How the F – 143 PCS OCTOPUS Stealer Log Led to 2,883 Stolen Logins

HEROIC analysts uncovered the F - 143 PCS - OCTOPUS stealer log during routine monitoring of Telegram-based threat actor communities in August 2023. An anonymous user posted the file containing 2,883 records collected from compromised devices. The dump includes email addresses, plaintext passwords, and URLs that reveal which services the victims were actively using when the malware harvested their data.

Why This Is Dangerous

Plaintext passwords require zero effort from an attacker. There is no hashing, no cracking, no guessing involved. They simply take the email and password pair and try it on every major platform. The URLs included in this log go one step further by telling the attacker exactly which services each victim used, making targeted account takeover trivially easy for anyone with access to this file.

What Was Exposed in the F - 143 PCS OCTOPUS Log

• Email Addresses
• Plaintext Passwords
• URLs (sites and services the victim was accessing)

Why This Matters

Once stolen credentials circulate on Telegram, they spread quickly through the criminal ecosystem. Attackers use them for credential stuffing, running automated login attempts against hundreds of sites in minutes. A successfull hit leads to account takeover, and from a compromised email account, every other linked service becomes vulnerable. This is how identity theft begins and how financial fraud escalates. Because these passwords are plaintext, there is no time buffer. The damage can start the moment the log goes live.

How Stealer Log Malware Leads to Stolen Credentials

The F - 143 PCS OCTOPUS log did not come from a hacked company. It came from malware running on individual users' computers. An infostealer infection typically begins with something the victim clicked on, a phishing link, a pirated software installer, or a browser exploit on a compromised site. Once installed, the malware runs quietly in the background, reading saved passwords from browsers like Chrome and Firefox, capturing cookies from active sessions, and logging URLs visited. Everything it collects gets packaged into a structured log file and sent back to a command-and-control server. The attacker then sorts and sells the logs in batches, exactly like this one, on private Telegram channels and dark web markets.

Check If You Are Affected

HEROIC's free breach scanner checks your email address against a database of over 400 billion exposed records, including stealer logs like the F - 143 PCS OCTOPUS file. If your credentials were captured by this infostealer or any other known breach, you will see it right away.

Check your email free at HEROIC and find out if your passwords were exposed.