Computer/Network Security
Breach intelligence, attack campaigns, and threat reports targeting the Computer/Network Security sector.
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Computer/Network Security Threat Reports
ClickFix Phishing Hits Hospitality: Hotel Credentials Compromised via PureRAT
In late 2025, the hospitality sector was targeted by a sophisticated, large-scale phishing campaign involving ClickFix-style lures that tricked hotel managers into revealing their credentials. Attackers leveraged compromised email accounts to distribute malicious links to numerous hotel establishments, leading victims to phishing sites that mimicked familiar workflow tools. Credential theft enabled deployment of PureRAT malware, which provided remote access to internal hotel systems and enabled lateral movement, resulting in compromised operations and data exposure for multiple organizations. This incident demonstrates the increasing use of advanced social engineering in credential-focused attacks against the hospitality industry. With phishing campaigns growing more convincing and commodity RATs like PureRAT widely available, organizations in high-turnover sectors face mounting risk from credential-based breaches and follow-on malware infections.
8 months ago
Kill Chain
TEE.fail: 2025 Hardware Attack Cracks Latest Secure Enclaves
In November 2025, researchers disclosed a critical hardware attack known as TEE.fail, which compromised secure enclaves (trusted execution environments or TEEs) across Intel, AMD, and ARM chips. By placing a small hardware device between a DDR5 memory chip and the motherboard, and leveraging kernel-level privileges, attackers were able to bypass the most advanced TEE protections including Confidential Compute, SEV-SNP, and TDX/SDX. Once exploited, these secure enclaves could no longer be trusted to protect sensitive data in-use, raising major concerns for cloud providers, enterprises, and users reliant on confidential computing. The attack’s low cost, simplicity, and applicability to modern hardware make it a significant development, reflecting growing sophistication in hardware-level threats. Regulatory scrutiny and industry attention have intensified as organizations reevaluate their trust assumptions and risk models for sensitive workloads.
8 months ago
Kill Chain
Yanluowang Ransomware & Access Broker Target U.S. Firms: Volkov Convicted
Between July 2021 and November 2022, multiple U.S. businesses—including an engineering firm and a bank—were targeted by the Yanluowang ransomware group, using access broker Aleksei Olegovich Volkov to gain initial entry. Volkov, operating as “chubaka.kor,” exploited vulnerabilities in victim networks, facilitated data theft and encryption, and coordinated ransom payments, some of which totaled $1.5 million. Victims suffered operational disruption, including temporary shutdowns and extortion attempts such as DDoS attacks and executive harassment. Forensic analysis linked the activities to Volkov via cryptocurrency tracing and communication evidence; $24 million in ransoms was demanded in total. This case highlights growing cooperation among cybercriminals, where access brokers sell or share footholds with ransomware operators, fueling larger-scale, multi-faceted cyber-extortion campaigns. The high-profile prosecution also sets precedent for international arrests and restitution, amid increasingly aggressive ransomware trends and evolving attack tactics.
8 months ago
Kill Chain
SonicWall 2024 Breach: Nation-State Actor Steals Firewall Backups in Supply Chain Attack
In early 2024, SonicWall, a prominent network security vendor, disclosed that a sophisticated nation-state threat actor had gained unauthorized access to its systems and exfiltrated firewall backup configurations. The breach exploited the MySonicWall cloud portal as an entry vector, allowing attackers to obtain sensitive backup files from certain customers. While SonicWall emphasized that no customer credentials or direct device access occurred, the compromised backup data could potentially aid attackers in mapping internal customer network topologies, exposing configurations, or enabling tailored downstream attacks. The breach was unrelated to the recent Akira ransomware campaign targeting SonicWall appliances. This incident underscores the increasing targeting of security infrastructure suppliers in supply chain attacks. With nation-state actors focusing on backup and configuration theft, the breach highlights emergent risks to organizations relying on third-party network security providers for confidentiality and resilience.
8 months ago
Kill Chain
SonicWall 2024 Cloud Backup Breach: Nation-State Attack Exposes Supply Chain Risks
In 2024, SonicWall disclosed a major supply-chain security incident where a state-sponsored threat actor exploited an API flaw to access the company's firewall cloud backup service. This breach, initially downplayed, resulted in the exposure and exfiltration of firewall configuration files for all customers leveraging SonicWall’s cloud backup. These files contained sensitive data such as firewall rules, encrypted credentials, and routing details, representing a significant risk for impacted organizations. An investigation by Mandiant confirmed the full scale of the compromise, though the specific country or threat group responsible remains undisclosed. This attack is especially relevant due to increasing targeting of security vendors and the potential for cascading risk across the customer base. The incident underscores persistent concerns over supply-chain vulnerabilities and the sophistication of nation-state actors focusing on critical infrastructure providers.
8 months ago
Kill Chain
SonicWall Cloud Backup Breach: How State-Sponsored Attackers Exploited API Weaknesses in 2025
In September 2025, SonicWall confirmed that state-sponsored threat actors orchestrated a security breach targeting its cloud backup environment. The attackers exploited an API vulnerability to gain unauthorized access to firewall configuration backup files stored in a specific cloud deployment. SonicWall's investigation determined the breach was limited to the exposure of these configuration files, with no evidence of lateral movement or impact to production systems. The breach prompted immediate containment actions, disclosure to affected customers, and a global review of cloud access controls and incident response procedures. This incident underscores the increasing risk posed by sophisticated, nation-state adversaries targeting cloud environments and API endpoints. It highlights how misconfigurations and insufficient segmentation in cloud infrastructure can facilitate data exposure, driving industry-wide reassessment of cloud-native security and compliance practices.
