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Antes de ontemFirewall Daily – The Cyber Express
  • ✇Firewall Daily – The Cyber Express
  • Ransomware Attacks on Hospitals and Businesses Lead to 70-Month Sentence Samiksha Jain
    A Ukrainian ransomware affiliate has been sentenced to 70 months in prison for participating in cyberattacks against hospitals, businesses, law firms and government entities across multiple countries. Artem Stryzhak, 36, was sentenced in the United States for his role in ransomware conspiracies linked to more than $100 million in losses, according to the U.S. Department of Justice (DOJ). Stryzhak worked with the Nefilim ransomware and Hive ransomware groups, targeting computer network
     

Ransomware Attacks on Hospitals and Businesses Lead to 70-Month Sentence

29 de Outubro de 2026, 05:57

Ukrainian ransomware affiliate

A Ukrainian ransomware affiliate has been sentenced to 70 months in prison for participating in cyberattacks against hospitals, businesses, law firms and government entities across multiple countries. Artem Stryzhak, 36, was sentenced in the United States for his role in ransomware conspiracies linked to more than $100 million in losses, according to the U.S. Department of Justice (DOJ). Stryzhak worked with the Nefilim ransomware and Hive ransomware groups, targeting computer networks and disrupting operations across different sectors. The attacks included incidents affecting healthcare providers during the COVID-19 pandemic, when hospitals faced disruptions to their ability to access digital systems and treat patients.

Ukrainian Ransomware Affiliate Linked to Two Groups

According to court documents, Stryzhak joined the Nefilim ransomware operation around June 2021 as an affiliate. He received access to the group's ransomware under an arrangement with administrator Volodymyr Tymoshchuk and agreed to pay the administrators 20% of the ransom proceeds collected from victims. One documented attack took place in June 2021, when Stryzhak stole data from a company operating in the oil and gas transportation industry. About a week later, he created email addresses that were incorporated into a ransom note sent to the company. The attackers used ransomware to encrypt victims' files and demanded payment. If a victim paid, the perpetrators provided a decryption key to restore access to the locked data. Stryzhak remained involved in the Nefilim conspiracy until at least October 2021, court records state. He separately joined the Hive ransomware group as one of its earliest affiliates. Between June 2021 and January 2023, Hive conspirators attacked approximately 1,500 victims worldwide, including government entities, hospitals and businesses.

Hive Ransomware Attacks Disrupted Hospital Operations

The Hive ransomware operation caused significant disruption to organizations, including healthcare facilities responding to the COVID-19 pandemic. According to the DOJ, one hospital targeted by the group had to stop relying on digital technology to treat existing patients and was temporarily unable to accept new patients immediately following the attack. As a Hive affiliate, Stryzhak and his co-conspirators deployed ransomware against seven victims. These included law firms, a dental office and a healthcare provider during the pandemic. The attacks left victims unable to access encrypted data, affecting their day-to-day operations. The FBI had previously conducted a months-long disruption campaign against Hive. During that effort, investigators obtained a decryption key and provided it to one of Stryzhak's victims, enabling the organization to recover its encrypted data without paying a ransom.

FBI Investigation Spanned Multiple Countries

The investigation involved several FBI field offices and international law enforcement partners. The FBI Springfield Field Office investigated the Nefilim ransomware case, while the FBI Tampa Field Office investigated the Hive operation. The FBI's New York Field Office, the Justice Department's Office of International Affairs and Spanish law enforcement authorities also assisted in locating, arresting and extraditing Stryzhak. He was arrested in Spain in June 2024 and extradited to the United States in April 2025. In December 2025, he pleaded guilty to two counts of conspiracy involving fraud, extortion and related activity connected to computers. The sentence follows a broader effort by U.S. authorities to pursue ransomware affiliates and their associates, including individuals operating outside the country.

