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sermo.com

Claimed by Blackbasta · listed 2 years ago

28m
Age
since listed · data leaked

Status timeline

  1. ListedApr 9, 2024
  2. Data leakeddate unknown

At a glance

Group
Blackbasta
Status
Data leaked
Country
United States
Sector
Healthcare
Listed on leak site
Apr 9, 2024

About the victim

AI dossier — public-source company profile

Sermo is a global physician-first social networking platform and community for licensed healthcare professionals. It connects over 1.3 million healthcare professionals (primarily physicians) across 150 countries, enabling peer communication, paid medical surveys, drug ratings, case consultations, and continuing medical education. The platform generated over $25 million in physician survey compensation in the preceding year.

Industry
Healthcare Technology & Physician Networking
Address
200 Park Ave S, New York City, New York, 10003, United States

Attack summary

Severity: critical — Exfiltration of ~700 GB including confirmed personal data at scale (1.3M+ users), patient data, and financial records from a healthcare platform. Data involves regulated PII and healthcare information subject to HIPAA and international medical privacy regulations.

Black Basta claims to have exfiltrated approximately 700 GB of data from Sermo, including personal data, departmental records, financial information, project files, and patient data.

critical

Data the group says was taken

AI dossier — extracted from the leak post
  • Personal data (physician profiles)
  • Departmental data
  • Financial records
  • Project files
  • Patient data information

What the group claims

Sermo Engaging with more than 1.3 million HCPs across 150 countries, we offer a unique physician-first online community that allows clinicians to communicate about issues that are important to them and their patients. Doctors can access our global community and the many benefits here.SITE: www.sermo.com Address : 200 Park Ave S, New York City, New York, 10003 United States Tel# (212) 358-0800ALL DATA SIZE: ~700gb 1. Personal data 2. Departments data 3. Finance 4. Projects, patient data infos & etc…

Sources

Source

Indexed 2 years 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 blackbasta

Black Basta is a highly sophisticated ransomware group that emerged in April 2022 and operates with a primary motivation of financial extortion, having rapidly established itself as one of the most prolific ransomware operations of the modern era with over 500 confirmed victims globally. The group is widely assessed by researchers including Mandiant and CISA to have likely ties to former members of the Conti ransomware syndicate following that group's dissolution in mid-2022, and operates as a private Ransomware-as-a-Service (RaaS) model with a closed affiliate structure rather than open recruitment, with suspected links to the FIN7 threat actor cluster based on observed tooling overlaps documented by SentinelOne and Microsoft. Black Basta employs a double extortion methodology, exfiltrating sensitive victim data prior to encryption and threatening publication on their Tor-based leak site "Basta News" to compound pressure on victims; initial access is predominantly achieved through phishing campaigns, purchase of stolen credentials, and exploitation of known vulnerabilities including QakBot malware distribution, with the group subsequently deploying tools such as Cobalt Strike, SystemBC, and their custom encryptor targeting both Windows and VMware ESXi environments using a ChaCha20 encryption algorithm. Per CISA and FBI joint advisory AA24-131A published in May 2024, the group has struck over 500 organizations across North America, Europe, and Australia, with high-profile victims including Ascension Health, Capita, the American Dental Association, and Rheinmetall, demonstrating a clear preference for manufacturing, business services, technology, transportation, and food production sectors across the United States, United Kingdom, Germany, Canada, and Italy. As of the time of available public reporting, Black Basta remained operationally active, though internal chat logs leaked in early 2025 revealed significant internal tensions and potential organizational fragmentation that security researchers assessed could impact the group's near-term operational cohesion. The group has been linked to 523 public disclosures across our corpus. First observed on a leak site on April 26, 2022; most recent post January 11, 2025. The operation is currently inactive.

Timeline of this disclosure

  • April 9, 2024sermo.com listed by blackbastaon the group's public leak site

Other recent disclosures by blackbasta

blackbasta has been linked to 523 public victims on Darkfield. A sample of the most recent:

See the full blackbasta dossier →

Sector and geography

This disclosure adds to ransomware activity in the Healthcare sector, which has 2,603 disclosures indexed across all operators we track. Geographically, sermo.com is reported in United States, a country with 3,138 ransomware disclosures in our corpus.

If your organisation is affected

A listing by blackbasta means sermo.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 blackbasta'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.