Was TPA Group (.sk) hit by ransomware?

TPA Group (.sk) was listed by the TEAM UNDERGROUND ransomware operation (Slovakia) as a victim being extorted; data had not been published at the time of listing. Darkfield tracks this disclosure with the original leak post, screenshot and group context.

Who is the TEAM UNDERGROUND ransomware group?

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

Ransomware victim disclosure

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TPA Group Slovakia (TPA Slovensko)

listed as TPA Group (.sk) · Claimed by TEAM UNDERGROUND · listed 2 months ago

$15 million

Ransom

demanded

55d

Age

since listed · listed for ransom

Status timeline

ListedMay 21, 2026

Current state: Listed for ransom

At a glance

Group: TEAM UNDERGROUND
Status: Listed for ransom
Country: Slovakia
Sector: Consulting
Listed on leak site: May 21, 2026
Ransom demanded: $15 million

About the victim

AI dossier — public-source company profile

TPA Group Slovakia is a professional services and accounting firm operating under the Baker Tilly International network. The company provides tax, advisory, and consulting services across multiple sectors in Slovakia.

Industry: Professional Services & Accounting

Attack summary

Severity: high — Professional services firms typically hold sensitive financial, tax, and business data for clients across multiple sectors. The $15 million ransom demand and cross-domain listing (tpa-group.com reference) suggest significant data exfiltration, though no proof files are cited in the truncated post.

TEAM UNDERGROUND claims to have compromised TPA Group Slovakia and is demanding $15 million ransom. The group's post references both tpa-group.com ($281 million) and tpa-group.sk ($15 million), suggesting potential exfiltration of business and client data.

high

Data the group says was taken

AI dossier — extracted from the leak post

Client financial records
Tax documentation
Business correspondence
Consulting files

The leak post

captured from the group's site

tpa-group.com $281 million; tpa-group.sk $15 million

Sources

Victim sitetpa-group.sk
Leak posthttp://47glxkuxyayqrvugfumgsblrdagvrah7gttfscgzn56eyss5wg3uvmqd.onion

Source

Indexed 2 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 TEAM UNDERGROUND

TEAM UNDERGROUND is a ransomware group first observed in May 2026 with an apparent financial motivation, though its limited operational history makes comprehensive attribution difficult at this time. With only a single known victim recorded to date, the group has demonstrated a targeting preference for the Audit, Tax Advisory, and Legal Services sector, suggesting a deliberate focus on organizations that handle sensitive financial, legal, and confidential client data — a common strategic choice among financially motivated threat actors seeking high-value exfiltration leverage. Given the group's extremely recent emergence and minimal operational footprint, detailed technical indicators regarding their initial access vectors, tooling, encryption methodology, or affiliation with broader ransomware ecosystems have not yet been publicly documented by authoritative sources such as CISA, the FBI, Mandiant, or equivalent research bodies. No confirmed affiliations with known ransomware-as-a-service platforms or established threat actor groups have been publicly established, nor have any notable high-profile campaigns, law enforcement actions, or ransom figures been attributed to this group in open-source reporting. TEAM UNDERGROUND should currently be regarded as an emerging and closely monitored threat, with its full capabilities, infrastructure, and operational scope remaining largely uncharacterized pending further observed activity and independent security research. The group has been linked to 7 public disclosures across our corpus. First observed on a leak site on May 14, 2026; most recent post June 2, 2026. The operation is currently active.

Timeline of this disclosure

May 21, 2026TPA Group (.sk) listed by TEAM UNDERGROUNDon the group's public leak site

Ransom demanded: $15 million

Other recent disclosures by TEAM UNDERGROUND

TEAM UNDERGROUND has been linked to 7 public victims on Darkfield. A sample of the most recent:

See the full TEAM UNDERGROUND dossier →

Sector and geography

This disclosure adds to ransomware activity in the Consulting sector, which has 67 disclosures indexed across all operators we track. Geographically, TPA Group (.sk) is reported in Slovakia, a country with 4 ransomware disclosures in our corpus.

If your organisation is affected

A listing by TEAM UNDERGROUND means TPA Group (.sk) appeared on a ransomware extortion site and is being pressured to pay before any publication. 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 TEAM UNDERGROUND'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.