Security Advisories

Advisory • High Priority APT28 Campaign Uses Office Security Bypass (CVE-2026-21509) Russia-linked APT28 rapidly weaponised CVE-2026-21509 following disclosure, combining phishing, evasive execution chains, and cloud-hosted infrastructure to accelerate compromise. Download Full Report Subscribe for weekly briefings → Since its disclosure and patch release in January 2026, CVE-2026-21509 has been actively exploited by the Russia-linked advanced persistent threat group APT28. The campaign combines spear phishing, evasive execution chains, and cloud-hosted command-and-control infrastructure to minimise detection opportunities and accelerate initial compromise. This activity reflects a broader shift in advanced threat operations: rapidly operationalising newly disclosed vulnerabilities, leveraging trusted cloud services to blend malicious activity with legitimate traffic, and using multi-stage payload delivery to bypass traditional endpoint defences. The speed of exploitation highlights the diminishing window between patch release and real-world attacks. This advisory summarises the observed tradecraft, outlines the strategic implications for enterprise security programs, and provides practical recommendations to strengthen detection, response, and resilience against rapidly evolving nation-state tactics. Read more: Download the full report

Advisory • High Priority CyberStash 2025 Threat Analysis Report Over the past year, cyber threat activity has surged in sophistication, blending nation-state espionage tactics with financially motivated cybercrime. Advanced Persistent Threat (APT) groups haveexpanded their target scope and toolsets, demonstrating agile development and stealth. Campaigns such as those by the Lazarus Group (North Korea) and SideWinder (South Asia) rolled outnew malware families and complex infection chains that largely evade traditional defenses. Meanwhile, cybercriminals are weaponizing fileless malware loaders and info-stealers (e.g. PS1Bot,NonEuclid RAT, StealC v2) to achieve similar stealth and impact. Common threads include heavyabuse of legitimate operating system tools (“living off the land”), in-memory or fileless attacktechniques, and exploitation of trusted platforms for Command-and-Control (C2). Attackers increasingly leverage malvertising, cloud services, and “bulletproof” hosting infrastructure to bypass traditional security filters.   This report provides a comprehensive analysis of these trends – mapping adversary tactics to theMITRE ATT&CK framework, highlighting notable campaigns (both APT and criminal), and distillingrecurring indicators of compromise (IOCs) and tools. Crucially, we outline enterprise-grade defensive recommendations for each trend, emphasizing proactive threat hunting, attack surface reduction, and resiliency improvements.Security leaders should take away strategic insights on how threat actors evolved in 2024–2025 and how to bolster…

Advisory • High Priority BRICKSTORM: Beneath the Security Stack BRICKSTORM is a strategic, state-aligned cyber-espionage capability operated by a China-nexus threat actor focused on long-term access, not short-term disruption. Across multiple investigation cycles, it has shown continuous evolution, environmental adaptability, and a clear bias toward stealth, persistence, and strategic positioning rather than speed or scale. Unlike commodity malware, BRICKSTORM is purpose-built for long-dwell espionage. It is deliberately embedded within virtualisation platforms, identity infrastructure, and cloud-adjacent control layers—areas that often sit outside the visibility of traditional endpoint security and default SIEM monitoring. This positioning allows lateral control across entire environments while remaining largely unseen. From an intelligence perspective, BRICKSTORM should be viewed not as a standalone tool, but as a core component of a wider covert access framework supporting Chinese state-aligned cyber operations. Its continued refinement and disciplined operational security reflect an adversary investing in enduring, low-visibility access and future-option strategic leverage, not immediate impact. This report provides a strategic, multi-source intelligence assessment of the BRICKSTORM campaign, translating adversary tradecraft into executive-level risk, intent, and defensive priorities for organisations and national stakeholders. Download Full Report Subscribe for weekly briefings → Read more: Download the full report