Our Analysts Found the HelloKittyCloud 409 Dump Circulating on Telegram

HEROIC analysts monitoring dark web channels and private Telegram groups identified the HelloKittyCloud 409 stealer log file circulating among cybercriminals in May 2023. The dump, uploaded by a Telegram user, contained 5,934 records harvested from infected computers -- each record holding an email address, a plaintext password, and the URLs of sites the victim visited. HelloKittyCloud is a recognized stealer log distribution channel, and the 409 designation marks a specific batch within a broader series of credential dumps. Finding this file in active circulation means it was not just sitting dormant -- criminals were actively downloading and using it to attak accounts.

Why This Is Dangerous

HelloKittyCloud 409 is dangerous precisely because of how it ended up on Telegram: through stealer malware that operates invisibly on victims' machines. The credentials in this file were never behind a corporate firewall -- they were captured directly from individuals' browsers and applications before any server-side security could intervene. The plaintext format means every password in the dump is immediately actionable. Attackers do not need to decrypt or crack anything. With 5,934 records in this single batch and the file distributed freely, the exposure window is wide open to anyone monitoring these Telegram channels.

What Was Exposed

• Email Addresses
• Plaintext Passwords (zero encryption, immediately usable)
• URLs (revealing which sites and services each victim logged into)

Why This Matters

Stealer log channels on Telegram like HelloKittyCloud operate as ongoing credential marketplaces, releasing new batches regularly to attract followers and build a reputation among cybercriminals. The 409 batch number suggests this is part of a long-running series, meaning the organization behind it is systematic and prolific. Victims whose data appears in this dump face account takeover risk on every service where they reused the exposed password. The email addresses also enable targeted phising attacks: now that attackers know what services a victim uses, they can craft convincing fake login pages to harvest additional credentials. The scale and organization of HelloKittyCloud distributions make this more than a one-time incident -- it is part of a broader credential-theft ecosytem.

How Stealer Log Malware Works

The HelloKittyCloud 409 dump was assembled from stealer malware infections on real computers. These infections typically begin when a user clicks a malicious link in a phishing email, downloads a cracked software installer, or installs a browser extension that turns out to be malware. Once active, the stealer silently queries the browser's local password database, extracting every saved username and password along with the associated URLs. It also searches for credential files in common application directories and reads autofill data. All of this is compressed into a log file and transmitted to the attacker's server, where it is sorted into batches and uploaded to distribution channels. HelloKittyCloud 409 represents one such batch, drawn from computers infected during the period leading up to May 2023.

Check If You Are Affected

HEROIC's free scanner covers more than 400 billion exposed records, including the HelloKittyCloud 409 dump and hundreds of similar stealer log batches. Enter your email address to find out immediately if your credentials are among the 5,934 exposed in this breach. If you appear in this file, prioritize changing your email account password first, since email access allows attackers to reset every other account you own. Then work through any finantial, work, and social accounts where you used the same password. Start your free scan at HEROIC now.