Was Cisco hit by ransomware?

Cisco was listed by the shinyhunters ransomware operation (United States), and stolen data was published on the group's leak site. Darkfield tracks this disclosure with the original leak post, screenshot and group context.

Who is the shinyhunters ransomware group?

shinyhunters is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

What data was leaked in the Cisco breach?

shinyhunters published data attributed to Cisco. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Cisco

Claimed by Shinyhunters · listed 9 months ago

Age

since listed · data leaked

Status timeline

ListedOct 3, 2025
Data leakeddate unknown

At a glance

Group: Shinyhunters
Status: Data leaked
Country: United States
Sector: Technology
Listed on leak site: Oct 3, 2025

About the victim

AI dossier — public-source company profile

Cisco Systems, Inc. is a multinational technology corporation headquartered in San Jose, California, specializing in networking hardware, software, and high-technology services. Founded in December 1984, Cisco develops and sells products that underpin much of the world's internet infrastructure, including routers, switches, and cybersecurity solutions. It is one of the largest technology companies in the world by revenue and employee count.

Industry: Networking Hardware & IT Infrastructure
Address: 170 West Tasman Drive, San Jose, California 95134, United States
Employees: 80000
Founded: 1984

Attack summary

Severity: high — Cisco is a major global technology and networking infrastructure company; a confirmed data publication by ShinyHunters — a group known for large-scale exfiltration — against such a target implies significant exposure of potentially sensitive business, customer, or internal data, warranting a high severity rating even without detailed inventory information in the post.

ShinyHunters claims to have compromised Cisco and has published data, though the leak post provides no specific description of encryption or exfiltration methods, nor a stated ransom demand or data volume. The disclosure status indicates data has been published.

high

Original description

AI-summarised, not from the leak post

Cisco Systems, Inc. is a multinational company based in San Jose, California. It specializes in developing and selling networking hardware, high-technology services, and products. Founded in December 1984, it has been paving the way for digital innovation primarily in the IT industry. Much of the internet protocols and its infrastructure are driven by Cisco's technological advancements.

Sources

Leak posthttps://breachforums.hn//cisco.html

Source

Indexed 9 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 shinyhunters

Based on the limited publicly available information, shinyhunters appears to be a recently emerged ransomware group first observed in October 2025, primarily motivated by financial gain through extortion activities targeting organizations across multiple sectors. The group's origin and potential affiliations remain unclear due to their recent emergence, and there is insufficient public documentation to determine whether they operate as a Ransomware-as-a-Service model or as an independent entity. Their attack methodology and specific technical capabilities have not been extensively documented by major threat intelligence firms, though their targeting pattern suggests a broad opportunistic approach rather than sector-specific specialization. The group has reportedly victimized approximately 77 organizations, with primary targeting focused on the United States, France, Japan, Germany, and Australia, showing particular interest in consumer services, technology, financial services, transportation and logistics, and education sectors. Given the group's very recent emergence in late 2025, there are no widely reported major campaigns or high-profile incidents documented by established security research organizations, and no known law enforcement actions have been publicly reported against this group. The current operational status of shinyhunters remains active based on available reporting, though comprehensive threat intelligence profiles from major security firms like Mandiant, CrowdStrike, or government agencies have not yet been published due to the group's recent appearance in the threat landscape. The group has been linked to 139 public disclosures across our corpus. First observed on a leak site on October 3, 2025; most recent post July 15, 2026. The operation is currently active.

Timeline of this disclosure

October 3, 2025Cisco listed by shinyhunterson the group's public leak site

Other recent disclosures by shinyhunters

shinyhunters has been linked to 139 public victims on Darkfield. A sample of the most recent:

See the full shinyhunters 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, Cisco is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by shinyhunters means Cisco 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 shinyhunters'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.