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AECOM

listed as aecom.com · Claimed by BrainCipher · listed 6 hours ago

Today
Age
since listed · data leaked

Status timeline

  1. ListedSep 17, 2026
  2. Data leakeddate unknown

At a glance

Group
BrainCipher
Status
Data leaked
Country
United States
Sector
Professional Services
Listed on leak site
Sep 17, 2026

About the victim

AI dossier — public-source company profile

AECOM is a global infrastructure consulting and engineering firm that partners with clients across markets including cities, energy, transportation, water, healthcare, and government. They provide advisory, architecture & design, construction management, engineering, environmental, and program management services. The company operates offices worldwide and describes itself as 'the world's trusted infrastructure consulting firm.'

Industry
Infrastructure Consulting & Engineering

Attack summary

Severity: high — Confirmed exfiltration of a large dataset (670 GB) from a major Fortune 500 infrastructure consulting firm; infrastructure sector is critical to national security and public welfare. No specific sensitive data types disclosed yet, but the volume and sector suggest significant business/operational data at minimum.

BrainCipher claims to have obtained 670 GB of data from AECOM (described as likely belonging to a Fortune 500 company) with a ransom deadline of September 25, 2026. No specific details about the nature of the exfiltrated data are provided in the post.

high

Original description

AI-summarised, not from the leak post

AECOM is a global infrastructure and engineering firm headquartered in the United States. The company provides design, consulting, construction, and management services across sectors including transportation, water, environment, energy, and government facilities. Operating in over 150 countries, AECOM serves public and private clients worldwide and is recognized as one of the largest engineering services firms globally.

The leak post

captured from the group's site
We've obtained 670 GB of data that most likely belongs to a Fortune 500 company. Stay tuned for more details — it's going to be interesting. If you think you are here by mistake, please contact us at [email protected]
⏳ Deadline: September 25, 2026 at 15:00

Sources

Source

Indexed 6 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 Braincipher

Braincipher is a recently emerged ransomware group that was first observed in July 2024, operating with apparent financial motivations and targeting organizations primarily across North America and Europe. The group's origin and potential affiliations remain largely undocumented by major threat intelligence organizations, though their targeting patterns suggest a broad opportunistic approach rather than nation-state backing, likely operating as an independent entity rather than through established ransomware-as-a-service infrastructure. Their attack methodology and specific technical capabilities have not been extensively documented by CISA, FBI, or major security research firms, though their victim distribution across 44 confirmed targets spanning business services, manufacturing, technology, and healthcare sectors indicates a generalist approach to target selection rather than sector-specific expertise. No major high-profile campaigns or significant law enforcement actions have been publicly documented against this group by reputable sources, suggesting either a relatively low-impact operational scale or insufficient intelligence collection on their activities. As of current reporting, the group's operational status remains unclear due to limited public documentation from established threat intelligence sources. The group has been linked to 81 public disclosures across our corpus. First observed on a leak site on July 1, 2024; most recent post September 17, 2026. The operation is currently active.

Also tracked as: brain cipher.

Timeline of this disclosure

  • September 17, 2026aecom.com listed by Braincipher on the group's public leak site

Other recent disclosures by Braincipher

Braincipher has been linked to 81 public victims on Darkfield. A sample of the most recent:

See the full Braincipher dossier →

Sector and geography

This disclosure adds to ransomware activity in the Professional Services sector, which has 17 disclosures indexed across all operators we track. Geographically, aecom.com is reported in United States, a country with 3,165 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Braincipher means aecom.com 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 Braincipher'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.