Disclosure context

About Nokoyawa

Nokoyawa is a ransomware group that emerged in December 2022, operating with primarily financial motivations and targeting organizations across multiple sectors including healthcare, non-profit, education, finance, and energy. The group has claimed at least 36 victims since its emergence, with attacks predominantly focused on the United States, Canada, United Kingdom, France, and the Philippines. While detailed technical analysis of Nokoyawa's operations remains limited in public reporting, the group appears to follow conventional ransomware tactics targeting critical infrastructure and essential services sectors. Their targeting of healthcare and educational institutions suggests they operate without the sector restrictions that some other ransomware groups have adopted. Notable campaigns include attacks across their preferred geographic regions, though specific high-profile incidents have not been extensively documented in public threat intelligence reporting from major security firms. As of current reporting, Nokoyawa appears to remain an active threat, though the group's relatively recent emergence means long-term operational patterns and potential law enforcement disruption efforts are still developing. The group has been linked to 36 public disclosures across our corpus. First observed on a leak site on December 9, 2022; most recent post October 8, 2023. The operation is currently inactive.

Timeline of this disclosure

July 29, 2023AT&S listed by Nokoyawaon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Business Services sector, which has 2,640 disclosures indexed across all operators we track. Geographically, AT&S is reported in Singapore, a country with 22 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

AT&S (AquaTerra & SSH)

listed as AT&S · Claimed by Nokoyawa · listed 3 years ago

34m

Age

since listed · data leaked

Status timeline

Listed
Jul 29, 2023
Data leaked

At a glance

Group: Nokoyawa
Status: Data leaked
Country: Singapore
Sector: Business Services
Listed on leak site: Jul 29, 2023

About the victim

AI dossier — public-source company profile

AT&S was incorporated in Singapore in 2009 as a merger of AquaTerra and SSH, formed to provide a full spectrum of products and services to the Oil & Gas and Marine sectors. It is described as the only Singapore-based company of its kind and one of the largest in its segment. The company operates under the Ame Group brand (atssh.com).

Industry: Oil & Gas and Marine Services
Address: Singapore
Founded: 2009

Attack summary

Severity: high — Data has been confirmed published by the threat actor, indicating successful exfiltration of business data from a company operating in the Oil & Gas and Marine sectors, which may include commercially sensitive operational and contractual information.

The Nokoyawa ransomware group claims to have attacked AT&S and has published data (disclosed status: data_published), though the leak post does not specify whether encryption, exfiltration, or both occurred, and no ransom amount or data size is stated.

high

Data the group says was taken

AI dossier — extracted from the leak post

Company internal data

What the group claims

AT&S was incorporated in Singapore in 2009 with the goal to provide the entire spectrum of products and services to the Oil & Gas and Marine sectors, bringing AquaTerra and SSH together in a synergistic manner. At formation, we became the only Singapore-based company and one of the largest in the...

Sources

Victim siteatssh.com
Leak posthttp://nokoleakb76znymx443veg4n6fytx6spck6pc7nkr4dvfuygpub6jsid.onion/leak/64c53da6f6451b16e0581304

Source

Indexed 3 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.