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.
The RansomHouse ransomware-as-a-service (RaaS) has recently upgraded its encryptor, switching from a relatively simple single-phase linear technique to a more complex, multi-layered method. [...]
Ransomware Gang Rhysida Leaks 3.7TB of Data Stolen From Maryland Hospital SystemMaryland-based MedStar Health, which operates 10 hospitals, is notifying patients about a data theft incident affecting their personal information. Ransomware group Rhysida claims on its darkweb leak site to have 3.7 terabytes of MedStar's data, including "over 7 million pieces of patient data."
Also: Texas AG Sues Smart TV Manufacturers, Fortinet SSO FlawsThis week, a leadership shakeup at Coupang, attackers exploited critical Fortinet SSO flaws, Pornhub data hacked, Texas Attorney General Ken Paxton sued smart TV makers, auto finance provider 700Credit disclosed a breach affecting millions, A revived pro-Russia ransomware operation stumbled.
Precision Agriculture Boost Yields but Opens Farmers to Cybersecurity RiskPrecision agriculture is transforming U.S. farming with sensors, drones and automation, boosting productivity yields. But growing digital dependence is also expanding the attack surface, exposing farms to ransomware, disruption and rising cybersecurity risk.
The Clop ransomware gang is targeting Internet-exposed Gladinet CentreStack file servers in a new data theft extortion campaign. [...]
Law enforcement has seized the servers and domains of the E-Note cryptocurrency exchange, allegedly used by cybercriminal groups to launder more than $70 million. [...]
Justice Department claims unlicensed exchange funneled ransomware profits US feds have dismantled a crypto laundering service that they say helped cybercrooks wash tens of millions of dollars in dirty digital cash, seizing its servers and unsealing charges against an alleged Russian operator.…
Security boffins warn flaw is now being used for ransomware attacks against live networks Microsoft says attackers have already compromised "several hundred machines across a diverse set of organizations" via the React2Shell flaw, using the access to execute code, deploy malware, and, in some cases, deliver ransomware.…
A ransomware gang exploited the critical React2Shell vulnerability (CVE-2025-55182) to gain initial access to corporate networks and deployed the file-encrypting malware less than a minute later. [...]
Cybercrime Gang Rhysida Still Lists the Practice on Its Leak Site Among Its VictimsA Kansas medical group will pay $1.2 million to settle proposed class action litigation involving an attack that compromised the sensitive data of nearly 256,000 individuals. The Rhysida ransomware operation claimed responsibility and said it stole 3 terabytes.
Ransomware groups are targeting hypervisors to maximize impact, allowing a single breach to encrypt dozens of virtual machines at once. Drawing on real-world incident data, Huntress explains how attackers exploit visibility gaps at the hypervisor layer and outlines steps orgs can take to harden virtualization infrastructure. [...]
Japanese e-commerce giant Askul Corporation has confirmed that RansomHouse hackers stole around 740,000 customer records in the ransomware attack it suffered in October. [...]
A new version of VolkLocker, wielded by the pro-Russia RaaS group CyberVolk, has some key enhancements but one fatal flaw.
Asahi Group’s CEO said he is considering creating a dedicated cyber unit following the ransomware attack that crippled the company
The pro-Russian hacktivist group known as CyberVolk (aka GLORIAMIST) has resurfaced with a new ransomware-as-a-service (RaaS) offering called VolkLocker that suffers from implementation lapses in test artifacts, allowing users to decrypt files without paying an extortion fee