38 posts
Backdoor.Mistic is a new stealthy backdoor deployed in cybercrime intrusions since April 2026, using DLL sideloading via legitimate MpExtMs.exe and masquerading as EndpointDlp.dll. It executes payloads in memory with a self-deleting kill switch, enabling long-term covert access. Mistic is likely linked to Woodgnat (aka KongTuke), an initial access broker whose ModeloRAT toolkit has been used in attacks delivering Qilin ransomware, connecting this backdoor to the broader ransomware ecosystem.
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.
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.
A widespread malware campaign is leveraging compromised WhatsApp accounts to distribute malicious VBScript files disguised as financial documents. The multi-stage infection chain abuses legitimate Windows utilities to download payloads, attempts to bypass UAC via registry modifications, and ultimately deploys a preconfigured ManageEngine Endpoint Central RMM agent to establish persistent remote access.
A newly discovered Windows loader, OXLOADER, is being distributed via malicious Google Ads impersonating Node.js to deliver the CASTLESTEALER infostealer. The loader utilizes advanced evasion techniques, including control-flow flattening, anti-sandbox checks, and staging shellcode within the .reloc section of a copied system DLL, to maintain low detection rates across static engines.
ThreatLabz identified a ClickFix campaign utilizing AI-generated typosquatting domains to impersonate Brazilian banks and deliver a PowerShell-based banking RAT dubbed SmartRAT. The malware establishes persistence via scheduled tasks or Windows services, communicates over a custom TCP protocol on port 51888, and features advanced capabilities including keylogging, fake banking overlays, and QR code interception for financial fraud.
Threat actors are leveraging short-form video platforms like TikTok and Instagram Reels to conduct social engineering campaigns. By posting fake tutorials for premium software and manipulating engagement algorithms, attackers trick users into executing malicious PowerShell commands that deploy Vidarstealer or direct them to fraudulent survey websites.
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.
A recent phishing campaign impersonates Amazon security alerts to deliver a custom remote access trojan (RAT) dubbed HarborWatch Agent. The attack leverages the ClickFix technique, using a fake CAPTCHA page to socially engineer victims into manually executing a malicious PowerShell command via the Windows Run dialog. Once executed, the script downloads the RAT, which collects system information and communicates with a C2 infrastructure managed via a panel called Harbor Sentinel.
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.
Gamaredon, a Russia-nexus threat actor, utilizes a multi-stage VBScript loader framework named GammaLoad to establish persistent access and deploy subsequent payloads like GammaSteel. The infection chain leverages Dead Drop Resolvers on legitimate platforms, stores C2 configurations in the Windows Registry, and uses Alternate Data Streams (ADS) combined with Scheduled Tasks for stealthy execution.
A newly discovered malware campaign dubbed Argamal targets users downloading adult games, utilizing DLL sideloading and COM hijacking to deploy a sophisticated Remote Access Trojan (RAT). The malware establishes persistence by hijacking the Windows Color System Calibration Loader and grants attackers full system control, including surveillance, file exfiltration, and arbitrary command execution.
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.
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.
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 Gentlemen ransomware operates as a Ransomware-as-a-Service (RaaS) model, utilizing affiliates who employ extensive defense evasion techniques. Recent incidents reveal attackers leveraging compromised RDP accounts, disabling Microsoft Defender via PowerShell, and establishing persistence through Scheduled Tasks that beacon to SOCKS proxy C2 servers.
A financially motivated eCrime campaign is leveraging SEO poisoning to impersonate AI coding assistants like Gemini CLI and Claude Code, tricking developers into executing a fileless PowerShell infostealer. The malware executes entirely in memory, disables Windows telemetry (ETW and AMSI), and harvests sensitive enterprise credentials, session tokens, and files before exfiltrating them to attacker-controlled infrastructure.
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.
Trend Micro MDR analyzed Banana RAT, a sophisticated banking trojan operated by SHADOW-WATER-063 targeting Brazilian financial institutions. The malware utilizes a server-side polymorphic build pipeline to deliver unique, AES-encrypted PowerShell payloads that execute filelessly in memory. Once active, it enables operator-driven fraud through remote input control, keylogging, deceptive banking overlays, and a specialized Pix QR code interception subsystem.
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.
