Cavern Manticore, an Iran-MOIS-linked APT group, deploys a modular .NET C2 framework targeting Israeli government and IT organizations. The framework uses three compilation formats (Mixed-Mode C++/CLI, NativeAOT, .NET Framework) as an anti-analysis layer, with DLL sideloading via WinDirStat.exe for initial execution. Post-exploitation modules provide DPAPI decryption, LDAP brute-forcing, SQL browsing, network reconnaissance, and SOCKS5 tunneling, with C2 traffic XOR-encrypted over HTTPS/WebSocket channels.
Kaspersky's 2025 compromise assessment report reveals that organizations consistently fail to detect long-dwelling threats, with 30.8% of incidents persisting over 3 months and 52% of high-severity compromises going undetected for 90+ days. Key findings include widespread abuse of LoLBins and remote management tools in every incident-bearing engagement, 40% of web shells surviving in backups to be restored post-remediation, and a strong correlation between in-house forensics/reverse-engineering capability and reduced incident severity. Multiple case studies document dormant crypto-mining on domain controllers (4 years), in-memory LionTail implants on critical servers, PurpleFox rootkit infections evading EDR with disabled memory scanning, and ClipBanker persistence via registry Run keys with Defender exclusions.
AI is not fundamentally changing adversary capabilities but is compressing attack timelines, lowering operational costs, and scaling existing tactics. Breakout times have dropped to an average of 29 minutes, with AI-enabled operations increasing 89% year-on-year. The most significant emerging threats are runtime-LLM malware (PROMPTSTEAL/LAMEHUG, QUIETVAULT) that query language models during execution, and agentic AI operations (GTG-1002) where AI agents conduct multi-stage intrusions with minimal human steering. Defenders face a dual pressure: faster attacks and an expanding attack surface from AI supply-chain dependencies.
Cisco Talos identified ARToken, a phishing-as-a-service platform linked to EvilTokens, that abuses Microsoft's OAuth 2.0 Device Authorization Grant to bypass MFA and capture victim tokens. The platform provides affiliates with a comprehensive post-compromise toolkit including PRT-based persistence surviving password resets, BEC email operations, inbox rule manipulation, and SharePoint exfiltration. ARToken deploys a sophisticated seven-layer client-side anti-analysis system and abuses legitimate sharepoint.com URLs from attacker-controlled Microsoft 365 workspaces to evade security scanners.
Gamaredon, a Russia-aligned APT group attributed to the FSB, maintained high operational tempo throughout 2025 with 35 spearphishing campaigns exclusively targeting Ukrainian government and military institutions. The group introduced six new PowerShell tools, resurrected the PteroSetup VBScript weaponizer for lateral movement, and began abusing CVE-2025-8088 (WinRAR) for persistence via the Startup folder. A significant infrastructure evolution occurred: C&C servers are now hidden behind tunnel services (Cloudflare tunnels, Cloudflare workers, Microsoft devtunnels, Loophole) and dead-drop resolutions on legitimate platforms (Telegram, Telegra.ph, Rentry, GoFile, Dropbox, and others), while stolen data is exfiltrated to S3-compatible cloud storage (Wasabi, Tebi, Intercolo) rather than attacker-owned servers.
AI Attacked and Abused While Perimeter Authentication Collapses
The month's defining shift was the emergence of AI as a two-sided battlefield: organizations deployed AI tools faster than they secured them, while attackers weaponized the same technology against defenders. Critical flaws in LangGraph allowed SQL injection chained to remote code execution, M365 Copilot could be turned into a one-click data exfiltration weapon via SearchLeak, and Langflow was exploited to deploy cryptominers. Meanwhile, the ongoing Shai-Hulud campaign injected prompts to blind AI malware scanners, macOS.Gaslight turned prompt injection against human analysts, and Russia's APT28 began experimenting with LLM-integrated malware. At the same time, perimeter authentication collapsed at scale: FortiBleed exposed credentials for over 73,000 FortiGate firewalls, CVE-2026-50751 let attackers bypass Check Point VPN authentication entirely, and ShinyHunters exploited an Oracle PeopleSoft zero-day across over 100 organizations.
Supply chain attackers followed developers to their new AI tools, compromising the ecosystems where code is written and built. The Shai-Hulud/Miasma worm expanded from npm into PyPI and injected persistent backdoors into AI coding assistant configurations, while North Korea's Sapphire Sleet compromised over 140 Mastra npm packages to steal cryptocurrency wallets, and the ongoing GlassWorm campaign pivoted to WebAssembly malware in VS Code extensions using the Solana blockchain as command-and-control. Social engineering also industrialized: the ErrTraffic framework turned ClickFix deception into a Malware-as-a-Service operation with blockchain dead drops, and EvilTokens hid phishing flows inside browser-side encryption to defeat network scanners while hijacking Microsoft device-code authentication.
