Academy
TermUnderground market

Log market

Forums, sites and messaging channels where logs collected by infostealers and account access are sold.

Flow

  1. 1Logs are uploaded
  2. 2Searched
  3. 3Bought
Related families
Lumma Stealer
MITRE ATT&CK
T1539 · Steal Web Session Cookie
Sources
4 sources
01

Overview

Stolen data is not income for the attacker on its own; it becomes income when sold. Logs change hands through forum listings, searchable catalogues on dedicated sites or bulk files in Telegram channels. CISA and FBI (AA25-141B)

According to Eurojust, Genesis Market sold packages of usernames and passwords for email, bank and social media accounts and, from 2018 until it was taken down, was one of the largest facilitators of cybercrime. Eurojust

02

How it works

  1. 1

    Logs are uploaded

    The seller uploads logs from infected devices to the market or channel. CISA and FBI (AA25-141B)

  2. 2

    Searched

    The buyer searches by country, domain or service name.

  3. 3

    Bought

    The buyer purchases the log or account access and uses or resells it. Eurojust

03

Real-world examples

Genesis Market taken down

In Operation Cookie Monster, supported by Eurojust, Genesis Market’s infrastructure was dismantled; in 13 countries more than 100 arrests and more than 200 searches targeted customers who had bought stolen access from the market. Eurojust

Bulk distribution on Telegram

Troy Hunt examined a 1.5 TB corpus of logs published as individual files in a Telegram channel called ALIEN TXTBASE and noted that the channel is not the only one, but a major distribution channel. Troy Hunt

04

How to detect it

05

What to do

  • Change the password of the account found, end its open sessions and examine the device it came from separately. MITRE ATT&CK
06

MITRE ATT&CK

07

Related families and terms

08

Sources

  1. 1Steal Web Session Cookie (T1539) · MITRE ATT&CK
  2. 2Threat Actors Deploy LummaC2 Malware to Exfiltrate Sensitive Data from Organizations · CISA and FBI (AA25-141B), 2025-05-21
  3. 3Online market selling stolen account credentials to criminals worldwide taken down in multi-country effort dubbed Operation Cookie Monster · Eurojust, 2023-04-05
  4. 4Processing 23 Billion Rows of ALIEN TXTBASE Stealer Logs · Troy Hunt, 2025-02-26
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