Inside the Aliyun Stealer Logs: 3,828 Passwords Harvested

HEROIC analysts uncovered a stealer log file targeting aliyun.com users that was shared on Telegram in June 2026. The file contains 3,828 records, each including an email address, a plaintext password, and the URL where the credential was intercepted. Aliyun.com is the email domain for Alibaba Cloud (Aliyun), one of China's largest cloud computing and email platforms, making this leak particularly relevant to Chinese-speaking users and businesses that rely on Alibaba's ecosystem.

The exposure of nearly 4,000 Alibaba Cloud-linked credentials in plaintext creates a direct pathway to account compromise. These accounts may be connected to cloud infrastructure, e-commerce operations, and business communications, elevating the stakes well beyond personal email access.

Why Plaintext Cloud Service Passwords Carry Elevated Risk

The passwords in this stealer log are stored in their raw, unencrypted form. Attackers can read them instantly and use them without any processing. When the compromised credentials are tied to a cloud service provider like Alibaba Cloud, the potential damage extends beyond email into cloud computing resources, virtual servers, database access, and business applications.

An attacker who gains access to an aliyun.com account may also reach Alibaba Cloud console access, Taobao marketplace accounts, Alipay financial services, and other platforms within Alibaba's interconnected ecosystem. The plaintext nature of these passwords means there is no technical barrier between the attacker and this entire range of services.

What Was Exposed in the Aliyun Dump

• Email Addresses — Alibaba Cloud email accounts that may be linked to business operations, cloud infrastructure management, and the broader Alibaba service ecosystem.
• Plaintext Passwords — Unencrypted credentials captured directly from infected devices, immediately usable against aliyun.com accounts and any other services sharing the same password.
• URLs — The specific websites and cloud service portals where each credential was intercepted, revealing which Alibaba and third-party services each victim actively uses.

Why 3,828 Cloud Platform Credentials Pose Business-Level Threats

Unlike consumer email breaches, compromised aliyun.com credentials can provide access to business-critical infrastructure. Users of Alibaba Cloud may manage virtual servers, databases, content delivery networks, and enterprise applications through their aliyun.com accounts. A single compromised credential could give an attacker control over production systems, customer data, or financial transactions.

At 3,828 records, this leak provides attackers with enough credentials to conduct targeted campaigns against Chinese businesses and their international partners. Credential stuffing operations will test each email and password pair against Alibaba's various platforms as well as unrelated services, exploiting the password reuse that affects over 60% of internet users globally.

How Stealer Logs Compromise Cloud Platform Credentials

Infostealer malware captures credentials indiscriminately from infected devices. When a user logs into aliyun.com or any Alibaba service through their browser, the malware intercepts the email and password in real time. It also extracts any Alibaba credentials saved in the browser's password manager and captures authentication cookies that could provide persistent access.

The harvested data is compiled into log files and organized by email domain, making it easy for attackers to isolate high-value targets like cloud service users. The aliyun.com stealer log was distributed on Telegram, where it becomes accessible to threat actors worldwide — including those who specifically target Chinese cloud infrastructure and the businesses that depend on it.

Check If Your Credentials Were Exposed

If you use an aliyun.com email address or access any Alibaba Cloud services, checking your exposure is critical. HEROIC's free breach scanner searches more than 400 billion compromised records to determine whether your credentials appear in this stealer log or any other known data breach.

If your credentials are found, change your aliyun.com password immediately. Review all connected Alibaba Cloud services for unauthorized access, rotate any API keys or access tokens associated with your account, and enable multi-factor authentication. Run a malware scan on all devices you use to access Alibaba services to ensure no infostealer remains active.