West Pharmaceutical Services Hit by Disruptive Ransomware Attack

Summary

Pennsylvania pharmaceutical company West Pharmaceutical Services suffered a ransomware attack on May 4 that prompted global system shutdowns and data exfiltration. The company engaged Palo Alto Networks' Unit 42 for incident response and restoration, with core enterprise systems partially recovered but full restoration timeline still unknown. No ransomware group has publicly claimed responsibility, suggesting a potential ransom payment may have occurred.

Full text

Pennsylvania pharma giant West Pharmaceutical Services is scrambling to restore systems impacted by a ransomware attack last week. The incident, the company says in an incident notice, occurred on May 4 and prompted the “proactive shutdown and isolation of affected on-premise infrastructure”. The containment measure disrupted the company’s business operations globally, West Pharmaceutical Services said in a Monday filing with the Securities and Exchange Commission (SEC). Additional incident response measures included restricting access to enterprise systems and activating crisis management protocols, the company says. The pharma giant retained Palo Alto Networks’ Unit 42 threat intelligence and incident response team to aid with containment, system restoration, and incident investigation, and notified law enforcement. “While the company has restored its core enterprise systems, and critical processes for shipping, receiving, and manufacturing have restarted at some sites with restoration of the remaining sites in process, the timeline for a complete restoration has not yet been finalized,” the company says.Advertisement. Scroll to continue reading. West Pharmaceutical Services told the SEC that the attackers exfiltrated data from its systems before deploying file-encrypting ransomware, and that it is investigating the extent of the data affected. While it did not name the ransomware group responsible for the intrusion, the company told the SEC that it “has taken steps intended to mitigate the risk of dissemination of the exfiltrated data,” which implies that it might have negotiated with the attackers. SecurityWeek has not seen any known ransomware groups claiming responsibility for the attack, suggesting that a ransom might have been paid. West Pharmaceutical Services told the SEC that it has yet to determine if the attack has had any material impact on its financial condition and results of operations. The company has not shared details on the type of data that was stolen, whether any personal information was involved, or how many people might have been affected. SecurityWeek has emailed West Pharmaceutical Services for additional information on the matter and will update this article if the company responds. Founded in 1923 and headquartered in Exton, Pennsylvania, West Pharmaceutical Services makes injectable pharmaceutical packaging and delivery systems. Related: Skoda Data Breach Hits Online Shop Customers Related: Ransomware Group Takes Credit for Trellix Hack Related: Iranian APT Intrusion Masquerades as Chaos Ransomware Attack Related: AI Firm Braintrust Prompts API Key Rotation After Data Breach Written By Ionut Arghire Ionut Arghire is an international correspondent for SecurityWeek. More from Ionut Arghire Skoda Data Breach Hits Online Shop CustomersSailPoint Discloses GitHub Repository HackCheckmarx Jenkins AST Plugin Compromised in Supply Chain AttackResurrected ‘Crimenetwork’ Marketplace Taken Down, Administrator ArrestedOver 500 Organizations Hit in Years-Long Phishing CampaignAI Firm Braintrust Prompts API Key Rotation After Data Breach‘PCPJack’ Worm Removes TeamPCP Infections, Steals CredentialsVulnerability in Claude Extension for Chrome Exposes AI Agent to Takeover Latest News Free OnlyFans Lure Used to Spread Cross-Platform CRPx0 MalwareDeal Reached With Hackers to Delete Data Stolen From the Canvas Educational PlatformApple Patches Dozens of Vulnerabilities in macOS, iOSSAP Patches Critical S/4HANA, Commerce VulnerabilitiesClaude Mythos Finds Only One Curl Vulnerability; Experts Divided on What It Really MeansIs the SOC Obsolete, and We Just Haven’t Admitted It Yet?TanStack, Mistral AI, UiPath Hit in Fresh Supply Chain AttackFrame Security Emerges From Stealth With $50M for Awareness and Training Platform Trending Daily Briefing NewsletterSubscribe to the SecurityWeek Email Briefing to stay informed on the latest threats, trends, and technology, along with insightful columns from industry experts. Webinar: ROSI for CPS Security Programs May 13, 2026 In cyber-physical systems (CPS), just one hour of downtime can outweigh an entire annual security budget. Learn how to master the Return on Security Investment (ROSI) to align security goals with the bottom-line priorities. Register Virtual Event: Threat Detection and Incident Response Summit May 20, 2026 Delve into big-picture strategies to reduce attack surfaces, improve patch management, conduct post-incident forensics, and tools and tricks needed in a modern organization. Register People on the MoveMalwarebytes has named Chung Ip as Chief Financial Officer.Semperis has appointed John Podboy as Chief Information Security Officer.Randy Menon has become Chief Product and Marketing Officer at One Identity.More People On The MoveExpert Insights Is the SOC Obsolete, and We Just Haven’t Admitted It Yet? Many AI-first enterprises have already embraced sovereign architectures for general AI initiatives; cybersecurity—and the SOC—should be next. (Danelle Au) The Mythos Moment: Enterprises Must Fight Agents with Agents Only with the right platform and an agentic, AI-driven defense, will enterprises be able to protect themselves in the agentic era. (Etay Maor) Why Cybersecurity Must Rethink Defense in the Age of Autonomous Agents From autonomous code generation to decision-making systems that initiate actions without human intervention, the industry is entering a new phase. (Torsten George) Government Can’t Win the Cyber War Without the Private Sector Securing national resilience now depends on faster, deeper partnerships with the private sector. (Steve Durbin) The Hidden ROI of Visibility: Better Decisions, Better Behavior, Better Security Beyond monitoring and compliance, visibility acts as a powerful deterrent, shaping user behavior, improving collaboration, and enabling more accurate, data-driven security decisions. (Joshua Goldfarb) Flipboard Reddit Whatsapp Whatsapp Email

Entities