Was JBCC Corp hit by ransomware?

JBCC Corp was listed by the Mallox ransomware operation (United States), and stolen data was published on the group's leak site. Darkfield tracks this disclosure with the original leak post, screenshot and group context.

Who is the Mallox ransomware group?

Mallox is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

What data was leaked in the JBCC Corp breach?

Mallox published data attributed to JBCC Corp. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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JBCC Holdings Corporation

listed as JBCC Corp · Claimed by Mallox · listed 3 years ago

37m

Age

since listed · data leaked

Status timeline

ListedJun 28, 2023
Data leakeddate unknown

At a glance

Group: Mallox
Status: Data leaked
Country: United States
Sector: Technology
Listed on leak site: Jun 28, 2023

About the victim

AI dossier — public-source company profile

JBCC Holdings Corporation is a Japanese IT services company headquartered in Tokyo, specialising in systems integration, cloud services, network infrastructure, and IT outsourcing. The company serves a wide range of enterprise clients across Japan and has multiple subsidiaries operating in the IT solutions space. Its clearnet domain jbcc.co.jp confirms its Japanese operations, despite the threat actor listing the country as United States.

Industry: IT Services & Systems Integration
Address: 1-7-1 Yokoami, Sumida-ku, Tokyo 130-0015, Japan
Employees: 1001-5000
Founded: 1966

Attack summary

Severity: high — Data has been confirmed as published (four exfiltrated archive parts released publicly), indicating successful exfiltration of internal company data from a mid-to-large IT services firm; the exact data contents are unverified but the scale and publication status elevate severity to high.

The Mallox ransomware group claims to have exfiltrated data from JBCC Corp, publishing four multi-part compressed archive files (CISDOM.7z.001–.004) with a shared password via AnonFiles, indicating confirmed data exfiltration and publication.

high

Data the group says was taken

AI dossier — extracted from the leak post

Compressed archive files (CISDOM.7z multi-part)
Corporate/internal documents (contents unspecified)
Potentially client or business records

The group's post references roughly 4 proof files.

What the group claims

INFO: https://www.zoominfo.com/c/jbcc/431568723 DATA: CISDOM.7z.004: https://anonfiles.com/3eH2a3zez6/CISDOM_7z_004 CISDOM.7z.003: https://anonfiles.com/KfH1a5z6ze/CISDOM_7z_003 CISDOM.7z.002: https://anonfiles.com/MfHca7zfzd/CISDOM_7z_002 CISDOM.7z.001: https://anonfiles.com/FeH5aaz7z5/CISDOM_7z_001 Password: &q.&i_R327:3p1<dBtEK~L02HT(4C3JZ

Sources

Victim sitejbcc.co.jp
Leak posthttp://wtyafjyhwqrgo4a45wdvvwhen3cx4euie73qvlhkhvlrexljoyuklaad.onion/mallox/post?g5XpAzXBlTCBjPr

Source

Indexed 3 years ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.

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Disclosure context

About Mallox

**Overview:** Mallox is a financially motivated ransomware group that emerged in November 2022, operating as a relatively new player in the ransomware ecosystem with a focus on extracting monetary payments from victim organizations across multiple industry sectors. **Origin & Affiliation:** The group's country of origin and specific affiliations remain largely undocumented by major threat intelligence organizations, though their operational patterns suggest they operate independently rather than as part of a larger ransomware-as-a-service operation. **Attack Methodology:** Limited public documentation exists regarding Mallox's specific attack vectors and technical capabilities, though their successful compromise of 49 documented victims suggests they employ conventional ransomware deployment methods including data encryption and likely extortion tactics to pressure victims into payment. **Notable Campaigns:** Mallox has demonstrated a preference for targeting technology companies, business services, and manufacturing sectors, with their operations showing particular concentration in the United Kingdom, India, and the United States, though specific high-profile incidents have not been widely publicized by major cybersecurity firms or law enforcement agencies. **Current Status:** The group remains active as of recent threat intelligence reporting, continuing to conduct ransomware operations across their preferred geographic and sectoral targets. The group has been linked to 49 public disclosures across our corpus. First observed on a leak site on November 4, 2022; most recent post July 15, 2024. The operation is currently inactive.

Timeline of this disclosure

June 28, 2023JBCC Corp listed by Malloxon the group's public leak site

Other recent disclosures by Mallox

Mallox has been linked to 49 public victims on Darkfield. A sample of the most recent:

See the full Mallox dossier →

Sector and geography

This disclosure adds to ransomware activity in the Technology sector, which has 3,549 disclosures indexed across all operators we track. Geographically, JBCC Corp is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Mallox means JBCC Corp appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.

Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
Report the incident to your national CERT, CISA (United States), as required for your jurisdiction.
Monitor for the data appearing on Mallox's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.

How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.