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crt.go: An Open Source Tool for Threat Intelligence | OpenSec Atlas

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Threat Intelligence

Tool

crt.go

A fast command-line tool written in Go for scanning domains via crt.sh to gather certificate transparency data.

View on GitHub

About This Tool

Status: beta

Primary Use Case

This tool is primarily used by security researchers and threat intelligence analysts to quickly enumerate domains and subdomains by querying certificate transparency logs on crt.sh. It helps in OSINT investigations and vulnerability scanning by revealing domain certificates associated with a target.

Key Features

Fast scanning of domains using crt.sh
Written in Go for performance
Command-line interface for easy usage
Supports OSINT and vulnerability scanning workflows
Beta status indicating ongoing development

Insights & Recommendations

As the tool is in beta, users should be aware of potential bugs or incomplete features; ensure Go environment is set up if building from source.

Installation

Download or clone the repository from GitHub
Build the tool using Go or download precompiled binaries if available
Run the executable directly on supported platforms

Usage

./crt <TARGET>

Scans the specified target domain against crt.sh to retrieve associated certificate transparency data.

Smart Usage Notes

Integrate crt.go into automated OSINT pipelines to enhance domain enumeration speed and accuracy.Use crt.go results to enrich threat intelligence feeds with newly discovered subdomains and certificates.Combine crt.go outputs with vulnerability scanners to prioritize scanning of exposed subdomains.Leverage crt.go in red team reconnaissance phases to identify attack surface expansion opportunities.Incorporate crt.go scans into continuous monitoring workflows for early detection of unauthorized certificate issuance.