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Inactive · #147 by victimsRansomware group

Underground

As of Oct 19, 2026, Underground has listed 27 confirmed victims on its leak site since Jul 18, 2023, 0.1% of all victims tracked by Brandefense. Its most targeted country is United States (33.3% of its victims) and its most targeted sector is Manufacturing.

Underground ransomware is deployed by the Russia-based RomCom group (Storm-0978) and has victimized companies across multiple industries since July 2023 by exploiting CVE-[removed], encrypting files without changing extensions and deleting Volume Shadow Copies and Windows event logs in double-extortion campaigns.

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Confirmed Victims
27
Rank By Victims
#147
Last Leak-Site Post
Aug 15, 2025
Top Country
United States
Top Sector
Manufacturing

Victims Posted Per Month.

Underground confirmed victims per month
MonthConfirmed victims
July 20231
August 20230
September 20230
October 20230
November 20230
December 20230
January 20240
February 20241
March 20241
April 20240
May 202412
June 20242
July 20242
August 20240
September 20240
October 20242
November 20240
December 20241
January 20250
February 20251
March 20250
April 20252
May 20250
June 20251
July 20250
August 20251
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 Underground Victims.

Search all 27 →
Latest confirmed leak-site victims claimed by Underground
VictimCountryIndustryData claimedPosted
SFA Engineering
sfa.co.kr
KRSouth KoreaConsultingNot stated
GMORS Co., Ltd
gmors.com
TWTaiwanManufacturing, ChemicalsNot stated
semex.com
semex.com
CACanadaHealthcareNot stated
shengyusteel.com
shengyusteel.com
TWTaiwanManufacturing, MiningNot stated
Afa Systems LTD
afasystemsinc.com
CACanadaUnknown1.1 TB
Simmtech
simmtech.com
KRSouth KoreaFinancial Services745.1 GB

How They Operate.

Underground's threat actor profile lists 11 ATT&CK techniques, 2 malware and tools, with its targets and related actors.

TTPs, CVEs and malware →

Who Underground Targets.

Sectors

  1. Manufacturing725.9%
  2. Consulting414.8%
  3. Construction311.1%
  4. Healthcare27.4%
  5. Technology27.4%

Countries

  1. USUnited States933.3%
  2. KRSouth Korea414.8%
  3. CACanada311.1%
  4. TWTaiwan311.1%
  5. DEGermany13.7%
Shares are of this group's confirmed victims.

History.


  1. First confirmed victim listed on its leak site

  2. Busiest month on record: 12 confirmed victims

  3. First seen in Brandefense data

  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.