Ransomware group profile · #144 by claimed victims

Underground ransomware

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-2023-36884, encrypting files without changing extensions and deleting Volume Shadow Copies and Windows event logs in double-extortion campaigns.

Active First seen May 2024

26Victims claimed on leak sites

0Victims in the last 30 days

0Victims in the last 90 days

11Countries hit

0Leak-site URLs tracked

15 Aug 2025Latest claim recorded

Victimology

Who Underground claims to have breached, from 26 leak-site posts recorded by VULONE.

Claims per month last 12 months

Top sectors

Technology7

Healthcare5

Professional Services5

Manufacturing5

Agriculture and Food Production2

Transportation1

Financial Services1

Top countries

United States9

South Korea3

Canada3

Taiwan2

Germany2

Spain1

Japan1

United Arab Emirates1

Latest claimed victims 12 most recent

Victim	Sector	Country	Claimed
SFA Engineering sfa.co.kr	Technology	KR	15 Aug 2025
GMORS Co., Ltd gmors.com	Manufacturing	TW	25 Jun 2025
Afa Systems Ltd. afasystemsinc.com	Technology	CA	16 Apr 2025
shengyusteel.com shengyusteel.com	Manufacturing	TW	16 Apr 2025
semex.com semex.com	Agriculture and Food Production	CA	16 Apr 2025
Simmtech Co., Ltd. simmtech.com	Technology	KR	16 Dec 2024
hcsgcorp.com hcsgcorp.com	Healthcare	US	25 Oct 2024
Casio Computer Co., Ltd casio.co.jp	Technology	JP	10 Oct 2024
ramservices.com ramservices.com	Professional Services	US	3 Jul 2024
Ethypharm ethypharm.com	Healthcare	FR	1 Jul 2024
A-Line Staffing Solutions alinestaffing.com	Healthcare	US	17 Jun 2024
belcherpharma.com belcherpharma.com	Healthcare	US	12 Jun 2024

All 26 Underground victims, searchable

Full victim list with claim posts, domains, timing and exports, plus the negotiation chats and leak-site screenshots VULONE archives for this crew.

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Tactics, techniques and procedures

ATT&CK technique mapping for Underground is in progress. Victimology, infrastructure status and leak-site tracking are live above.

Indicators, detections and the full playbook

Hashes, C2 addresses, onion services, Sigma and YARA detections per technique, and the negotiation transcripts are available to signed-in analysts.

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Frequently asked

Is Underground ransomware still active?

Underground is tracked as active. The most recent leak-site claim VULONE recorded is dated 15 August 2025.

How many victims has Underground claimed?

VULONE has recorded 26 leak-site victim claims attributed to Underground since May 2024, across 11 countries and 7 sectors.

Which industries does Underground target?

The sectors most often named on the Underground leak site are Technology, Healthcare, Professional Services.

Which countries are most affected by Underground?

Most Underground victims recorded by VULONE are located in United States, South Korea, Canada.

Where does VULONE get Underground victim data?

Claims are collected continuously from the group's own leak sites and cross-checked with ransomware.live and RansomLook. A claim is the group's assertion, not a confirmed breach.

VULONE research mentioning Underground

NASBleed: Inside a 343k-Host Credential Spill343,000 plain-text NAS and RDP logins found sitting in an open directory, most of them factory defaults. How the dump feeds access brokers, Cyberleek: Mapping the Actor Behind the Leak The Cyberleek attribution has been questioned after an analysis of the evidence surrounding the GnomodelincuenT claim. This report examines QUAKE3, The XSS Moderator Who Wrote REvil

Other ransomware groups

Victim claims are collected from leak sites and enrichment partners (ransomware.live, RansomLook) and represent the group's own assertions, not confirmed breaches. Profile last updated 16 September 2026. Questions or corrections: [email protected].