MAY 4 Stealer Log: 86,478 Credentials Exposed (Sep 2023)

86,478 Records: The Second Half of MAY 4's September 2023 Release

On September 26, 2023, the same Telegram channel that distributed the 89,770-record "MAY 4 - 3885 LOGS" file also posted a companion batch: "MAY 4 - 3818 LOGS" containing 86,478 additional plaintext U.S. credentials compiled from 3,818 individual stealer log files. Together, the two releases constituted a single-day distribution event of 176,248+ records -- one of the larger documented stealer log releases in 2023. For the tens of thousands of individuals across both batches, the impact is identically severe: every browser-stored credential harvested from their infected endpoints, packaged in plaintext, and distributed to anyone monitoring the channel.

MAY 4 (September 26, 2023): Breach Summary

• Records Exposed: 86,478
• Data Types: Plaintext credentials (email addresses, passwords, endpoint URLs, API hosts)
• Breach Type: Stealer log
• Country Affected: United States
• Date Leaked: September 26, 2023

3,818 Individual Log Files: What Bulk Compilation Tells Us

The "3818 LOGS" designation indicates this batch was assembled from 3,818 separate victim log files before being bundled into a single distributable package. Each individual file typically corresponds to one infected device -- one victim whose browser password store, session cookies, and saved credentials were exfiltrated by the malware. Aggregating 3,818 of these files requires time and organizational infrastructure. The malware had to infect 3,818 separate endpoints, phone home with their logs, and have those logs collected and packaged by the operator. This is not a smash-and-grab operation; it's systematic, patient, and capable of operating at meaningful scale without detection for an extended period before the September 2023 release.

The September 2023 Stealer Log Landscape

September 2023 represanted a period of intense stealer log activity across Telegram channels. Information-stealing malware families were proliferating, distribution infrastructure was becoming more commoditized, and the volume of credential logs circulating on underground channels was growing month-over-month. Large bulk releases like the MAY 4 two-upload event on September 26 were characteristic of this period -- operators aggregating months of harvested credentials and releasing them in volume, sometimes to attract subscribers, sometimes to monetize before rotating to new tools or infrastructure. For U.S.-based victims, September 2023 saw significant numbers of credentials from various campaigns entering active circulation.

Why This Batch Remains Relevant Years Later

Stealer log credentials from 2023 don't become safe simply because time has passed. Many victims never changed the passwords that appeared in these logs -- particularly for services they use infrequently or no longer remember having accounts with. Credentials from the MAY 4 September 2023 releases have had well over a year to circulate, be re-sold, be integrated into credential-stuffing toolkits, and be used against victims in slow-burn account-takeover campaigns. For individuals checking their exposure, this batch is not historical curiosity -- it's live threat intelligence about credentials that attackers may still hold and actively use. HEROIC's breach scanner checks against the full breadth of the database, including this 2023 release.

Check If Your Credentials Were Exposed

HEROIC's free breach scanner searches more than 400 billion exposed records, including both parts of the MAY 4 stealer log campaign and thousands of other breach sources going back years. Run a free scan at HEROIC.com to see whether your credentials appear in this or any other indexed breach.