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mmc.com Domain Breach Exposure Report

Risk Score

Medium Risk

Moderate exposure in standard leak repositories.

AI Findings Summary

Elevated

The domain mmc.com has experienced a significant number of data breaches and infostealer events over the past year, with 1375 historical data breaches and 221 active infostealer logs. The majority of these events are linked to combolist sources, indicating potential credential stuffing attacks. While the majority of affected entities are clients (1593), there have been 3 employee-related events. Malware families such as LummaC2, Acreed, and Redline are frequently observed, suggesting a high risk of credential compromise and further data exfiltration. The primary services targeted include mmc.com itself and various secure email portals, indicating a focus on accessing sensitive communications and potentially user credentials.

Total Events

1,596
credential exposure events

Employee Affected Events

3
account email domain = mmc.com

Client Affected Events

1,593
service target = mmc.com

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12-Month Events Timeline

Event volume by breach date, employee VS client

EmployeesClients
6004002000
peak month 586
Jul 25Sep 25Nov 25Jan 26Mar 26May 26Jun 26

Infostealers VS Data Breaches

Live stealer logs VS data breaches

Infostealer logs
Events221
Share14%
Data breaches
Events1,375
Share86%
Infostealer logs (14%)
221events
Data breaches (86%)
1,375events

3 compromised employee accounts pose an infrastructure risk, while 1,593 leaked client credentials create regulatory liability.

Antivirus Distribution

Security Tools on Infected Endpoints

Windows Defender Sentinel Agent8
Windows Defender1

Malware Families Distribution

Distribution of Active Stealer Strains

LummaC247
Acreed33
Redline25
Rhadamanthys15
Vidar14
Millenium10
Blank Grabber9
StealC4
X-Files4

Top Login URLs

Top exposed services found in the event results

  1. 1mmc.com511
  2. 2https://secureemail.mmc.com/formpostdir/securereader92
  3. 3https://secureemail.mmc.com58
  4. 4secureemail.mmc.com51
  5. 5https://secureemail.mmc.com/securereader/registration.jsf48
  6. 6https://secureemail.mmc.com/formpostdir/safeformpost.aspx48
  7. 7secureemail.mmc.com/formpostdir/securereader47
  8. 8https://securemail.mmc.com/websafe/register33
  9. 9secureemail.mmc.com/formpostdir/safeformpost.aspx29
  10. 10https://colleagueconnect.mmc.com/29

Infostealer By Geography

Shows the distribution of Infostealer-related credential exposure events across different geographic regions. The location is determined by analyzing the metadata of the infected machines associated with each event.

United States
Events36
Mexico
Events17
India
Events8
South Africa
Events8
Singapore
Events6
United Kingdom
Events6

Country Breakdown

  1. 1United States36
  2. 2Mexico17
  3. 3Dominican Republic15
  4. 4India8
  5. 5South Africa8
  6. 6Singapore6
  7. 7United Kingdom6
  8. 8Hong Kong SAR China4

Services Classification Distribution

Blast radius - closer to core = more critical infrastructure, size = credential volume

Pulse Secure35
F53
Citrix2

Operating System Distribution

Distribution of compromised endpoint builds

Windows 1141
Windows 10 Pro (10.0.19045) x6421
Windows 10 22H2 build 21996 (64 Bit)12
Windows 10 Enterprise x6411
Windows 11 Home11

Leak Repository Classification

Where the exposed records currently reside

0
Named breaches
1,216
Combolist pools
159
Unattributed dumps

Disclaimer: This report includes AI-generated content. AI can make mistakes, so verify important findings independently before taking action.