$11 Million Reward Offered for Co-Conspirator

Authorities are continuing to seek Volodymyr Viktorovych Tymoshchuk, identified by prosecutors as Stryzhak's co-conspirator and a ransomware developer. The U.S. Department of State's Transnational Organized Crime Rewards Program is offering up to $11 million for information leading to Tymoshchuk's arrest and/or conviction or location. Individuals with information can contact the FBI at +1-917-242-1407, email TymoTips@fbi.gov, contact a local FBI field office in the United States or approach the nearest U.S. Embassy overseas. The DOJ's Computer Crime and Intellectual Property Section, which investigates and prosecutes cybercrime in coordination with domestic and international partners, has secured more than 180 convictions involving cybercrime and intellectual property offenses since 2020. The department also reports obtaining court orders for the return of more than $350 million in victim funds during that period. Stryzhak's sentence highlights the consequences for individuals who participate in ransomware operations that target critical services and businesses. The investigation into his alleged co-conspirators remains ongoing.
  • ✇Firewall Daily – The Cyber Express
  • FBI, CISA Warn SafePay Ransomware Has Hit 600+ Victims Samiksha Jain
    The FBI, CISA and international partners have issued a warning about SafePay ransomware, a group that has impacted at least 600 victims across multiple critical infrastructure sectors since August 2024. Published on October 20, 2026, the joint cybersecurity advisory describes SafePay as among the most active ransomware groups in 2026, with operations affecting organizations in North America, South America, Europe and Australia. The advisory was released by the FBI, the Cybersecurity and Infrastr
     

FBI, CISA Warn SafePay Ransomware Has Hit 600+ Victims

22 de Outubro de 2026, 03:52

SafePay ransomware

The FBI, CISA and international partners have issued a warning about SafePay ransomware, a group that has impacted at least 600 victims across multiple critical infrastructure sectors since August 2024. Published on October 20, 2026, the joint cybersecurity advisory describes SafePay as among the most active ransomware groups in 2026, with operations affecting organizations in North America, South America, Europe and Australia.

The advisory was released by the FBI, the Cybersecurity and Infrastructure Security Agency (CISA), the United States Secret Service, Germany’s Landeskriminalamt Rheinland-Pfalz, the United Kingdom’s National Crime Agency and the UK’s North West Regional Organised Crime Unit. It draws on investigations conducted as recently as August 2026.

How SafePay Ransomware Gains Initial Access

According to the agencies, SafePay actors break into networks by stealing or guessing passwords, running brute force attacks, using phishing and exploiting VPN access. The group uses IP addresses from the VPN provider Mullvad and phished account profiles to exploit two flaws in edge devices: CVE-2020-3259 and CVE-2023-20269.

The actors also use automated scripts to exploit three vulnerabilities in internet-exposed systems: CVE-2023-27532, CVE-2024-40711 and CVE-2024-40766.

Living Off the Land Inside Victim Networks

Once inside, SafePay actors establish persistence by gaining administrative privileges on existing accounts or creating new ones. They rely on built-in tools such as PsExec, Windows Remote Management and Remote Desktop Protocol to execute commands and move laterally.

To find valuable files, the group has used ShareFinder.ps1 and SharpShares.exe to enumerate network shares. Before moving laterally, the actors commonly disable security software. In some cases, they changed system users’ passwords, locking legitimate users out. The advisory also notes the use of a User Account Control bypass, token impersonation and the credential dumper Mimikatz.

Data Exfiltration Before Encryption

Data exfiltration is a central part of the group’s playbook. SafePay actors compress files using 7-Zip, WinRAR, FileZilla and RClone, then move stolen data out through WinSCP, RClone, OneDrive and the Backblaze command-line tool b2.exe. Remote desktop tools such as AnyDesk and TeamViewer have been installed to transfer ransomware onto victim systems.

To block recovery, the actors halt the Volume Shadow Copy Service and reset network attached storage holding backups to factory settings.

Files are then encrypted using a hybrid scheme combining the ChaCha20 stream cipher with RSA public-key cryptography. Encrypted files carry the .SafePay extension and, according to the advisory, cannot be recovered without the decryption key.

The group typically demands a portion of company revenue in cryptocurrency. A ransom note left on the desktop or root directory directs victims to a TOR chat portal, using a victim ID to log in. A representative also makes phone calls to pressure victims. If payment is refused, stolen data is posted to SafePay’s leak site. The ransomware may delete itself after encryption.

SafePay Ransomware Advisory: Recommended Defenses

To reduce the risk of ransomware attacks from SafePay, the agencies urge organizations to prioritize patching known exploited vulnerabilities, especially on firewalls and other internet-facing systems. They recommend requiring multifactor authentication for webmail, VPNs and accounts that access critical systems.

