Firefox

UNK_DeadDrop is a likely North Korean threat actor conducting broad phishing campaigns targeting software developers with fake job offers and code review requests. The campaign delivers malicious GitHub/GitLab repositories that abuse VS Code and Cursor IDE task automation to silently execute cross-platform malware. Linux and macOS systems receive the Overlord Go RAT with custom credential and wallet theft modules, while Windows runs a fileless Node.js/Python pipeline inside the editor's Electron process. The malware exfiltrates cryptocurrency wallets, browser credentials, and OS keychain data to a hardcoded C&C server at 23.137.105.75:5173.

The Armored Likho APT group deploys a previously undocumented Python-based infostealer called BusySnake Stealer against government agencies and electric power sector organizations in Russia, Brazil, and Kazakhstan. The malware uses PyArmor Pro obfuscation, AI-generated first-stage loaders hosted on GitHub, and a modular C2 architecture to steal browser credentials, cookies, cryptocurrency wallets, 2FA secrets, Telegram data, and screenshots. The campaign demonstrates evolving TTPs including in-memory Python script execution, COM-based scheduled task persistence, and integrated reverse SSH tunneling that receives keys directly from the C2 server.

2026-07-0211 minSockethigh

Malicious Chrome and Firefox browser extensions masquerading as free VPN tools ('VPN Go: Free VPN') were distributed via official extension marketplaces and later updated to include clipboard-stealing functionality. The extensions monitor clipboard contents on a timer, chunk copied text into ~1000-character segments, and exfiltrate data via HTTP GET requests to hardcoded attacker-controlled IP addresses using a /html/continue.php endpoint with uid, part, total, and data query parameters. Both extensions share infrastructure, code patterns, and build artifacts, confirming a common threat actor. The staged update pattern—initial versions functioning as legitimate proxy tools with later versions adding clipboard theft—highlights the risk of extension update supply chain compromise.

2026-07-0112 minMicrosofthigh

StealC is a C++ malware-as-a-service infostealer that harvests credentials, cookies, and session tokens from browsers, email clients, crypto wallets, and gaming platforms, using APC injection to bypass Chromium App-Bound Encryption. Amadey is a modular MaaS loader that delivers StealC and other payloads through a rich backdoor command set including process injection, SOCKS proxying, RDP enablement, and hidden admin account creation. Microsoft DCU disrupted over 200 C2 domains and IPs associated with both threats in a coordinated action with Europol on June 24, 2026.

2026-07-016 minCanadian Centre for Cyber Securitycritical

The Canadian Centre for Cyber Security published a daily advisory digest on 2026-06-30 covering four security advisories for SimpleHelp, wolfSSL, Mozilla Firefox, and Citrix NetScaler ADC/Gateway. The most urgent item is CVE-2026-48558 in SimpleHelp, which has been added to CISA's KEV Database, indicating active exploitation. Citrix NetScaler ADC and Gateway also have multiple critical vulnerabilities across versions 13.1 and 14.1 that require immediate attention.

2026-06-245 minSentinelOnehigh

SentinelLABS identified macOS.Gaslight, a DPRK-aligned Rust backdoor targeting macOS systems. The implant establishes a resilient C2 channel via the Telegram Bot API using AES-GCM over pinned TLS and achieves persistence via a masqueraded LaunchAgent. Notably, it embeds a 38-message prompt-injection payload designed to feed fabricated system errors to LLM-assisted triage tools, aiming to abort or corrupt automated analysis. The malware also stages a standalone Python environment to execute a credential and data stealer.

2026-06-087 minTrend Microcritical

Multiple Russia-aligned threat actors, including SHADOW-EARTH-066 and Earth Dahu, are actively exploiting a patched WinRAR path traversal vulnerability (CVE-2025-8088) to target Ukrainian organizations. The attackers use crafted RAR archives with NTFS Alternate Data Streams to silently drop malicious payloads, such as the evolved GIFTEDCROOK infostealer or HTA-based espionage tools, into the Windows Startup folder and ProgramData directories.

2026-06-038 minCheck Pointhigh

Check Point Research uncovered a large-scale malware distribution ecosystem that uses search engine optimization and impersonated open-source project sites to drive traffic to a sophisticated Traffic Distribution System (TDS). The TDS employs click hijacking and strict gating to selectively deliver malware, including the SessionGate loader, RemusStealer, and AnimateClipper, while actively evading automated analysis through one-time key releases and file inflation.

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.

2026-05-276 minArctic Wolfcritical

Threat actors exploited CVE-2026-35616, an improper access control vulnerability in FortiClient EMS, to deploy a novel credential stealer named EKZ Infostealer to managed endpoints. The attackers abused legitimate VPN scripting workflows to execute malicious PowerShell commands that downloaded the stealer, which subsequently harvested browser credentials and exfiltrated them to a threat-actor-controlled server.

