Was Sando Tech hit by ransomware?

Sando Tech was listed by the thegentlemen 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 thegentlemen ransomware group?

thegentlemen 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 Sando Tech breach?

thegentlemen published data attributed to Sando Tech. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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SANDO TECH, Inc.

listed as Sando Tech · Claimed by Thegentlemen · listed 4 months ago

Age

since listed · data leaked

Status timeline

ListedFeb 26, 2026
Data leakeddate unknown

At a glance

Group: Thegentlemen
Status: Data leaked
Country: United States
Listed on leak site: Feb 26, 2026

About the victim

AI dossier — public-source company profile

SANDO TECH, Inc. (株式会社) is a Japanese manufacturer engaged in the development, design, manufacturing, and sale of machinery, with a focus on testing equipment. The company is headquartered in Wakayama City, Wakayama Prefecture, Japan, and also offers improvement, repair, and consumable parts services for its equipment.

Industry: Industrial Machinery & Testing Equipment Manufacturing
Address: 〒641-0043 和歌山県和歌山市宇須4丁目4番5号 (4-4-5 Usu, Wakayama City, Wakayama Prefecture 641-0043, Japan)

Attack summary

Severity: medium — Status is 'data_published' indicating the group claims to have released data, but the leak post was inaccessible (bot-check wall) so no proof files, data categories, or exfiltration scope can be confirmed. Medium is appropriate given a claimed publication with no verifiable evidence of regulated or sensitive data.

The group 'thegentlemen' claims a data publication against SANDO TECH, Inc.; however, the leak post content was blocked by a bot-verification page and yields no specific details about encryption, exfiltration, or the nature of data at stake.

medium

What the group claims

sando.co.jp datanyze.com/companies/sando-tech/539005226 SANDO TECH, Inc. specializes in the development, design, manufacturing, and sales of machinery. The company offers a range of products including testing machines, repair services, and consumable parts orders. Their intended clients include businesses in need of high-performance machinery solutions

The leak post

captured from the group's site

Gentlecloud Protection 🛡️ Gentlecloud Verifying your browser... Initializing security checks... I'm not a bot

Sources

Victim sitesando.co.jp
Leak posthttp://tezwsse5czllksjb7cwp65rvnk4oobmzti2znn42i43bjdfd2prqqkad.onion

Source

Indexed 4 months 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 thegentlemen

thegentlemen is a ransomware group that emerged in September 2025, operating with apparent financial motivations based on their broad targeting of commercial sectors. The group has documented 267 victims across multiple countries, with primary focus on the United States, Thailand, France, Brazil, and India. Their targeting strategy demonstrates a preference for high-value sectors including manufacturing, technology, healthcare, and financial services organizations. Given the group's recent emergence and limited public documentation from established threat intelligence sources such as CISA, FBI, or major security research firms, specific details regarding their country of origin, operational structure, attack methodologies, encryption techniques, and whether they employ ransomware-as-a-service models remain unclear. The relatively high victim count of 267 in a short operational timeframe since September 2025 suggests either an aggressive campaign pace or potential inflation of victim numbers through affiliate operations, though without corroborating intelligence reports, the group's exact operational capabilities and notable campaigns cannot be definitively established. Current intelligence indicates the group remains active as of late 2025, though comprehensive threat profiling requires additional validated reporting from authoritative cybersecurity sources. The group has been linked to 483 public disclosures across our corpus. First observed on a leak site on September 9, 2025; most recent post June 11, 2026. The operation is currently active.

Also tracked as: the gentlemen.

Timeline of this disclosure

February 26, 2026Sando Tech listed by thegentlemenon the group's public leak site

Other recent disclosures by thegentlemen

thegentlemen has been linked to 483 public victims on Darkfield. A sample of the most recent:

See the full thegentlemen dossier →

Sector and geography

Geographically, Sando Tech is reported in United States, a country with 7,392 ransomware disclosures in our corpus.

If your organisation is affected

A listing by thegentlemen means Sando Tech 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.
Monitor for the data appearing on thegentlemen'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.