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YYC Advisors

Claimed by HYFLOCK · listed 4 hours ago

Today
Age
since listed · data leaked

Status timeline

  1. ListedOct 13, 2026
  2. Data leakeddate unknown

At a glance

Group
HYFLOCK
Status
Data leaked
Country
Canada
Sector
Financial Services
Listed on leak site
Oct 13, 2026

About the victim

AI dossier — public-source company profile

YYC Advisors is a leading Malaysian accounting and professional services firm established in 1974, serving over 20,000 clients across Malaysia, Singapore, and Hong Kong. The firm provides tax compliance, audit, business advisory, corporate services, and digital software solutions, with particular focus on SMEs and cross-border expansion.

Industry
Accounting & Professional Services
Address
No.32 & 34, Lorong Thambi 2, off Jalan Brunei, 55100 Kuala Lumpur, Malaysia
Employees
1100+
Founded
1974

Attack summary

Severity: critical — Confirmed exfiltration of 300GB (6GB published as proof) from an accounting firm handling sensitive financial, tax, and business data for 20,000+ clients. Exposure includes PII, financial records, tax information, and confidential business documents at significant scale.

HYFLOCK claims to have exfiltrated 300GB of data from YYC Advisors, with 6GB presented as proof. The group has not disclosed specific ransom demands in this post.

critical

Data the group says was taken

AI dossier — extracted from the leak post
  • Tax records and compliance documentation
  • Client financial statements and audit files
  • Corporate advisory engagement records
  • Personal and corporate tax data
  • Client business information and M&A files
  • Payroll and HR records

The group's post references roughly 6GB of 300GB claimed proof files.

What the group claims

YYC Advisors (YYC Group) is a long-established local accounting and comprehensive business consulting group in Malaysia, focusing on a "one-stop" service for tax + audit + business advisory. It mainly serves SMEs and growing companies and also deals with cross-border expansion, M&A succession, and digital software. 1. Basic Overview Founded: 1974, by Yap Seong Fatt, starting from a single table in Pudu, Kuala Lumpur Headquarters: No.32 & 34, Lorong Thambi 2, off Jalan Brunei, 55100 Kuala Lumpur, Malaysia; Phone: +603‑9078‑2868 Size: According to the official site, 1,100+ employees, serving 20,000+ clients, conducted 7,000+ training sessions; offices cover major Malaysian cities like Kuala Lumpur, Selangor, Penang, Johor Bahru, as well as Singapore, and some sources mention Hong Kong Position: One of the top ten local accounting firms in Malaysia, with a focus on the SME market Capital background: In 2019, OCBC Bank invested in its non-audit business; later, it reached a strategic investment/growth partnership with Singapore's SeaTown Private Capital for professional services M&A expansion in Southeast Asia Website: yycadvisors.com 2. Core Services (by line) Tax: Corporate/personal tax compliance and planning, SST, transfer pricing, tax audits and investigation responses, Malaysia e-invoicing (MyInvois/e-Invoice) implementation Audit & Accounting: YYC & Co PLT licensed audit; outsourced bookkeeping, cloud accounting (Xero, etc.), financial statements, payroll outsourcing Corporate & Business Advisory: Company registration/company secretary, M&A, deal structuring, financial due diligence, business valuation, IPO support, internal audit, market research, business succession Digital Software: emplX (HR/payroll cloud), Smart New Retail (retail/F&B POS), cloud ERP related Training & Membership: Winning Strategy Academy, taxPOD (tax subscription/live streaming/micro-courses), for business owners and finance professionals ...,We've handled a total of 300GB of data, and here we show 6GB as proof. For the rest of the data, please explain your purpose and DM us to discuss

The leak post

captured from the group's site
YYC Advisors (YYC Group) is a long-established local accounting and comprehensive business consulting group in Malaysia, focusing on a "one-stop" service for tax + audit + business advisory. It mainly serves SMEs and growing companies and also deals with cross-border expansion, M&A succession, and digital software. 1. Basic Overview Founded: 1974, by Yap Seong Fatt, starting from a single table in Pudu, Kuala Lumpur Headquarters: No.32 & 34, Lorong Thambi 2, off Jalan Brunei, 55100 Kuala Lumpur, Malaysia; Phone: +603‑9078‑2868 Size: According to the official site, 1,100+ employees, serving 20,000+ clients, conducted 7,000+ training sessions; offices cover major Malaysian cities like Kuala Lumpur, Selangor, Penang, Johor Bahru, as well as Singapore, and some sources mention Hong Kong Position: One of the top ten local accounting firms in Malaysia, with a focus on the SME market Capital background: In 2019, OCBC Bank invested in its non-audit business; later, it reached a strategic investment/growth partnership with Singapore's SeaTown Private Capital for professional services M&A expansion in Southeast Asia Website: yycadvisors.com 2. Core Services (by line) Tax: Corporate/personal …

Sources

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 HYFLOCK

HYFLOCK is a ransomware group first observed in October 2026 with an apparent primary motivation of financial gain, representing an emerging threat actor with a limited but notable operational footprint of eight confirmed victims across multiple continents. The group's geographic targeting pattern spans Brazil, Canada, India, Nigeria, and Saudi Arabia, suggesting a deliberate focus on economically significant nations across South America, South Asia, Africa, and the Middle East rather than a regionally constrained operational posture. HYFLOCK has demonstrated a cross-sector targeting approach, with confirmed victims in Technology, Financial Services, and Government and Defense verticals, indicating opportunistic selection rather than strict industry specialization. Given the group's recent emergence and limited public documentation by major threat intelligence organizations such as CISA, the FBI, or Mandiant at the time of this profile, definitive attribution regarding country of origin, RaaS affiliation, specific tooling, or initial access vectors has not been publicly established. The breadth of targeted countries across multiple regions with no clear geographic concentration, combined with the inclusion of government and defense entities alongside private sector victims, warrants close monitoring as the group's tactics, techniques, and procedures become better documented through continued incident response activity. HYFLOCK should be considered an active and emerging threat, and organizations in the identified target sectors and geographies are advised to maintain heightened defensive posture pending further intelligence development. The group has been linked to 8 public disclosures across our corpus. First observed on a leak site on October 13, 2026. The operation is currently active.

Timeline of this disclosure

  • October 13, 2026YYC Advisors listed by HYFLOCK on the group's public leak site

Other recent disclosures by HYFLOCK

HYFLOCK has been linked to 8 public victims on Darkfield. A sample of the most recent:

See the full HYFLOCK dossier →

Sector and geography

This disclosure adds to ransomware activity in the Financial Services sector, which has 1,197 disclosures indexed across all operators we track. Geographically, YYC Advisors is reported in Canada, a country with 321 ransomware disclosures in our corpus.

If your organisation is affected

A listing by HYFLOCK means YYC Advisors 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, CCCS (Canada), as required for your jurisdiction.
  • Monitor for the data appearing on HYFLOCK'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.