Other measures include passwords of 15 to 64 characters, account lockouts after failed logins, offline backups that are encrypted and immutable, network segmentation, least privilege access and time-based admin access. The advisory also recommends restricting command-line and scripting permissions.

The advisory lists IP addresses, file names, hashes and hostnames observed between November 2024 and August 2026. The agencies advise verifying these indicators before blocking, as some IP addresses may later be reassigned to benign services.

The authoring agencies do not encourage paying ransom, noting payment does not guarantee file recovery. Incidents can be reported to the FBI’s Internet Crime Complaint Center, a local FBI or Secret Service field office, or CISA. In the UK, victims can report through Report Fraud or their local police force.

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The Cyber Express Weekly Roundup: US Puts $10 Million Bounty on Chinese Hacker, Japan Moves to Hunt Hidden Attackers and More

9 de Outubro de 2026, 10:22

weekly roundup October 9th

This weekly roundup covers a massive exposure of personal data from Denmark's national population register, a U.S. bounty on a Chinese hacker accused of stealing COVID-19 research, Japan's plan to actively search for attackers hiding in its critical infrastructure, a pair of breaches at Japanese publisher Nikkei, a call for AI-driven decision-making in security operations, and a Massachusetts town's ongoing recovery from an August cyberattack.  Two threads run through this week's stories. First, attackers keep getting in through doors that were already open: a company's lawful access to a government register, employees' hijacked email accounts, and unpatched mail servers. Second, the time between intrusion and discovery remains dangerously long, which is why governments and security leaders are pushing to find intruders sooner and respond faster. 

The Cyber Express Weekly Roundup 

Hackers Abuse Company's Legitimate Access to Expose Data of 8.8 Million in Denmark 

The Danish government said unauthorized individuals obtained the names, addresses, and CPR numbers of roughly 8.8 million people from the Central Person Register. They did it by misusing the legal access granted to a private Danish company. The register holds records on about 11 million people, including residents, Danes living abroad, and deceased individuals. Read more… 

US Offers $10 Million Reward for Chinese Hacker Accused of Stealing COVID-19 Research 

The U.S. State Department is offering up to $10 million for information on Zhang Yu, a Chinese national accused of hacking COVID-19 research at U.S. universities on behalf of China's Ministry of State Security. Zhang and his alleged partner, Xu Zewei, are also tied to the 2021 HAFNIUM campaign, which exploited Microsoft Exchange vulnerabilities to compromise more than 12,700 U.S. entities. Xu was arrested in Italy in 2025 and extradited to the U.S. in April 2026. Zhang remains at large. Read more… 

Japan to Launch Threat Hunting Program to Find Hidden Attackers in Critical Infrastructure 

Japan plans to partner with private companies in fiscal 2027 to proactively look for attackers who may already be sitting undetected inside power, telecom, and other critical infrastructure networks. The National Cybersecurity Office will build detection methods by recreating attack scenarios in a virtual environment and will share them with operators. The Defense Ministry will provide experienced personnel to companies on request. Read more… 

Nikkei Hit by Two Breaches as Hijacked Accounts Send 9,000 Malicious Emails 

Japanese publisher Nikkei disclosed on October 4 that attackers had taken over employees' Microsoft 365 accounts. On September 30, they used those accounts to send roughly 9,000 emails with malicious links to staff and external contacts. Nikkei also revealed a separate breach of its Google Workspace accounts, ongoing since late July, that may have exposed the names and email addresses of 1,646 employees and business partners. Read more… 

Agentic AI Turns Cybersecurity Into a Race of Decision Speed 

In an opinion piece, Cyble's Salleh Kodri argues that security teams no longer struggle to see threats. Their problem is "decision latency": the time it takes to turn alerts from many tools into the right action. As AI accelerates attackers' reconnaissance and decision-making, Kodri says defenders should use AI to correlate intelligence and act faster. Read more… 

Andover Confirms Attackers Accessed Town Systems in August Cyberattack 

Officials in Andover, Massachusetts, confirmed that the August 13 cyberattack involved unauthorized access to some town systems. They have not yet determined whether any data was stolen or whether personal information was involved. The town says it paid no ransom. It has hired a law firm and cybersecurity firm Vector3 to investigate, with costs covered by cyber insurance. Read more… 

