Skip to main content
Darkfield

Ransomware victim disclosure

← All victims

Asahi Kasei Microdevices

listed as AsahiKASEI MICRODEVICES · Claimed by Crypto24 · listed 8 months ago

8m
Age
since listed · data leaked

Status timeline

  1. ListedNov 12, 2025
  2. Data leakeddate unknown

At a glance

Group
Crypto24
Status
Data leaked
Country
United States
Sector
Technology
Listed on leak site
Nov 12, 2025

About the victim

AI dossier — public-source company profile

Asahi Kasei Microdevices (AKM) is a subsidiary of the Asahi Kasei Corporation of Japan, specializing in the design and manufacture of analog, mixed-signal, and digital semiconductor devices including audio DACs/ADCs, magnetic sensors, power management ICs, and other microelectronic components. The company serves global markets including consumer electronics, automotive, and industrial applications. Its products are widely used in high-fidelity audio equipment and automotive sensor systems worldwide.

Industry
Semiconductor & Electronic Components Manufacturing

Attack summary

Severity: high — Data has been published (disclosed status: data_published) by the threat actor against a semiconductor manufacturer with global supply-chain significance; even without explicit inventory details, confirmed data publication for a technology/defense-adjacent electronics company warrants a high severity rating.

The ransomware group crypto24 claims to have attacked Asahi Kasei Microdevices and has disclosed data (status: data_published), though the leak post provides no explicit detail on whether encryption, exfiltration, or both occurred, and no ransom amount or data size is stated.

high

What the group claims

...

Sources

Source

Indexed 8 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.

Is this your supplier? Your competitor? You?

Pro plans monitor your domain, corporate emails, and crypto wallets across every new ransomware leak-site post, breach dump and Telegram callout — alerts within 5 minutes.

Disclosure context

About crypto24

Crypto24 is a recently emerged ransomware group first observed in April 2025, with a primary financial motivation evidenced by their targeting of high-value sectors across multiple geographic regions. The group's origin and affiliations remain unclear due to their recent emergence, though their targeting pattern suggests either independent operations or a new ransomware-as-a-service offering given the diverse geographic spread of their 43 documented victims. Their attack methodology and specific technical capabilities have not yet been thoroughly documented by major threat intelligence providers, though their targeting of technology, financial services, healthcare, and business services sectors indicates they likely employ common initial access vectors such as phishing or exploitation of public-facing applications to gain entry into victim networks. The group has demonstrated a preference for targeting organizations primarily in the United States while also conducting operations across Southeast Asia including Malaysia, Singapore, and Indonesia, as well as extending their reach to Egypt, suggesting either a globally distributed affiliate network or opportunistic targeting based on vulnerable infrastructure discovery. Crypto24 remains active as of the latest available intelligence reporting, though given their recent emergence, comprehensive details about their specific tactics, techniques, and procedures await further analysis by established cybersecurity research organizations. The group has been linked to 49 public disclosures across our corpus. First observed on a leak site on April 8, 2025; most recent post May 18, 2026. The operation is currently active.

Timeline of this disclosure

  • November 12, 2025AsahiKASEI MICRODEVICES listed by crypto24on the group's public leak site

Other recent disclosures by crypto24

crypto24 has been linked to 49 public victims on Darkfield. A sample of the most recent:

See the full crypto24 dossier →

Sector and geography

This disclosure adds to ransomware activity in the Technology sector, which has 3,549 disclosures indexed across all operators we track. Geographically, AsahiKASEI MICRODEVICES is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by crypto24 means AsahiKASEI MICRODEVICES 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, CISA (United States), as required for your jurisdiction.
  • Monitor for the data appearing on crypto24'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.