mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Eric McGinnis
55 lines
2.5 KiB
YAML
55 lines
2.5 KiB
YAML
name: Supernova Webshell
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id: 2ec08a09-9ff1-4dac-b59f-1efd57972ec1
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version: 10
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creation_date: '2021-01-06'
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modification_date: '2026-05-13'
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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, used in the SUNBURST attack, by identifying specific patterns in web URLs. The detection leverages Splunk to search for URLs containing "*logoimagehandler.ashx*codes*", "*logoimagehandler.ashx*clazz*", "*logoimagehandler.ashx*method*", and "*logoimagehandler.ashx*args*". This activity is significant as it indicates potential unauthorized access and arbitrary code execution on a compromised system. If confirmed malicious, this could lead to data theft, ransomware deployment, or other severe outcomes. Immediate steps include reviewing the web URLs, inspecting on-disk artifacts, and analyzing concurrent processes and network connections.
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data_source: []
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search: |-
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| tstats `security_content_summariesonly` count FROM datamodel=Web.Web
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WHERE web.url=*logoimagehandler.ashx*codes*
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OR
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Web.url=*logoimagehandler.ashx*clazz*
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OR
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Web.url=*logoimagehandler.ashx*method*
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OR
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Web.url=*logoimagehandler.ashx*args*
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BY Web.src Web.dest Web.url
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Web.vendor_product Web.user Web.http_user_agent
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_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 web traffic to your Solarwinds Orion. The logs should be ingested into splunk and populating/mapped to the Web data model.
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known_false_positives: There might be false positives associted with this detection 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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finding:
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title: Potential Supernova Webshell on $dest$
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entity:
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field: user
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type: user
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score: 50
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intermediate_findings:
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entities:
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- field: dest
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type: system
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score: 50
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message: Potential Supernova Webshell on $dest$
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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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category: web
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security_domain: network
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