Weekly Cybersecurity Takeaway 

Several of this week’s incidents started with access that looked legitimate. In Denmark, attackers abused a private company’s authorized connection to the national register instead of breaking in. At Nikkei, hijacked employee accounts sent thousands of malicious emails under a trusted name.  Time is the other common thread. Nikkei’s Google Workspace breach ran for over two months before disclosure, and Andover still doesn’t know what was taken. Japan’s threat hunting plan assumes attackers may already be inside, and Kodri warns that spotting an alert means little if acting on it takes too long.  Organizations should monitor third-party access as closely as their own staff’s. They should secure email accounts with phishing-resistant authentication and actively hunt for intruders rather than wait for alerts. 
  • ✇Firewall Daily – The Cyber Express
  • Gunra Ransomware Builds a New Attack Network Through RaaS Samiksha Jain
    Gunra ransomware has expanded its operations through a structured ransomware-as-a-service (RaaS) affiliate program, prompting the FBI, CISA and other agencies to issue a joint advisory warning organizations about the threat. The Gunra ransomware variant uses a double-extortion model, encrypting victim data while threatening to publish stolen information on a dedicated leak site if ransom demands are not met. The FBI first observed Gunra in April 2025 as a double-extortion ransomware variant d
     

Gunra Ransomware Builds a New Attack Network Through RaaS

11 de Agosto de 2026, 08:01

Gunra ransomware

Gunra ransomware has expanded its operations through a structured ransomware-as-a-service (RaaS) affiliate program, prompting the FBI, CISA and other agencies to issue a joint advisory warning organizations about the threat. The Gunra ransomware variant uses a double-extortion model, encrypting victim data while threatening to publish stolen information on a dedicated leak site if ransom demands are not met. The FBI first observed Gunra in April 2025 as a double-extortion ransomware variant derived from leaked Conti ransomware source code.

Gunra Ransomware Shifts to Affiliate Model

By early 2026, the group had expanded through a formal ransomware-as-a-service affiliate program advertised on dark web forums. The program provides affiliates with a management panel, configurable ransomware builder, cross-platform locker payloads and affiliate documentation. The FBI also observed Gunra operating under new branding aliases, including Golden Community, while recruiting penetration testers and ethical hackers as initial access brokers. Gunra initially focused on Windows environments before introducing a Linux variant and moving toward broader cross-platform targeting. Victims observed on the group’s dedicated leak site include organizations across the Americas, Europe, the Middle East, Africa and the Asia-Pacific. Targeted sectors include healthcare and public health, financial services and insurance, critical manufacturing, transportation, government services, utilities, academia, media and communications, retail, and professional and nonprofit services. Gunra ransomware

VPN Vulnerabilities Used for Initial Access

According to the advisory, Gunra actors primarily gained initial access by exploiting known vulnerabilities in internet-facing devices, including firewall and VPN gateways. The FBI observed exploitation of CVE-2024-55591 and CVE-2025-24472, authentication bypass vulnerabilities affecting specific FortiOS and FortiProxy versions. The Republic of Korea’s National Police Agency also observed Gunra actors exploiting credential exposure and SSH access control weaknesses in internet-facing VPN gateways to obtain unauthorized remote access. After gaining access, attackers used tools including Impacket utilities to move laterally through victim networks using SMB. In one case, actors compromised an SSL-VPN appliance using default credentials where account lockout controls were absent. They later used stolen session information to access internal virtual desktop infrastructure and move through systems including Active Directory servers and IT personnel workstations.

Data Theft Precedes Encryption

The double-extortion ransomware operation involves stealing sensitive information before encrypting systems. The FBI observed Gunra actors collecting business-critical documents, databases, personally identifiable information, and internal email communications. In at least one case, the actors used a malicious executable called main.exe to exfiltrate data from Microsoft OneDrive and SharePoint. Compressed archives containing sensitive information were also transferred to the Mega file-sharing service, with the volume of exfiltrated data reaching tens of terabytes. For encryption, Gunra uses ChaCha20 and RSA-4096 algorithms and has been observed using the .ENCRT extension for encrypted files. A documented sample from July 2025 used the .CRYPT extension. The ransomware also uses Windows Management Instrumentation to delete volume shadow copies before encryption, while one victim had backup and archived data deleted from both primary and disaster recovery infrastructure.