Organizations should treat AI deployments as untrusted perimeter assets—restrict their network access, audit third-party skills and extensions, and assume prompt-injection attacks will target both automated scanners and human analysts. Every internet-facing VPN, firewall, and edge appliance should be patched immediately, with credentials rotated and phishing-resistant MFA enforced, because perimeter authentication failures now cascade directly into internal network compromise.
Legitimate Tools Hijacked as AI Becomes the New Battleground
The most damaging intrusions this week didn't rely on custom malware — they hijacked the legitimate tools and protocols organizations already trust. FortiBleed harvested real credentials from FortiGate firewall configurations worldwide, EvilTokens bypassed multi-factor authentication by abusing Microsoft's own device login flow, and a WhatsApp campaign installed legitimate ManageEngine remote management software to maintain persistent access.
Simultaneously, attackers are learning to manipulate the AI systems defenders increasingly depend on. The macOS.Gaslight malware feeds fake error messages to AI analysis tools to blind security analysts, malicious skills on the OpenClaw marketplace trick AI assistants into executing harmful commands, and researchers demonstrated that chatbot reconnaissance can map an organization's defenses through casual conversation.
Reset all FortiGate and VPN credentials immediately, scrutinize AI marketplace add-ons before installation, and assume that any legitimate-looking login prompt or remote management tool could be an attacker wearing a trusted disguise.
The StrikeShark campaign utilizes a novel malware family named SharkLoader to deploy Cobalt Strike Beacons across various global sectors. Threat actors gain initial access by exploiting known vulnerabilities in public-facing applications or distributing custom droppers disguised as legitimate software. SharkLoader employs advanced evasion techniques, including Perfect DLL Hijacking and extensive API hooking, to bypass loader locks and conceal its execution in memory.
A cryptocurrency-mining campaign is actively exploiting CVE-2026-33017, an unauthenticated RCE vulnerability in Langflow, to deploy the lambsys malware. The attack chain involves a bash dropper that establishes SSH-based lateral movement, followed by a Go-based payload that systematically disables Linux security controls, eliminates rival miners, and deploys a customized XMRig miner.
A critical vulnerability in the Google Cloud Vertex AI SDK for Python allows attackers to achieve cross-tenant Remote Code Execution (RCE) via bucket squatting. By predicting default staging bucket names and exploiting a lack of ownership verification, attackers can intercept model uploads and inject malicious pickle payloads, leading to the theft of highly privileged service account tokens.
Between 2024 and 2026, the Vietnam-aligned threat actor OceanLotus (APT32) shifted its focus toward domestic espionage, conducting a supply-chain attack against the FireAnt MetaKit stock investment platform and compromising a major infrastructure corporation. The campaigns leveraged DLL side-loading to deploy the SPECTRALVIPER backdoor, which features advanced orchestration capabilities and exfiltrates encrypted host data via HTTP Cookie headers.
Mandiant and Google Threat Intelligence Group identified an active extortion campaign by UNC6240 (ShinyHunters) exploiting CVE-2026-35273, a critical zero-day RCE vulnerability in Oracle PeopleSoft. The threat actors targeted the higher education sector, deploying customized MeshCentral agents for C2 and utilizing custom scripts for lateral movement, defacement, and data exfiltration.
The cyber risk landscape for 2026 is heavily influenced by regional conflicts, with PRC actors pre-positioning in critical infrastructure edge devices for strategic leverage. Russian actors are escalating hybrid warfare and OT/ICS disruption across Europe, while Iranian groups have decentralized to conduct wiper attacks and target cloud infrastructure. Concurrently, eCrime actors are exploiting these geopolitical tensions to deploy ransomware and infostealers, increasingly targeting hypervisors and industrial operations.
The financially motivated threat cluster UNC3753 is conducting a fast-paced data theft and extortion campaign against US legal and professional services. The group leverages vishing and IT helpdesk impersonation to trick targets into installing legitimate RMM and screen-sharing tools, enabling rapid data exfiltration from corporate repositories and VDI environments. Notably, the campaign also involves suspected physical intrusions where actors use USB media to steal data directly from endpoints.
