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zeek_ja3_hunt

Compares JA3 fingerprints in SSL logs against a built-in malware database to identify known threats like CobaltStrike or Emotet.

Instructions

Hunt for known malicious JA3 fingerprints across SSL logs. Compares all observed JA3 hashes against a built-in database of malware families (CobaltStrike, Emotet, TrickBot, etc.) and returns any matches.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
timeToNoEnd time (ISO 8601)
timeFromNoStart time (ISO 8601)
customHashesNoAdditional JA3 hashes to hunt for beyond the built-in database
Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description carries full burden. It describes the tool as a search/matching operation, implying it is read-only, but does not explicitly state behavioral traits like mutability or safety. With no annotations, this is adequate but could be more explicit.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is two sentences, front-loaded with the key action and resource, and contains no wasted words. It is appropriately sized for the tool's simplicity.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a tool with 3 optional parameters and no output schema, the description explains the core functionality adequately. It could mention the output format or behavior when no matches are found, but it is still sufficient.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the schema already documents all parameters. The description adds no further meaning beyond what the schema provides for timeFrom, timeTo, and customHashes, so baseline of 3 is appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool hunts for known malicious JA3 fingerprints using a built-in malware database. It is specific about the resource (JA3 hashes) and distinguishes it from sibling tools like zeek_ja3_fingerprints that likely list all fingerprints.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description indicates the tool compares against a built-in database and allows custom hashes. It provides context for use but does not explicitly state when to use it versus alternatives like zeek_ja3_fingerprints.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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