Agencies Urge Patching and Network Segmentation

The authoring agencies recommend that organizations prioritize patching known exploited vulnerabilities in internet-facing systems, including VPN gateways and RDP-exposed infrastructure. They also advise implementing and testing offline, immutable backups stored in physically separate and segmented locations. Network segmentation is another key recommendation, intended to restrict lateral movement and limit the spread of ransomware between systems. The agencies also recommend reviewing domain controllers, servers, workstations and Active Directory environments for unrecognized accounts, auditing administrative privileges, requiring MFA where possible and testing security controls against the Gunra techniques mapped to the MITRE ATT&CK framework. The joint advisory was published August 10, 2026, as part of the ongoing #StopRansomware initiative.
  • ✇Firewall Daily – The Cyber Express
  • Ransomware Kingpin Gets 16 Years for Global Cyberattacks Samiksha Jain
    A Ransom Cartel ransomware leader has been sentenced to 16 years in prison after being convicted of conspiracy to commit offenses against the United States, conspiracy to commit wire fraud, and aggravated identity theft, according to the U.S. Department of Justice. Maksim Silnikau, a 40-year-old Belarusian national, was identified in court documents as the creator and administrator of the Ransom Cartel ransomware strain, which was developed in 2021. Silnikau had been active on Russian-speakin
     

Ransomware Kingpin Gets 16 Years for Global Cyberattacks

10 de Agosto de 2026, 04:54

Ransom Cartel ransomware

A Ransom Cartel ransomware leader has been sentenced to 16 years in prison after being convicted of conspiracy to commit offenses against the United States, conspiracy to commit wire fraud, and aggravated identity theft, according to the U.S. Department of Justice. Maksim Silnikau, a 40-year-old Belarusian national, was identified in court documents as the creator and administrator of the Ransom Cartel ransomware strain, which was developed in 2021. Silnikau had been active on Russian-speaking cybercrime forums since at least 2005 and was also a member of the cybercrime website Direct Connection between 2011 and 2016.

Ransom Cartel Ransomware Operation

Beginning in May 2021, Silnikau developed the ransomware scheme and recruited participants through cybercrime forums. He distributed information and tools to participants, including stolen credentials linked to compromised computers and tools designed to encrypt or lock those systems. Silnikau also maintained a hidden website used by himself and his co-conspirators to monitor and control ransomware operations. According to the court documents, the website provided a platform for the group to communicate with one another, interact with victims, send and negotiate ransom demands, and manage the distribution of funds among the conspirators. The operation targeted companies between 2021 and 2023. During that period, Ransom Cartel ransomware conspirators carried out attacks against at least 18 companies around the world, including organizations based in California, New York, Nebraska, and other countries outside the United States.

Ransomware Attacks Targeted Companies Worldwide

The ransomware attacks involved data theft and monetary demands. The attackers sought payment in exchange for providing keys to unlock stolen data or for promises not to publish the information taken from victims. The operation’s growth was disrupted following Silnikau’s arrest in July 2023. He was later extradited from Poland to face prosecution in the Eastern District of Virginia and the District of New Jersey. The sentencing announcement was made by Theophani K. Stamos, First Assistant U.S. Attorney for the Eastern District of Virginia; Acting Special Agent in Charge Andrew Forrest of the U.S. Secret Service Criminal Investigative Division; Chris Ormerod, Special Agent in Charge of the FBI Kansas City Field Office; and Craig L. Tremaroli, Special Agent in Charge of the FBI Albany Field Office.

