Was cisin.com hit by ransomware?

cisin.com was listed by the J ransomware operation (India), 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 J ransomware group?

J 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 cisin.com breach?

J published data attributed to cisin.com. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Cyber Infrastructure Pvt. Ltd.

listed as cisin.com · Claimed by J · listed 1 year ago

12m

Age

since listed · data leaked

Status timeline

ListedJun 20, 2025
Data leakeddate unknown

At a glance

Group: J
Status: Data leaked
Country: India
Sector: Technology
Listed on leak site: Jun 20, 2025

About the victim

AI dossier — public-source company profile

Cyber Infrastructure Pvt. Ltd. (CIS) is an IT service provider headquartered in India with global offices, specializing in custom software development, mobile app development, AI, cloud solutions, blockchain, and other digital transformation services. The company serves startups, SMEs, and large enterprises, operating with 1000+ employees and a track record of 5000+ completed projects.

Industry: IT Services & Software Development
Employees: 1000

Attack summary

Severity: medium — Data has been published (disclosed status confirms this), but no specific proof files are advertised in the excerpt, no details on data sensitivity or scale are provided, and no operational disruption is mentioned. The company handles client projects and business operations, suggesting moderate sensitivity.

The ransomware group claims to have targeted CIS. The leak post indicates data has been published, though specific details about encryption status or exfiltration scope are not provided in the excerpt.

medium

Data the group says was taken

AI dossier — extracted from the leak post

business data
client information
project details

Original description

AI-summarised, not from the leak post

Cyber Infrastructure Pvt. Ltd. (CIS), known as cisin.com, is an IT service provider company that develops and delivers customized solutions in software development, mobile app development, AI, and cloud solutions. With the help of its 1000+ experts, CIS offers a unique blend of offshore and onshore client engagement models for startups, SMEs, and large enterprises worldwide. It is headquartered in India with multiple global offices.

Sources

Source

Indexed 1 year 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 J

The J ransomware group is a newly emerged threat actor first observed in May 2025, operating with apparent financial motivations based on their targeting patterns across multiple countries and sectors. With limited public documentation available from established security research organizations, the group has demonstrated rapid operational capability by compromising 41 known victims within their initial months of activity. Their targeting strategy appears opportunistic, focusing primarily on organizations in the United States, United Kingdom, France, Argentina, and Germany, with a particular emphasis on technology companies, manufacturing firms, construction businesses, and business services providers. The diversity of their geographic and sectoral targeting suggests either a broad-spectrum approach to victim selection or potential use of automated tools for initial compromise identification. Given the recent emergence of this group and limited reporting from major cybersecurity firms and law enforcement agencies, specific details regarding their technical methodologies, ransom demands, data exfiltration practices, or organizational structure remain undocumented in publicly available threat intelligence. The group remains active as of current reporting periods, though their relative obscurity in established threat intelligence databases suggests they may be operating at a smaller scale compared to more prominent ransomware-as-a-service operations. The group has been linked to 41 public disclosures across our corpus. First observed on a leak site on May 2, 2025; most recent post November 9, 2025. The operation is currently inactive.

Timeline of this disclosure

June 20, 2025cisin.com listed by Jon the group's public leak site

Other recent disclosures by J

J has been linked to 41 public victims on Darkfield. A sample of the most recent:

See the full J 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, cisin.com is reported in India, a country with 381 ransomware disclosures in our corpus.

If your organisation is affected

A listing by J means cisin.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, CERT-In (India), as required for your jurisdiction.
Monitor for the data appearing on J'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.