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.

2026-05-146 minANY.RUNhigh

An 18-month Agent Tesla campaign is targeting LATAM enterprises, particularly in Chile, using procurement-themed phishing lures. The attack chain employs a multi-stage loader protected by .NET Reactor 6.x, utilizing process hollowing into aspnet_compiler.exe to execute the credential-stealing payload entirely in memory. Stolen data is exfiltrated via cleartext FTP to compromised legitimate infrastructure.

2026-05-134 minCanadian Centre for Cyber Securityhigh

The Canadian Centre for Cyber Security published a daily advisory digest on May 12, 2026, highlighting critical security updates from SAP, Siemens, Schneider Electric, Ivanti, and Mozilla. The advisories cover a wide range of enterprise software, industrial control systems, and web browsers, requiring immediate patching to mitigate potential exploitation.

2026-05-137 minSocketcritical

A supply chain attack utilizing five malicious NuGet packages typosquatting Chinese .NET libraries has been discovered distributing a cross-platform infostealer. The malware leverages .NET Reactor and JIT hooking via module initializers to execute automatically upon assembly load, targeting credentials and cryptocurrency wallets across developer workstations and CI/CD pipelines.

2026-05-134 minCanadian Centre for Cyber Securitycritical

The Canadian Centre for Cyber Security released a daily digest highlighting five security advisories. Notably, Ivanti Endpoint Manager Mobile (EPMM) contains an actively exploited vulnerability (CVE-2026-6973), and critical updates were issued for Spring Cloud Config, VM2 Node.js library, Mozilla Firefox, and multiple Broadcom VMware Tanzu products.

2026-05-137 minHuntresshigh

A ClickFix social engineering campaign tricks users into executing a malicious command via a fake CAPTCHA on fraudulent background removal websites. This command uses the legacy finger.exe utility to download CastleLoader, an advanced Python-based loader that employs reflective PE loading and API evasion (such as ReplaceTextW hooking) to deploy NetSupport RAT and a custom .NET stealer (CastleStealer) for credential and data exfiltration.

2026-05-133 minZscaler ThreatLabzhigh

The emergence of frontier AI models like Claude Mythos enables autonomous, machine-speed vulnerability discovery and exploit generation, rendering traditional patch-management cycles obsolete. Security leaders must adopt converged exposure management, automated response playbooks, and Zero Trust architectures to contextualize risk and reduce the reachable attack surface.

2026-05-133 minCanadian Centre for Cyber Securityhigh

The Canadian Centre for Cyber Security released a daily digest highlighting recent security advisories from SmarterTools, Zyxel, Citrix, and Mozilla. Notably, Zyxel addressed command injection vulnerabilities across various networking devices, while the other vendors released standard security updates for their respective software products.

2026-05-132 minCanadian Centre for Cyber Securitymedium

The Canadian Centre for Cyber Security issued an advisory regarding multiple vulnerabilities in Mozilla Firefox and Firefox ESR. Organizations are urged to update their browser deployments to Firefox 150, Firefox ESR 115.35, or Firefox ESR 140.10 to ensure protection against potential security risks.

2026-05-134 minSocketcritical

The lead maintainer of the widely used Axios npm package fell victim to a sophisticated social engineering attack. Attackers tricked the maintainer into installing a Remote Access Trojan (RAT) during a fake MS Teams meeting, enabling session hijacking that bypassed 2FA and allowed the unauthorized publication of malicious Axios versions to the npm registry.

2026-05-135 minZscaler ThreatLabzhigh

SnappyClient is a newly discovered C++ C2 framework implant delivered via HijackLoader, primarily designed for cryptocurrency theft and remote access. It utilizes advanced evasion techniques such as AMSI patching, Heaven's Gate, and transacted hollowing to bypass security controls, including Chromium's App-Bound Encryption, while communicating over a custom ChaCha20-Poly1305 encrypted protocol.

2026-05-136 minSophoshigh

Threat actors are evolving 'ClickFix' social engineering campaigns to target macOS users with the MacSync infostealer. Recent iterations bypass traditional security controls by tricking users into executing obfuscated terminal commands that deploy fileless, API-gated AppleScript payloads designed to harvest credentials, browser data, and cryptocurrency wallet seed phrases.

2026-05-136 minTrend Microhigh

A new information stealer named BoryptGrab is being distributed through deceptive GitHub repositories that masquerade as legitimate software tools. The malware employs complex infection chains involving DLL side-loading, VBS downloaders, and encrypted payloads to deliver the stealer alongside additional backdoors like TunnesshClient and HeaconLoad.