OR Web.url=*logoimagehandler.ashx*clazz* OR
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Web.url=*logoimagehandler.ashx*method* OR Web.url=*logoimagehandler.ashx*args* by
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Web.src Web.dest Web.url Web.vendor_product Web.user Web.http_user_agent _time span=1s
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| `supernova_webshell_filter`'
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how_to_implement: To successfully implement this search, you need to be monitoring
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web traffic to your Solarwinds Orion. The logs should be ingested into splunk and
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populating/mapped to the Web data model.
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known_false_positives: There might be false positives associted with this detection
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since items like args as a web argument is pretty generic.
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references:
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- https://www.splunk.com/en_us/blog/security/detecting-supernova-malware-solarwinds-continued.html
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- https://www.guidepointsecurity.com/blog/supernova-solarwinds-net-webshell-analysis/
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rba:
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message: Potential Supernova Webshell on $dest$
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risk_objects:
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- field: user
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type: user
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score: 25
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- field: dest
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type: system
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score: 25
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threat_objects: []
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tags:
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analytic_story:
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- NOBELIUM Group
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- Earth Alux
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- GhostRedirector IIS Module and Rungan Backdoor
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asset_type: Web Server
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mitre_attack_id:
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- T1505.003
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- T1133
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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: network
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