CIRCL Kunai Sandbox
CIRCL Kunai Sandbox: Free, open-source Linux sandbox analysis with behavior traces and network dumps. Ranked #20 of 33 in Online Virus Scanners by our editors (6.5/10); pricing: Free plan; best for linux sample analysis in a free self-hosted sandbox.
At a glance
- Editor score6.5 / 10
- PricingFree plan
- Best forLinux sample analysis in a free self-hosted sandbox
- Free planYes
- Paid fromFree
- File scanningYes
- Facts checked14 Nov 2026
Where it wins
- Runs Linux samples in isolation and records behavior with Kunai.
- Produces dynamic-analysis reports, Kunai traces, and network-traffic dumps.
- Free and open source, with x86_64 and aarch64 sandbox environments.
Where it doesn't
- Supports Linux samples only, not general-purpose file scanning.
- Does not scan URLs or a user's computer.
- Focused on dynamic analysis; static analysis is handled by CIRCL Pandora.
Our verdict on CIRCL Kunai Sandbox
CIRCL Kunai Sandbox is a public malware-analysis service for security analysts who need to observe Linux samples at runtime. It executes submitted samples in an isolated environment and records their behavior with Kunai, then generates dynamic-analysis reports. The service is available through a web interface, and its open-source code can also be installed as a self-hosted instance. This is a focused sandbox rather than a general-purpose online virus scanner: it is designed for sample execution and behavior observation, not URL scanning or on-demand scans of a user's computer.
The analysis output is its central strength. Reports include Kunai traces and network-traffic dumps, giving analysts runtime behavior to inspect rather than only a scan result. Sandbox environments support x86_64 and aarch64. That makes the product relevant for Linux sample investigations where execution behavior matters, while its Linux-only scope limits its fit for teams seeking broader operating-system coverage or a single destination for varied scanning tasks.
CIRCL offers the sandbox free and open source, with a public web interface as well as a self-hosted option for organizations that want to run a private instance. The choice suits analysts who need a no-cost route to dynamic Linux analysis and are comfortable operating a sandbox, especially where private deployment matters. It is a weaker match for buyers who need static analysis: CIRCL directs users to its separate Pandora service for static analysis of documents and other binaries. Choose Kunai for isolated Linux execution and behavior traces; choose another tool for URL, computer, or general-purpose scanning.
Your product? Our editors can test CIRCL Kunai Sandbox in depth and publish a review, labelled as paid · from $149/mo →
CIRCL Kunai Sandbox pricing
CIRCL Kunai Sandbox fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| File scanning | Yes |
| URL scanning | No |
| Computer scan | No |
| Analysis depth | Sandbox |
| File size limit | Not verified |
| Engines | Not verified |
| Deployment | Cloud, Self-hosted |
| Platforms | Web |
| Pricing | Free plan |
| Website | new.circl.lu |
| Facts checked | 14 Nov 2026 |
Alternatives to CIRCL Kunai Sandbox
- Joe SandboxA configurable sandbox for deep file, URL, network, and IOC analysis.8.9
- Hybrid AnalysisA free cloud sandbox combining file, URL, behavioral, network, and IOC analysis.8.8
- ANY.RUNA cloud sandbox for examining suspicious files and URLs through live behavior and network analysis.8.7
See all CIRCL Kunai Sandbox alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026
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