A cybercrime group is a criminal network that runs hacking, fraud, extortion, or theft operations. These groups may be small crews or larger organizations with separate roles for intrusion, malware development, payment collection, and money laundering. They often reuse infrastructure, identities, and tactics across many targets, which makes them harder to track than a lone attacker.
In cyber security, identifying a group matters because defenders can connect individual alerts into one campaign. Shared indicators such as phishing domains, command-and-control servers, ransomware notes, and stolen credentials can reveal the same operator behind multiple incidents. Law enforcement and security teams use this clustering to prioritize investigations, block infrastructure, and attribute activity to known criminal patterns. Cybercrime groups also adapt quickly, so coordinated response, threat intelligence sharing, and incident containment are key defenses. The term is common in reporting about ransomware crews, financial theft rings, and phishing operations that work across borders and switch tools to evade detection.