RTFSig is a free malware analysis solution. Stairwell Variant Discovery is a commercial malware analysis solution by Stairwell. Features, integrations, deployment and the company behind each one, side by side.
A tool for signature analysis of RTF files to detect potentially unique parts and malicious documents.
Expands a single malware hash into full family visibility via structural analysis.
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Based on what each listing shows: deployment, company size, price and open source.
RTFSig fits if you need to run it on your own servers, you are a startup or a small business, you need a free product and you want an open-source product.
Stairwell Variant Discovery fits if you want a cloud product.
Common questions when comparing RTFSig vs Stairwell Variant Discovery for malware analysis.
RTFSig: A tool for signature analysis of RTF files to detect potentially unique parts and malicious documents.
Stairwell Variant Discovery: Expands a single malware hash into full family visibility via structural analysis, built by Stairwell.
The table above shows where their features, integrations, deployment and company size fit differ.
RTFSig is open-source with 28 GitHub stars. Stairwell Variant Discovery is made by Stairwell. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.
Often, yes. RTFSig and Stairwell Variant Discovery are both Malware Analysis products, and both cover YARA. Key differences: RTFSig is Free while Stairwell Variant Discovery is Commercial, RTFSig is open-source. Use the table above to see where features, deployment and company size fit differ.
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Updated 2026-11-02
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