8 months ago
Kill Chain
Phishing Attack Delivers Kalambur Backdoor via Trojanized ESET Installers in Ukraine
In May 2025, a Russia-aligned threat group tracked as InedibleOchotense conducted a spear-phishing campaign targeting Ukrainian organizations. Attackers impersonated Slovak security company ESET, delivering phishing emails and Signal messages containing malicious links to trojanized ESET installers. When unsuspecting victims executed these files, a previously undocumented backdoor named Kalambur was installed, granting attackers covert access to compromised systems and enabling persistent network reconnaissance, command execution, and data exfiltration. The impersonation of a well-known cybersecurity firm lent the campaign added credibility, elevating its success rate and risk to targeted entities. This incident is a stark illustration of evolving phishing TTPs that exploit software supply chain trust and employ realistic impersonation. The campaign highlights the enduring threat posed by nation-state actors employing sophisticated lures, and underscores the urgent need for vigilant software validation, phishing awareness, and robust protective controls across organizations operating in high-risk geopolitical regions.
8 months ago
Kill Chain
US Sanctions North Korean Banks for Cryptocurrency Cybercrime in 2024
In May 2024, the U.S. Treasury sanctioned two North Korean banks and eight individuals believed to be heavily involved in high-profile cryptocurrency laundering operations linked to state-sponsored cybercrime. The sanctioned parties allegedly laundered millions of dollars in digital assets stolen through cyberattacks and IT worker fraud, often hiding illicit proceeds to evade international detection. North Korean operatives reportedly posed as legitimate IT contractors for Western firms to gain unauthorized access to sensitive systems and divert funds, fueling further malicious operations and funding government programs in Pyongyang. This incident exemplifies shifting tactics in cyber-enabled financial crime, where attackers exploit advanced laundering techniques and foggy compliance areas around cryptocurrency. The urgency of improved detection and policy enforcement is fueled by growing international regulatory pressure and the adaptation of state-sponsored groups to exploit digital infrastructure.
8 months ago
Kill Chain
State-Sponsored Attackers Breach SonicWall Firewall Backups in 2023
In September 2023, SonicWall disclosed a security breach where state-sponsored threat actors gained unauthorized access to systems containing customer firewall configuration backup files. The incident was investigated thoroughly, and SonicWall determined that sophisticated attackers exploited vulnerabilities, allowing access to backup files with potentially sensitive customer information. The breach did not involve ransomware or financial extortion but had the potential to expose operational details and configurations of deployed firewalls, raising concerns over further lateral movement or exploitation. Attacks like these underscore the growing threat posed by well-resourced, nation-state actors directly targeting technology vendors and supply chain components. As attackers prioritize exploiting configuration data, the security of infrastructure suppliers is under renewed scrutiny and regulatory interest, emphasizing the need for robust data encryption, segmentation, and incident response.
8 months ago
Kill Chain
U.S. Cybersecurity Insiders Indicted for BlackCat Ransomware Attacks (2023)
Between May and November 2023, a trio of U.S.-based individuals—including two named suspects and an unnamed co-conspirator—compromised the networks of five American companies using BlackCat (ALPHV) ransomware. Prosecutors allege that the attackers, all cybersecurity insiders, leveraged privileged access and technical expertise to deploy ransomware on a range of targets, including a medical organization, resulting in considerable financial losses and data encryption. The conspirators used advanced methods to extort payments, disrupt operations, and evade detection. This incident highlights the growing risk posed by insider threats and the increasing sophistication of ransomware groups like BlackCat/ALPHV. Such attacks are driving regulatory calls for enhanced east-west network controls, granular segmentation, and robust anomaly detection as ransomware tactics continue to evolve.
8 months ago
Kill Chain
Operation SkyCloak: Tor-Enabled OpenSSH Backdoor Infiltrates Defense Networks
In November 2025, a sophisticated cyber campaign dubbed 'Operation SkyCloak' was uncovered, targeting Russian and Belarusian defense sectors. Attackers distributed weaponized attachments via phishing emails, successfully implanting a persistent OpenSSH-based backdoor on compromised hosts. To conceal its activity, the malware leverages a customized Tor hidden service with obfs4 protocol, facilitating covert command-and-control and persistent unauthorized access. This campaign demonstrates advanced threat actor operational security, targeting high-value government and defense assets to enable espionage and data exfiltration. The use of Tor-enabled backdoors in defense-related attacks is surging, marking a shift towards more covert, untraceable threat tactics. This incident exemplifies the growing adoption of anonymized infrastructure by attackers to evade detection, highlighting urgent requirements for east-west traffic inspection, advanced threat detection, and zero trust segmentation for critical sectors.
8 months ago
Kill Chain
European Authorities Bust €600M Crypto Fraud Network in Pan-European Operation
In late October 2025, European authorities led by Europol and Eurojust dismantled a sophisticated cryptocurrency money laundering network responsible for stealing €600 million (around $688 million) through large-scale crypto fraud schemes. The coordinated operation spanned Cyprus, Spain, and Germany, resulting in the arrest of nine suspects linked to elaborate investment scams, phishing, and online fraud. The network leveraged complex cross-border laundering methods, making use of encrypted digital transactions and a web of services to obfuscate stolen funds, ultimately victimizing thousands of individuals across multiple nations. The case spotlights the emergence of organized crime groups exploiting cryptocurrency platforms for large-scale financial fraud and money laundering. It underscores the urgent need for robust regulatory frameworks and advanced monitoring tools, as law enforcement agencies worldwide face growing challenges combating tech-enabled fraud tied to the volatile, largely unregulated crypto sector.
8 months ago
Kill Chain
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