Gamaredon (FSB) is conducting an ongoing cyberespionage campaign against Ukrainian targets using a modular, fileless infection chain. The attack leverages HTML smuggling and archive path traversal (CVE-2025-8088) for initial access, followed by the deployment of GammaWorm, which utilizes NTFS Alternate Data Streams (ADS) and Dead Drop Resolvers (DDRs) on legitimate platforms for persistence, propagation, and C2 communication.
Session Hijacking and Developer Tool Poisoning Collapse Authentication Trust
This week, attackers proved that multi-factor authentication is no longer a reliable gatekeeper. Campaigns like Tycoon 2FA and Chinese-language PhaaS platforms intercept one-time passwords in real time and steal session tokens to maintain persistent access, while infostealers like EKZ Infostealer harvest browser cookies to bypass authentication entirely. Even when victims reset passwords and revoke sessions, attackers retain access through hidden device registrations — meaning standard incident response playbooks are now incomplete.
Developers remain the preferred entry point for supply chain compromise. The Glassworm botnet was disrupted after hiding malware in VSCode extensions and npm packages, while the Megalodon campaign poisoned GitHub Actions workflows across 5,500 repositories. A malicious Sicoob.Sdk NuGet package stole banking certificates from Brazilian developers, and North Korea's Lazarus group compromised the widely used axios npm library — a single attack touching millions of downstream applications.
Organizations must move beyond password-and-MFA reliance: adopt hardware security keys, shorten session lifetimes, delete attacker-registered devices before resetting credentials, and audit developer toolchains and CI/CD pipelines for tampering.
The Gentlemen ransomware, operated by Storm-2697, is a Go-based encryptor that combines robust Curve25519/XChaCha20 encryption with aggressive lateral movement capabilities. It utilizes multiple redundant propagation methods (PsExec, WMI, scheduled tasks, services) to maximize network compromise while employing extensive defense evasion techniques to hinder detection and recovery.
Cybercriminals are shifting from traditional credential theft to session hijacking using infostealer malware, allowing them to bypass multi-factor authentication (MFA). By harvesting and replaying valid session tokens using automated tools, attackers gain rapid, stealthy access to corporate environments, which is then often monetized by Initial Access Brokers.
In May 2026, ANY.RUN observed a surge in sophisticated phishing and malware campaigns utilizing fileless execution, browser-based credential theft, and legitimate workflow abuse. Key threats included Agent Tesla credential harvesting, ClickFix fileless malware, BlobPhish in-memory page generation, and phishing-to-RMM chains bypassing traditional MFA via real-time OTP interception.
The TrapDoor campaign is a sophisticated supply chain attack targeting crypto, DeFi, and AI developers across npm, PyPI, and Crates.io. The threat actor deployed over 34 malicious packages that utilize ecosystem-specific execution methods to steal credentials, wallets, and SSH keys, while uniquely leveraging AI configuration files like .cursorrules to trick AI assistants into executing exfiltration workflows.
Frontier AI models such as Anthropic Mythos and OpenAI GPT 5.5 Cyber represent a paradigm shift in security testing by leveraging multi-step reasoning to chain vulnerabilities and misconfigurations into viable attack paths. Zscaler's evaluation demonstrates that these models significantly outperform legacy tools in speed and accuracy when embedded in structured testing harnesses, though they require careful contextual grounding to avoid severity inflation or pattern anchoring. Organizations are advised to implement Zero Trust architectures and deception technologies to mitigate the accelerated threat posed by AI-enabled adversaries.
The Cloud Atlas APT group has updated its toolset in 2025-2026 campaigns targeting Russia and Belarus, utilizing LNK-based phishing to deploy VBCloud and PowerShower backdoors. The group establishes persistent access by patching termsrv.dll for concurrent RDP sessions and heavily relies on reverse SSH, RevSocks, and Tor for redundant C2 channels. Additionally, a new PowerShell tool named PowerCloud is used to exfiltrate administrator data to Google Sheets.
Opportunistic threat actors continue to exploit exposed RDP, RDWeb, and vulnerable VPN configurations to gain initial access. Once inside, attackers deploy custom reverse tunnels, harvest credentials, and modify registry and firewall settings to establish persistent RDP access.
The China-aligned APT group Webworm has updated its toolset in 2025, shifting focus to European and South African targets. The group deployed two new custom backdoors, EchoCreep and GraphWorm, which abuse Discord and the Microsoft Graph API respectively for command and control. Additionally, Webworm utilizes a complex network of custom proxy tools and compromised infrastructure, including GitHub and Amazon S3, to stage payloads and exfiltrate data.
