The DataCloudSpace 738 Log Means Someone Could Be Logging Into Your Accounts

What HEROIC Analysts Discovered in the DataCloudSpace 738 Stealer Log

In July 2023, HEROIC analysts identified a stealer log batch uploaded to a Telegram channel by an anonymous user. The file, labeled "738 logs datacloudspace," contained 10,026 records harvested from compromised endpoints. The 738 figure in the name refers to the number of individual log packages bundled together. Each record in the compiled dataset included an email address, a plaintext password, and the URL of the site where the credential was captured by malware running on the victim's device.

The DataCloudSpace name points to a cloud-based infostealer infrastructure -- a system designed to receive stolen credentials from infected computers in real time and package them for distribution. Every one of the 10,026 records in this dataset came from a real person's infected computer.

The DataCloudSpace Leak Means Someone Could Already Have Your Login

Imagine waking up to find your email account locked. Your bank is sending alerts about transfers you did not make. Your streaming accounts have been accessed from cities you have never visited. That is the realistic outcome for anyone whose credentials appeared in the DataCloudSpace 738 stealer log and who has not yet changed those passwords.

The file contains 10,026 plaintext passwords -- completely unprotected, readable by anyone who opens the dataset. Combined with matching email addresses and URLs, each record is a fully functional login kit. There is no guessing, no cracking, no delay. An attacker opens the file and starts attempting logins imediately.

What Was Exposed in the DataCloudSpace 738 Log

• Email Addresses
• Plaintext Passwords
• URLs (the exact websites and services captured by the malware on each infected device)

Why the DataCloudSpace Leak Creates Cascading Account Takeover Risk

Credential stuffing tools can cycle through all 10,026 records in minutes. Every major platform -- email providers, banks, social networks, e-commerce sites -- gets tested against the dataset. When a match is found, the attacker is in. Most victims do not realise this has happend until they notice unusual activity days or weeks later.

The URL field in this log is particularly revealing. It tells attackers exactly which services each victim was using, allowing them to target the most valuable accounts first. An email account credential means access to password reset flows for everything else the victim owns. A banking URL in the record means direct financial exposure. Identity theft becomes straightforward when attackers have this level of detail.

How the DataCloudSpace Stealer Infrastructure Operates

DataCloudSpace appears to be a cloud-based credential harvesting operation. Infostealer malware installed on victims' computers -- through phishing emails, pirated software, or malicious ads -- quietly extracts saved browser passwords, session cookies, and credentials typed into login forms. Instead of storing this data locally, the malware transmits it in real time to a cloud server controlled by the threat actor.

The operator then compiles the incoming data into numbered log batches. The "738 logs" label indicates this was one such batch -- 738 individual log files from 738 infected machines, compiled into a single release. The batch was uploaded to Telegram in July 2023, where it became freely availible to thousands of subscribers. Once shared on Telegram, these files cannot be recalled -- they spread to forums, file-sharing sites, and private channels with no way to stop them.

Victims have no indication their device was compromised. The malware leaves no visible sign, and the data is exfiltrated silently in the background.

Check If Your Email Is in the DataCloudSpace 738 Batch

HEROIC's breach database contains over 400 billion exposed records, including this DataCloudSpace stealer log and thousands of similar files from underground channels. If your email adress was captured by this malware and included in the 738-batch upload, HEROIC's free breach scanner will surface it.

Search your email now. If you appear in the DataCloudSpace 738 log, change the password for every site listed in the URL field immediately. Then check every other account that shares that password. Enable two-factor authentication on your email first -- that single step blocks the majority of account takeover attempts that follow credential leaks like this one.