analyzing-certificate-transparency-for-phishing

1# Analyzing Certificate Transparency for Phishing
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3## Overview
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5Certificate Transparency (CT) is an Internet security standard that creates a public, append-only log of all issued SSL/TLS certificates. Monitoring CT logs enables early detection of phishing domains that register certificates mimicking legitimate brands, unauthorized certificate issuance for owned domains, and certificate-based attack infrastructure. This skill covers querying CT logs via crt.sh, real-time monitoring with Certstream, building automated alerting for suspicious certificates, and integrating findings into threat intelligence workflows.
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8## When to Use
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10- When investigating security incidents that require analyzing certificate transparency for phishing
11- When building detection rules or threat hunting queries for this domain
12- When SOC analysts need structured procedures for this analysis type
13- When validating security monitoring coverage for related attack techniques
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15## Prerequisites
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17- Python 3.9+ with `requests`, `certstream`, `tldextract`, `Levenshtein` libraries
18- Access to crt.sh (https://crt.sh/) for historical CT log queries
19- Certstream (https://certstream.calidog.io/) for real-time monitoring
20- List of organization domains and brand keywords to monitor
21- Understanding of SSL/TLS certificate structure and issuance process
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23## Key Concepts
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25### Certificate Transparency Logs
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