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Inactive · #177 by victimsRansomware group

Mount Locker

As of Oct 19, 2026, Mount Locker has listed 18 confirmed victims on its leak site since Jul 11, 2025, 0.1% of all victims tracked by Brandefense.

MountLocker operated as a ransomware-as-a-service from July 2020, using a standard developer/affiliate revenue split and leveraging compromised RDP credentials for initial access, propagating laterally via Windows Active Directory APIs and targeting over 2,600 file extensions.

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Confirmed Victims
18
Rank By Victims
#177
Last Leak-Site Post
Jul 11, 2025
Top Country
Unknown
Top Sector
Unknown

Victims Posted Per Month.

Mount Locker confirmed victims per month
MonthConfirmed victims
July 202518
August 20250
September 20250
October 20250
November 20250
December 20250
January 20260
February 20260
March 20260
April 20260
May 20260
June 20260
July 20260
August 20260
September 20260
October 2026 (month in progress)0
Updated continuously · figures as of Oct 19, 2026

Latest Mount Locker Victims.

Search all 18 →
Latest confirmed leak-site victims claimed by Mount Locker
VictimCountryIndustryData claimedPosted
Memry CorporationUnknownUnknownNot stated
ThyssenKrupp System EngineeringUnknownUnknownNot stated
Century 3, Inc.UnknownUnknownNot stated
Amey plcUnknownUnknownNot stated
Transtar1UnknownUnknownNot stated
WasserstormUnknownUnknownNot stated

How They Operate.

Mount Locker's threat actor profile lists 1 ATT&CK techniques, 1 malware and tools, with its targets and related actors.

TTPs, CVEs and malware →

History.


  1. First seen in Brandefense data

  2. Busiest month on record: 18 confirmed victims

  3. First confirmed victim listed on its leak site

  4. Most recent leak-site post

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Figures as of Oct 19, 2026. Confirmed leak-site claims collected by Brandefense technologies and validated by Brandefense analysts.

Listed on a leak site means a ransomware group has claimed the company; it is not a confirmed breach. To request a correction or removal, contact Brandefense.