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TPA Group (Slovakia)

listed as tpa-group.sk · Claimed by Underground · listed 2 years ago

$281M
Ransom
demanded
26m
Age
since listed · data leaked

Status timeline

  1. ListedMay 1, 2024
  2. Data leakeddate unknown

At a glance

Group
Underground
Status
Data leaked
Country
Slovakia
Sector
Business Services
Listed on leak site
May 1, 2024
Ransom demanded
$281M

About the victim

AI dossier — public-source company profile

TPA Group is a professional services firm offering tax, accounting, and advisory services. The Slovakia subsidiary (tpa-group.sk) is part of TPA Group Baker Tilly International, a larger global network. The Slovak entity generated approximately $15M in revenue.

Industry
Professional Services & Accounting

Attack summary

Severity: high — Confirmed exfiltration of financial and business data from a professional services firm. Professional service firms typically hold client PII, tax records, and sensitive business information. The scale ($281M parent revenue) and nature of the data suggest significant exposure, though the post does not explicitly confirm proof files.

The Underground group claims to have exfiltrated data from TPA Group's operations. The post references revenue figures for both the global parent ($281M) and Slovak subsidiary ($15M), suggesting access to financial records and business intelligence.

high

Data the group says was taken

AI dossier — extracted from the leak post
  • Financial records
  • Revenue data
  • Business intelligence
  • Client information (inferred)

What the group claims

Revenue:tpa-group.com $281M; tpa-group.sk $15M - Country :Slovakia

Sources

Source

Indexed 2 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 Underground

Underground is a relatively new ransomware group that emerged in May 2024, primarily motivated by financial gain through extortion operations targeting organizations across multiple sectors. The group's origin and affiliations remain largely undocumented in public threat intelligence reporting, with no confirmed details about their country of origin or whether they operate as an independent entity or through a Ransomware-as-a-Service model. Based on the limited public information available, Underground has demonstrated a preference for targeting technology, healthcare, business services, manufacturing, and agriculture sectors, with their attacks concentrated primarily in the United States, Canada, South Korea, Germany, and Taiwan. The group's specific attack methodologies, initial access vectors, and technical capabilities have not been extensively documented in publicly available threat intelligence reports from major security firms or government agencies. With only 26 known victims since their emergence in May 2024, Underground represents a smaller-scale operation compared to established ransomware groups, though their cross-sector targeting approach indicates opportunistic victim selection rather than specialized industry focus. Given the recent emergence of this group and limited public reporting, Underground appears to remain active but operates at a relatively low profile compared to more established ransomware families. The group has been linked to 26 public disclosures across our corpus. First observed on a leak site on May 1, 2024; most recent post August 15, 2025. The operation is currently inactive.

Timeline of this disclosure

  • May 1, 2024tpa-group.sk listed by Undergroundon the group's public leak site
Ransom demanded
$281M

Other recent disclosures by Underground

Underground has been linked to 26 public victims on Darkfield. A sample of the most recent:

See the full Underground dossier →

Sector and geography

This disclosure adds to ransomware activity in the Business Services sector, which has 3,796 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 Underground means tpa-group.sk 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 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.