Ransomware encrypts or steals data to disrupt operations and extort victims, making backups, access controls, and incident response essential.
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Background for this topic.
Ransomware is malware used to deny access to systems or data, usually by encrypting files and demanding payment for decryption. Many operations also steal sensitive information and threaten to publish it, so an attack can create both an availability crisis and a privacy or disclosure risk. Initial access may involve phishing, stolen credentials, exposed remote services, or exploitation of unpatched vulnerabilities; attackers may then move through the network before deploying the payload.
Defenses should combine vulnerability management, phishing-resistant authentication where practical, endpoint and network monitoring, and backups that are isolated from routine administrator access and regularly tested for recovery. Organizations should also limit privileges and segment critical systems to reduce the blast radius. An incident requires rapid containment, preservation of forensic evidence, restoration from known-good backups, and assessment of notification, legal, and regulatory obligations. Threat intelligence can help identify relevant criminal infrastructure or tactics, but it does not replace sound access control, patching, detection, and recovery practices.
Also: Rethinking IT-OT Integration; Previewing Black Hat 2025In this week's update, four ISMG editors discussed the latest on the ToolShell exploit and the rise of Warlock ransomware, why IT-OT integration may not be the best answer for industrial security and what to expect next week from ISMG Studio at Black Hat Conference 2025.
CyberArk Deal Adds Privileged Access Capabilities to Palo Alto Networks' Core StackWith a $25 billion acquisition of CyberArk, Palo Alto Networks expands its cybersecurity platform to secure human, machine and AI identities. CEO Nikesh Arora said the move is timely as 88% of ransomware attacks now stem from credential theft, and agentic AI emerges as a new risk vector.
145 Organizations Compromised by China-Linked Ransomware Hackers and OthersNearly 150 different organizations' on-premises SharePoint servers have been exploited by attackers targeting the zero-day vulnerabilities now tracked as ToolShell, researchers warn. Early attacks have been attributed to China-linked groups, in some cases leading to Warlock ransomware infections.
Operation Checkmate Disrupts One of the Large Russian-Speaking Ransomware GroupsAn international law enforcement operation has disrupted BlackSuit, a ransomware group tied to hundreds of victims and ransom demands that exceeded half a billion dollars. The takedown occurred as security experts tracked the rise of a new group called Chaos, which may be a BlackSuit rebrand.