The Cinoshi MaaS Stealer Dump Put 4,004 Accounts on the Dark Web

In May 2023, a Telegram user released the 202305_cinoshi_200_bonus stealer log, a batch of 4,004 records assembled by the Cinoshi malware-as-a-service (MaaS) platform. Unlike opportunistic one-off infections, Cinoshi was a commercial criminal subscription service that allowed multiple operators to deploy infostealer malware without technical expertise, dramtically lowering the barrier to credential theft at scale. HEROIC security analysts verified all 4,004 records in this dataset, confirming the exposed data includes plaintext passwords, email addresses, and login URLs ready for immediate deployment in account takeover attacks. Because this log originates from an organized MaaS platform, the credentials were likely already distributed to multiple criminal buyers before the Telegram release made them publicly available.

Why This Is Dangerous

Credentials harvested by a malware-as-a-service platform are structurally more dangerous than data from one-time breaches. Cinoshi subscribers received ready-formatted credential packages optimized for automated attack tools, meaning these 4,004 records were engineered from the start for rapid exploitation. The platform's commercial nature also means the data passed through multiple criminal hands before public disclosure, compounding the risk for affected users. With plaintext passwords and exact login URLs included, criminals needed no additional preparation -- they could load this file directly into credential stuffing software and begin testing within minuets of downloading it.

What Was Exposed

• Email Addresses: Your email address is the recovery gateway for every account you own. Criminals who control your email can bypass passwords entirely by triggering reset flows, intercepting confirmation codes, and locking you out of your own accounts.
• Plaintext Passwords: Cinoshi malware captured passwords exactly as they were stored in browser profiles -- no encryption, no hashing. These are immediately testable against any platform where a victim may have reused the same password.
• URLs: Each URL in the dataset pinpoints a specific platform or service where the credential was active, giving criminals a prioritized target list of high-value login pages to attack with the stolen data.

Why This Matters

The malware-as-a-service industry represents a fundamentally different threat model than traditional data breaches. When a single hacker breaches a database, the victim pool is defined by that one company's customer list. When a MaaS platform like Cinoshi distributes stealer software to dozens of criminal subscribers, the victim pool spans any device any subscriber managed to infect -- crossing industry boundaries, geographies, and account types in a single log file. The 4,004 records in this dump likely represent victims from multiple sectors whose only common thread is that their device was unfortunate enough to encounter a Cinoshi-distributed payload.

How Malware-as-a-Service Stealer Logs Work

The Cinoshi malware-as-a-service platform sold subscriptions to criminal operators who received ready-to-deploy infostealer software along with a command-and-control panel to collect harvested credentials. When a victim's device was infected -- typically via a fake software download, cracked game, or phishing link -- the Cinoshi stealer silently extracted every saved password, active session cookie, and browser-stored credential before transmitting the package to the operator's panel. Subscribers then sorted and sold the best credentials, with leftover batches bundled into bonus files like this 202305_cinoshi_200_bonus dump and released publicly on Telegram. Victims recieved no notification at any point in this process, and many remain unaware their credentials were compromised over two years ago.

Check If You Are Affected

HEROIC indexes Cinoshi MaaS logs, bonus dumps, and thousands of other stealer log datasets into a database of 400 billion+ exposed records that you can search for free. Visit heroic.com, enter your email address, and see instantly whether your credentials appear in the 202305_cinoshi_200_bonus dataset or any other verified breach. A free scan takes seconds and could stop an account takeover before it starts.