Use a reputable service to see if your email address has appeared in any known data breaches.
At its core, a "combolist" is a plain-text file containing thousands, or even millions, of username (or email) and password combinations. These lists are the primary fuel for credential stuffing attacks—a technique where hackers use automated scripts to try these pairs across various websites, hoping to find a match. The "russiaemail" and "hq" (high quality) tags suggest that this specific list is targeted toward Russian domains and is curated to have a higher success rate than generic dumps.
Their investigation led them through encrypted channels and anonymous messaging apps, a world where digital footprints were intentionally erased. But Alex and Sasha were determined and skilled, using their expertise in reverse engineering and network tracing to follow the digital breadcrumbs.