Maksim Silnikau Sentenced to 16 Years

The Justice Department’s Office of International Affairs provided substantial assistance with Silnikau’s extradition and the collection of evidence. The U.S. Attorney’s Office for the District of New Jersey and the Computer Crime and Intellectual Property section also assisted with the case. Assistant U.S. Attorney Jonathan S. Keim and former Assistant U.S. Attorney Zoe Bedell prosecuted the case. The 16 years in prison sentence follows the disruption of an international ransomware operation that targeted at least 18 companies during its active period. Silnikau’s role, according to court documents, extended across the development and administration of the ransomware strain, recruitment of participants, provision of attack tools, victim communications, and management of funds generated through the operation.
  • ✇Firewall Daily – The Cyber Express
  • How the World’s Most Active Ransomware Operation Expanded in H1 2026 Ashish Khaitan
    The first half of 2026 reinforced a familiar reality in ransomware: a small number of highly capable operators continue to drive a disproportionate share of global attacks. Among them, Qilin ransomware emerged as the most active threat group tracked by Cyble Research and Intelligence Labs (CRIL), demonstrating the scale and reach of today’s ransomware-as-a-service (RaaS) ecosystem. CRIL observed Qilin targeting organizations across multiple regions and industries, with activity spanning North
     

How the World’s Most Active Ransomware Operation Expanded in H1 2026

Qilin ransomware

The first half of 2026 reinforced a familiar reality in ransomware: a small number of highly capable operators continue to drive a disproportionate share of global attacks. Among them, Qilin ransomware emerged as the most active threat group tracked by Cyble Research and Intelligence Labs (CRIL), demonstrating the scale and reach of today’s ransomware-as-a-service (RaaS) ecosystem. CRIL observed Qilin targeting organizations across multiple regions and industries, with activity spanning North America, Europe, Asia-Pacific, South America, and other global markets. Its widespread campaigns highlight how modern ransomware groups leverage affiliate networks, purchased access, and proven extortion techniques to maintain sustained operational momentum.

Download the Cyble H1 2026 Cyber Threat Landscape Report for the full analysis.

Breaking Down the Qilin Ransomware Operation 

Qilin’s activity was particularly significant in North America, where the group accounted for 370 ransomware attacks during H1 2026. This represented nearly one-fifth of all ransomware incidents recorded in the region. Qilin ransomware The group also maintained a strong presence in Europe and the UK, claiming 158 attacks, while Asia-Pacific recorded 64 incidents linked to Qilin. In South America, the group was responsible for 40 attacks, further demonstrating its ability to operate across diverse geographic environments. Rather than concentrating on a single market, Qilin followed a broad targeting strategy designed to maximize opportunities across industries. 

Targeting Sectors Where Downtime Hurts Most 

Qilin’s victim profile reflected a common ransomware strategy: focusing on organizations where operational disruption creates immediate pressure.  Manufacturing organizations remain especially attractive because ransomware incidents can interrupt production lines and affect supply chains. Healthcare organizations face additional pressure due to the critical nature. Construction, Healthcare, and Professional Services were among the sectors most frequently targeted. These industries often depend on continuous availability, hold sensitive information, and face significant financial or regulatory consequences when systems are disrupted.  Manufacturing organizations remain especially attractive because ransomware incidents can interrupt production lines and affect supply chains. Healthcare organizations face additional pressure due to the critical nature of their services and the sensitivity of patient information.  Professional Services firms, including legal and consulting organizations, also represent valuable targets because they manage confidential client data that can increase the impact of double-extortion campaigns. 

The RaaS Model Behind Qilin’s Growth 

Qilin’s success reflects the maturity of the ransomware-as-a-service model. Instead of relying on a single internal team to handle every stage of an attack, RaaS groups operate through specialized ecosystems that include affiliates, initial access brokers, and other underground service providers.  This structure allows ransomware brands to expand quickly, launch simultaneous campaigns, and maintain activity even as individual operators face disruption. The continued success of groups like Qilin shows why ransomware remains difficult to contain. Law enforcement actions and infrastructure takedowns can affect individual operations, but decentralized affiliate models allow new campaigns to continue.

Defending Against the Qilin Threat 

The group’s activity reinforces several priorities for organizations: reducing exposed attack surfaces, strengthening identity controls, monitoring suspicious access activity, and preparing for data theft alongside encryption.  Since ransomware operators increasingly rely on stolen credentials and compromised infrastructure, security programs must focus on preventing initial access as much as responding to active attacks. 

To explore Qilin’s attack patterns, global ransomware trends, targeted industries, and the broader threat landscape observed in H1 2026, download the complete Cyble H1 2026 Cyber Threat Landscape Report. 

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