Combolists Posted to Telegram Data Breach (2024): What Was Exposed & What To Do

Credential-stuffing material and stealer-log dumps continue to circulate at industrial scale on messaging platforms, turning scattered past compromises into ready-to-use packages for account takeover. Against that backdrop, a large collation of combolists posted to Telegram was reported in late May 2024, bringing hundreds of millions of unique email addresses into a single, easily shared collection.

Public reporting describes roughly 2 billion rows of data containing 361.5 million unique email addresses, packaged as 122 GB across about 1,700 files. The material includes email addresses, usernames, passwords and, in many cases, the website where the credentials were entered. It appears to have been assembled from existing combolists and information-stealer malware rather than a single new corporate intrusion.

Inside the incident

According to the reported summary, the collection was collated in May 2024 from malicious Telegram channels. The data set is described as 2 billion rows with 361 million unique email addresses, occupying 122 GB in 1.7 thousand files. Named fields include email addresses, usernames and passwords; many records also indicate the website associated with the credential pair. The material is characterised as a combination of pre-existing combolists and output from info-stealer malware. No single victim organisation is identified as the original source of a fresh breach, and no specific threat group is attributed. Timing beyond the May 2024 reporting date, exact distribution methods inside Telegram, and any subsequent takedown actions remain undisclosed in the available record.

How a breach like this happens

Incidents of this type typically do not begin with one dramatic network intrusion. Instead, operators harvest credentials over time through commodity information-stealing malware that infects individual devices, or they simply re-package older breach dumps that have already circulated. These raw lists—often called combolists—are then cleaned, deduplicated and posted to public or semi-public Telegram channels where buyers and other criminals can download them. Because the data is aggregated from many earlier incidents, the resulting archive can contain hundreds of millions of unique addresses even though no new organisation was compromised on the day of publication. Once posted, the files spread rapidly through secondary channels and automated scrapers, remaining available long after any individual channel is removed.

Who is Combolists Posted to Telegram?

The label “Combolists Posted to Telegram” refers not to a conventional company or government agency but to a large, publicly reported aggregation of credential lists that appeared on the messaging platform. Combolists are collections of username–password pairs, frequently paired with the site or service for which they were created. Telegram has become a common distribution venue for such material because channels can host large files, reach wide audiences quickly, and operate with limited real-time moderation. Organisations and individuals whose credentials appear in these lists typically hold login data for consumer services, email accounts, e-commerce sites and other online platforms. When that material is collated and re-released at this scale, the practical effect is the same as a major data exposure: previously compromised credentials become freshly usable for automated attacks against any service that still accepts the same password.

What data was at risk

The reported collection explicitly names email addresses, usernames and passwords among the exposed data types. Many records also include the website into which the credentials were entered. Exact field-by-field contents of every file are not further itemised in public summaries, and no additional categories such as financial numbers, government identifiers or health records are confirmed. In general, combolists of this kind concentrate on authentication material rather than full identity dossiers; nevertheless, the presence of site-specific passwords means an attacker can immediately test those credentials against the original service and any other accounts where the same password was reused.

• Email addresses (approximately 361.5 million unique)
• Usernames
• Passwords
• Associated website or service (in many records)

Why it matters

For individuals whose addresses appear in the set, the immediate risk is credential stuffing: automated login attempts against email providers, social networks, banking portals and shopping sites. Successful reuse can lead to account takeover, fraudulent purchases, further malware distribution or social-engineering attacks against contacts. Because the data is already packaged for easy consumption, the window between publication and widespread abuse is short. For any organisation whose users are represented, the secondary effect is elevated login-failure noise, potential support-load spikes and the need to force password resets or enable multi-factor authentication more aggressively. The incident also illustrates how older stealer logs and breach dumps continue to generate harm years after the original infections, simply by being re-collated and re-shared.

Were you affected?

If you used the same password across multiple sites, treat any matching email address as compromised. Change the password on the original service and on every other account that shared it; enable multi-factor authentication wherever it is offered; and monitor email and financial accounts for unexpected activity. Readers can also run a free exposure scan of their email address to check whether it has already surfaced in known breach data sets of this kind. Public detail on remediation steps taken by Telegram channel operators or by any original data sources remains limited; individual defensive actions therefore remain the most reliable immediate response.

AICompiled with AI assistance from public sources and published under our editorial standards.