Was Bater hit by ransomware?

Bater was listed by the thegentlemen ransomware operation (Poland), 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 Bater breach?

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

Ransomware victim disclosure

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Bater Sp. z o.o.

listed as Bater · Claimed by Thegentlemen · listed 4 hours ago

Today

Age

since listed · data leaked

Status timeline

ListedJul 31, 2026
Data leakeddate unknown

At a glance

Group: Thegentlemen
Status: Data leaked
Country: Poland
Listed on leak site: Jul 31, 2026

About the victim

AI dossier — public-source company profile

Bater Sp. z o.o. is a Polish manufacturer of traction and stationary batteries founded in 1990, with production facilities in Warsaw and Gliwice. The company specializes in lead-acid and lithium-ion battery systems for electric forklifts, reserve/backup power, renewable energy applications, and recombination plugs, supported by comprehensive nationwide maintenance, assembly, and recycling services. ISO 9001 and ISO 14001 certified.

Industry: Industrial Battery Manufacturing & Services
Address: Warsaw and Gliwice, Poland (dual production facilities); contact: +48 22 664 87 87
Founded: 1990

Attack summary

Severity: low — The leak post is a listing/announcement with no proof files, screenshots, or specific data inventory disclosed. No operational disruption is stated. Without evidence of exfiltration or encryption impact, severity cannot be elevated.

The ransomware group 'thegentlemen' claims to have compromised Bater. No specific attack method (encryption, exfiltration, or both) or data inventory is detailed in the truncated leak post provided.

low

What the group claims

bater.pl zoominfo.com/c/bater-ltd/429692403 Bater is a leading Polish manufacturer of traction and stationary batteries, founded in 1990 with production facilities in Warsaw and Gliwice. The company specializes in producing high-quality battery systems for electric forklifts, reserve power, and renewable energy applications, along with recombination plugs and protective battery racks. Holding ISO 9001 and ISO 14001 certifications, Bater also provides comprehensive nationwide services, including battery assembly, maintenance, room renovation, and recycling

Sources

Victim sitebater.pl

Source

Indexed 4 hours 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 696 public disclosures across our corpus. First observed on a leak site on September 9, 2025; most recent post July 31, 2026. The operation is currently active.

Also tracked as: the gentlemen.

Timeline of this disclosure

July 31, 2026Bater listed by thegentlemenon the group's public leak site

Other recent disclosures by thegentlemen

thegentlemen has been linked to 696 public victims on Darkfield. A sample of the most recent:

See the full thegentlemen dossier →

Sector and geography

Geographically, Bater is reported in Poland, a country with 21 ransomware disclosures in our corpus.

If your organisation is affected

A listing by thegentlemen means Bater 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, CERT Polska (Poland), as required for your jurisdiction.
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.