The article highlights the critical need for foundational security architecture before deploying AI at scale, emphasizing that AI amplifies risks associated with exposed attack surfaces and lateral movement. It advocates for Zero Trust principles to make AI models invisible to the internet and restrict unauthorized access paths, preventing minor compromises from becoming systemic breaches.
A recent phishing campaign impersonates Zoom meeting invitations to trick users into downloading a malicious VBS script disguised as a software update. This script silently installs ConnectWise ScreenConnect, a legitimate RMM tool, granting attackers persistent remote access to the compromised system for potential follow-on attacks such as credential theft, lateral movement, or ransomware deployment.
UNC6671, operating under the BlackFile brand, conducts sophisticated vishing and Adversary-in-the-Middle (AiTM) attacks to bypass MFA and compromise SSO platforms like Microsoft 365 and Okta. Once inside, the group uses automated Python and PowerShell scripts to rapidly exfiltrate sensitive data via APIs, often masking their activity as routine file access events, before launching aggressive extortion campaigns.
The Talos Threat Source newsletter highlights an impending surge in software patching driven by AI vulnerability discovery tools. It also contrasts state-sponsored espionage tactics—which leverage valid credentials and native tools to bypass traditional defenses—with commodity ransomware, while summarizing recent supply chain compromises across developer platforms like Hugging Face and Jenkins.
SentinelLABS discovered PCPJack, a cloud-focused worm designed to harvest credentials at scale while actively evicting artifacts of a rival threat actor, TeamPCP. The framework targets exposed cloud services like Docker, Kubernetes, and Redis for propagation and lateral movement, notably omitting cryptomining payloads in favor of credential theft and Sliver C2 deployment.
A recent leak of internal communications and backend data from 'The Gentlemen' RaaS operation has revealed the group's highly structured operational model and mature toolset. The threat actors actively exploit edge appliances and NTLM relay vulnerabilities for initial access, followed by extensive use of red-team tools and custom EDR evasion techniques to deploy their cross-platform ransomware.
A sophisticated threat actor compromised a third-party IT services provider to abuse legitimate HPE Operations Agent infrastructure, enabling stealthy execution and discovery. The attackers established persistence and harvested credentials using malicious network provider and password filter DLLs on domain controllers, while utilizing web shells and ngrok tunnels to maintain long-term, undetected access.
Active Directory Certificate Services (AD CS) is increasingly targeted by threat actors to achieve privilege escalation and persistence through misconfigured certificate templates and shadow credential abuse. By leveraging tools like Certipy and Whisker, attackers can bypass traditional credential defenses, necessitating behavioral detection strategies focused on LDAP enumeration, anomalous certificate issuance, and directory modifications.
Trend Micro identified two distinct threat campaigns, SHADOW-AETHER-040 and SHADOW-AETHER-064, leveraging agentic AI to orchestrate attacks against Latin American government and financial institutions. The attackers utilized AI models like Anthropic's Claude to dynamically generate scripts, analyze configurations, and establish SOCKS5 tunnels for lateral movement, demonstrating a shift towards AI-assisted, signature-evasive intrusion operations.
Cisco Talos identified UAT-8302, a China-nexus APT, targeting global government entities using a diverse toolkit of custom and shared malware. The threat actor leverages DLL side-loading to deploy implants like NetDraft, CloudSorcerer v3, and VSHELL, while utilizing open-source tools for extensive network reconnaissance, credential harvesting, and lateral movement.
A threat actor utilized compromised VPN credentials to access a partner network, pivoting via a customized Impacket smbexec.py to enable RDP and establish an interactive session. The attacker then installed the open-source monitoring tool Komari directly from GitHub, leveraging its native WebSocket capabilities as a persistent, SYSTEM-level command-and-control (C2) backdoor disguised as the Windows Update Service.
CORDIAL SPIDER and SNARKY SPIDER are executing rapid, SaaS-centric data theft and extortion campaigns by leveraging vishing and AiTM phishing pages. By capturing session tokens and authentication data, these actors bypass traditional endpoint defenses and pivot directly into SSO-integrated SaaS environments via the organization's Identity Provider (IdP).
The popular PyPI package 'lightning' was compromised in a supply chain attack affecting versions 2.6.2 and 2.6.3. The malicious package executes an obfuscated JavaScript payload via the Bun runtime to harvest cloud and developer credentials, poison GitHub repositories by impersonating Anthropic's Claude Code, and infect local npm packages.
