Disclosure context

About apt73

APT73 is a recently emerged ransomware group that began operations in April 2024, with financial motivation as their primary driver based on their targeting patterns across multiple high-value sectors. The group has demonstrated rapid growth in their operational tempo, accumulating 78 documented victims within their first months of activity. Their targeting methodology shows a preference for English-speaking markets and major economies, with the United Kingdom and United States representing their primary focus areas, followed by significant activity in India, Brazil, and France. The group exhibits a clear preference for high-value sectors including business services, technology, financial services, and healthcare organizations, suggesting a calculated approach to victim selection based on potential payment capability and operational impact. Given the group's recent emergence and limited public documentation from major threat intelligence sources, specific details regarding their initial access vectors, tooling, encryption methods, or organizational structure remain largely unconfirmed by authoritative sources such as CISA, FBI, or established security research firms. The group's current operational status appears active based on the timeline of their emergence, though comprehensive analysis of their capabilities and infrastructure requires additional intelligence gathering and documentation by security researchers. The group has been linked to 141 public disclosures across our corpus. First observed on a leak site on April 22, 2024; most recent post April 27, 2026. The operation is currently inactive.

Also tracked as: Eraleign.

Timeline of this disclosure

April 27, 2026aliorbank.pl listed by apt73on the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Financial Services sector, which has 516 disclosures indexed across all operators we track. Geographically, aliorbank.pl is reported in PL, a country with 8 ransomware disclosures in our corpus.

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.

Ransomware victim disclosure

← All victims

Alior Bank

listed as aliorbank.pl · Claimed by apt73 · listed 23 days ago

23d

Age

since listed · data leaked

Status timeline

Listed
Apr 27, 2026
Data leaked

At a glance

Group: apt73
Status: Data leaked
Country: PL
Sector: Financial Services
Listed on leak site: Apr 27, 2026

About the victim

AI dossier — public-source company profile

Alior Bank is a Polish retail and commercial bank headquartered in Warsaw, Poland, offering personal accounts, savings, loans, mortgages, insurance, credit cards, and mobile/internet banking services. It serves individual clients, micro-enterprises, small businesses, and corporate customers, as well as private banking clients. Alior Bank is listed on the Warsaw Stock Exchange and is one of Poland's larger domestic banks.

Industry: Retail & Commercial Banking
Employees: 3000-5000
Founded: 2008

Attack summary

Severity: high — The victim is a regulated financial institution (bank) and the group claims confirmed exfiltration of financial and internal documents with data already published, constituting exposure of potentially sensitive banking data subject to financial regulatory frameworks (e.g., KNF, GDPR). Data volume is small (0.06 GB) which limits scope, but the target's regulated nature elevates severity.

The group APT73 claims to have exfiltrated approximately 0.06 GB of data from Alior Bank, including financial documents and internal documents, with the data reported as published.

high

Data the group says was taken

AI dossier — extracted from the leak post

Financial documents
Internal documents

What the group claims

Polish bank. Financial docs, internal docs. 0,06 GB of data.

Sources

Victim sitealiorbank.pl
Leak posthttp://basherq53eniermxovo3bkduw5qqq5bkqcml3qictfmamgvmzovykyqd.onion/page_company.php?id=97

Source

Indexed 23 days 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.