Common Infostealers

## Executive Summary ReliaQuest Threat Research reports a significant increase in infostealer activity in Q4 2023—highlighting LummaC2, RedLine, and Raccoon as the most prevalent families—documenting distribution methods (phishing, trojanized installers, adware), targeted data (credentials, cookies, crypto wallets, browser extensions), a LummaC2 case study with IoCs, and recommended mitigations such as certificate-based authentication, enterprise browsers, and Digital Risk Protection.