SHADOW-EARTH-053 is a China-aligned cyberespionage campaign exploiting legacy N-day vulnerabilities in Microsoft Exchange and IIS servers to target government and defense sectors primarily in Asia. The threat actors utilize GODZILLA web shells for persistence and deploy ShadowPad implants via DLL sideloading, sharing significant operational overlaps with another intrusion set tracked as SHADOW-EARTH-054.
Attackers are increasingly targeting CI/CD pipelines to harvest secrets and pivot to production environments using techniques like workflow modification and privileged trigger exploitation. Elastic has released an open-source tool, cicd-abuse-detector, which leverages regex-based signal extraction and LLM analysis to detect suspicious pipeline changes during the pull request phase.
VECT 2.0 is a cross-platform (Windows, Linux, ESXi) Ransomware-as-a-Service that effectively functions as a wiper due to a critical cryptographic implementation flaw. Files larger than 128 KB are encrypted in chunks using raw ChaCha20-IETF, but the malware fails to save the required nonces for the first three chunks, rendering full data recovery impossible even if the ransom is paid.
The cybersecurity landscape is experiencing a shift towards industrialized exploitation driven by offensive AI and LLMs. These technologies act as orchestrators that rapidly discover vulnerabilities and generate exploits, necessitating defensive AI and behavioral analytics to counter machine-scale attacks.
Google Threat Intelligence Group identified UNC6692, a threat actor utilizing Microsoft Teams phishing and email bombing to deploy a custom modular malware suite. The attack chain leverages a malicious Chromium extension (SNOWBELT), a Python tunneler (SNOWGLAZE), and a Python bindshell (SNOWBASIN) to establish persistence, move laterally, and exfiltrate sensitive Active Directory data via legitimate cloud services.
Talos IR's Q1 2026 trends report highlights the resurgence of phishing as the primary initial access vector, heavily targeting public administration and healthcare. The quarter saw novel abuses of AI tools like Softr for credential harvesting, the emergence of the Crimson Collective extortion group leveraging valid accounts and TruffleHog, and Rhysida ransomware deploying the MeowBackConn backdoor.
The article details how threat actors can leverage native macOS binaries and protocols (Living-off-the-Land) to execute code, move laterally, and transfer tools while evading traditional security telemetry. By abusing Remote Application Scripting (RAS), Spotlight metadata, and built-in networking utilities, attackers can orchestrate fleet-wide compromises that bypass standard SSH-centric monitoring.
The Gentlemen is an emerging Ransomware-as-a-Service (RaaS) operation that provides affiliates with versatile, multi-platform lockers. Recent incident response telemetry reveals affiliates utilizing Cobalt Strike and SystemBC for post-exploitation and C2, culminating in highly automated, domain-wide ransomware deployment via Group Policy and built-in lateral movement mechanisms.
On April 19, 2026, Vercel disclosed a critical security breach originating from a compromised third-party AI tool, Context.ai. The threat actor, ShinyHunters, utilized an infostealer to harvest OAuth tokens, bypassed MFA to access Vercel's Google Workspace, and pivoted via SSO to bulk-extract customer environment variables containing highly sensitive cloud, database, and source code credentials.
In March 2026, 31 high-impact vulnerabilities were actively exploited, highlighted by the Interlock Ransomware Group leveraging a CVSS 10.0 zero-day in Cisco Secure FMC (CVE-2026-20131). The attackers utilized insecure Java deserialization to gain root access, deploying custom RATs, memory-resident web shells, and ransomware across enterprise networks.
The AWS Bedrock AgentCore starter toolkit automatically provisions overly permissive IAM roles that grant wildcard access across the AWS account. This "Agent God Mode" misconfiguration allows a compromised AI agent to exfiltrate ECR images, access other agents' memories, and escalate privileges by invoking other code interpreters or agents.
Storm-1175 is a financially motivated threat actor that rapidly exploits N-day and zero-day vulnerabilities in web-facing assets to deploy Medusa ransomware. The group utilizes a high-tempo attack chain, leveraging LOLBins, RMM tools, and credential theft to move laterally and exfiltrate data before executing ransomware, often completing the entire attack lifecycle within days.
The U.S. Department of Health and Human Services (HHS) Notice of Proposed Rulemaking (NPRM) emphasizes that healthcare organizations must move beyond basic HIPAA compliance to achieve true cybersecurity resilience. To combat the rising threat of ransomware, organizations are urged to implement continuous asset monitoring and microsegmentation to contain lateral movement, reduce the blast radius of attacks, and protect electronic protected health information (ePHI).
