OSINT, or Open Source Intelligence, refers to threat-related data collected from publicly available sources. These sources include websites, blogs, forums, social media, public code repositories, domain registration records, vulnerability databases, and news articles. OSINT is incredibly valuable because it is freely accessible, constantly updated, and can provide early warnings about threat actor activity, newly discovered vulnerabilities, or leaked credentials.
For example, a company might use OSINT to monitor if any employee credentials appear on breach forums or if their brand is being impersonated online. Security researchers also use OSINT to track threat actor behavior on darknet forums or to follow conversations around new malware tools.
However, OSINT comes with challenges. The information can be noisy, unverified, or misleading. Analysts must apply careful validation to separate legitimate threats from irrelevant or intentionally deceptive data. Despite this, when curated effectively, OSINT can provide early visibility into attack trends and attacker motivations.