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Inactive · #83 by victimsRansomware group

Quantum

As of Oct 19, 2026, Quantum has listed 79 confirmed victims on its leak site since Feb 14, 2024, 0.2% of all victims tracked by Brandefense. Its most targeted country is United States (35.4% of its victims) and its most targeted sector is Consulting.

Quantum ransomware, active from mid-2021 through 2022, was a rebrand of the MountLocker/AstroLocker/XingLocker lineage that operated as RaaS, known for extremely fast attack timelines (under four hours from initial access to encryption) and ransom demands ranging from $150,000 to multi-million dollars.

Also known asQuantumLockerMount LockerDagonLockerMount-Locker
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Confirmed Victims
79
Rank By Victims
#83
Last Leak-Site Post
Jul 12, 2025
Top Country
United States
Top Sector
Consulting

Victims Posted Per Month.

Quantum confirmed victims per month
MonthConfirmed victims
February 20242
March 20246
April 20241
May 20245
June 20240
July 20240
August 20240
September 20240
October 20240
November 20240
December 20240
January 20250
February 20250
March 20250
April 20250
May 20250
June 20250
July 202565
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 Quantum Victims.

Search all 79 →
Latest confirmed leak-site victims claimed by Quantum
VictimCountryIndustryData claimedPosted
Lewis & Clark College
lclark.edu
USUnited StatesEducation and ResearchNot stated
Midland Cogeneration Venture
midcodegen.com
USUnited StatesUnknown150 GB
Rosenblatt Securities
rblt.com
USUnited StatesFinancial Services20 GB
Shaw & Slavsky
shawandslavsky.com
USUnited StatesUnknown6 GB
Freyr Solutions
freyrsolutions.com
USUnited StatesHealthcareNot stated
Delon Hampton & Associates
delonhampton.com
USUnited StatesUnknownNot stated

How They Operate.

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

TTPs, CVEs and malware →

Who Quantum Targets.

Sectors

  1. Consulting45.1%
  2. Healthcare45.1%
  3. Government and Public Sector33.8%
  4. Legal Services33.8%
  5. Manufacturing22.5%

Countries

  1. USUnited States2835.4%
  2. CACanada67.6%
  3. AEUnited Arab Emirates33.8%
  4. AUAustralia33.8%
  5. IRIran22.5%
Shares are of this group's confirmed victims.

History.


  1. First seen in Brandefense data

  2. First confirmed victim listed on its leak site

  3. Busiest month on record: 65 confirmed victims

  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.