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Acroamatics

listed as Delta Information Systems · Claimed by Cephalus · listed 11 months ago

10m
Age
since listed · data leaked

Status timeline

  1. ListedAug 29, 2025
  2. Data leakeddate unknown

At a glance

Group
Cephalus
Status
Data leaked
Country
United States
Sector
Technology
Listed on leak site
Aug 29, 2025

About the victim

AI dossier — public-source company profile

Acroamatics (acroamatics.com) appears to be a technology and systems engineering firm operating in the United States, likely serving defense, intelligence, or government sectors based on its domain and association with Delta Information Systems. The victim name 'Delta Information Systems' may refer to a division, subsidiary, or related entity. Specific operational details are unavailable due to absence of public site content.

Industry
Defense & Intelligence Software / Systems Engineering

Attack summary

Severity: critical — Exfiltration of 800+ GB of proprietary software and hardware code from what appears to be a defense/intelligence-adjacent technology firm, with the attacker actively soliciting buyers for the stolen code, represents a critical intellectual property and potential national security exposure.

The group claims to have exfiltrated over 800 GB of internal data including software and hardware source code, and is advertising the stolen code for sale to interested buyers. No encryption claim is explicitly stated; the post focuses on data theft and monetisation.

critical

Data the group says was taken

AI dossier — extracted from the leak post
  • Software source code
  • Hardware code/designs
  • Internal business data (800 GB+)

What the group claims

We have got all the software and hardware code,and got 800G+ of internal data. The link will coming soon... Of if anyone is intersted in purchasing the code,pls contact me

Sources

Source

Indexed 11 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.

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Disclosure context

About cephalus

Based on available public information, Cephalus is a recently emerged ransomware group first observed in August 2025, operating with apparent financial motivations targeting organizations primarily across the United States, United Kingdom, Netherlands, and Ireland. The group has claimed 19 victims since emergence, with no publicly documented country of origin or confirmed affiliations to established ransomware families or RaaS operations by major security researchers or government agencies. Their attack methodology and specific technical capabilities remain largely undocumented in public threat intelligence reporting, though their targeting pattern shows focus on healthcare, business services, financial services, and manufacturing sectors alongside organizations of undetermined industry classification. No major high-profile campaigns, record ransom demands, or law enforcement disruption actions have been publicly reported by CISA, FBI, or established security research firms at this time. The group appears to remain active as of current reporting, though the limited public documentation suggests either highly targeted operations or insufficient analysis coverage by major threat intelligence organizations. The group has been linked to 19 public disclosures across our corpus. First observed on a leak site on August 26, 2025; most recent post August 29, 2025. The operation is currently inactive.

Timeline of this disclosure

  • August 29, 2025Delta Information Systems listed by cephaluson the group's public leak site

Other recent disclosures by cephalus

cephalus has been linked to 19 public victims on Darkfield. A sample of the most recent:

See the full cephalus 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, Delta Information Systems is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by cephalus means Delta Information Systems 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 cephalus'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.