Kazuar is a sophisticated, modular P2P botnet attributed to the Russian state-sponsored actor Secret Blizzard. It utilizes a tripartite architecture (Kernel, Bridge, Worker) and a leader election mechanism to minimize external C2 traffic, relying on Mailslots, Window Messaging, and Named Pipes for internal communication and HTTP, WSS, or EWS for external C2.
FrostyNeighbor, a Belarus-aligned threat actor, has updated its toolset to target Ukrainian governmental organizations with a multi-stage compromise chain. The attack utilizes spearphishing with malicious PDFs that redirect to a RAR archive containing a JavaScript dropper, which ultimately deploys a Cobalt Strike beacon via the PicassoLoader malware following strict server-side and manual victim validation.
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.
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.
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.
Arctic Wolf Labs identified a highly targeted campaign by the DPRK-nexus threat actor BlueNoroff against the Web3 sector. The attackers utilize sophisticated social engineering, including AI-generated deepfakes and stolen webcam footage, to lure victims into fake Zoom or Teams meetings. Once engaged, a ClickFix clipboard injection attack deploys a fileless PowerShell C2 implant, leading to the theft of cryptocurrency wallets, browser credentials, and Telegram sessions.
Threat actors are leveraging social media platforms, SEO poisoning, and AI agent responses to distribute ClickFix-style attacks disguised as tech tips. Victims are socially engineered into executing malicious PowerShell commands that initiate a fileless infection chain, bypassing traditional security controls to deploy information stealers like Vidar on their endpoints.
A sophisticated phishing campaign is abusing Google Cloud Storage to host fake Google Drive login pages, harvesting credentials before delivering the Remcos RAT. The attack employs a complex, multi-stage execution chain using JavaScript, VBScript, and PowerShell to perform process hollowing on the legitimate RegSvcs.exe binary, allowing the malware to operate stealthily in memory.
A critical supply chain attack compromised the official Axios npm package, deploying malicious versions v1.14.1 and v0.30.4. The packages contained a fake runtime dependency that automatically executed post-install, downloading platform-specific Remote Access Trojans (RATs) to Windows, MacOS, and Linux systems to facilitate credential exfiltration and remote access.
March 2026 saw a surge in sophisticated, multi-stage cyber attacks designed to evade early detection. Key threats included OAuth device code phishing (EvilTokens) for M365 account takeover, registry-hidden RAT staging (RUTSSTAGER), macOS backdoors delivered via ClickFix lures, and resilient botnets utilizing Dead Drop Resolvers.
Ransomware tactics in 2025 have shifted heavily toward 'Living off the Land' (LotL) techniques, with threat actors leveraging valid accounts and built-in administrative tools like RDP, PowerShell, and PsExec to evade detection. Qilin has emerged as the most prolific ransomware group, utilizing double-extortion tactics, while manufacturing remains the most targeted industry.
The highly popular Axios npm package was compromised when an attacker hijacked a lead maintainer's account to publish malicious versions. These versions included a phantom dependency that deployed a cross-platform Remote Access Trojan (RAT) via a postinstall hook, utilizing advanced obfuscation and anti-forensic techniques to hide its presence. The attack highlights critical risks in the software supply chain, specifically regarding dependency resolution and CI/CD pipeline protections.
Insikt Group identified five distinct threat clusters utilizing the ClickFix social engineering technique to trick users into manually executing malicious commands via native system tools. This living-off-the-land approach bypasses traditional browser security to deliver payloads like NetSupport RAT and macOS infostealers across both Windows and macOS environments.
A targeted campaign is delivering the PureLog Stealer via localized copyright violation lures. The attack employs a sophisticated multi-stage infection chain, utilizing a Python-based loader to bypass AMSI, establish registry persistence, and execute the final .NET stealer entirely in memory to evade detection.
Handala Hack, an Iranian MOIS-affiliated threat actor also known as Void Manticore, conducts destructive wiping and hack-and-leak operations against US, Israeli, and Albanian targets. The group leverages compromised VPN credentials for initial access, uses NetBird for internal tunneling, and deploys multiple parallel wiping techniques—including custom MBR wipers, PowerShell scripts, and VeraCrypt—distributed via Active Directory Group Policy.
Trend Micro MDR uncovered an ongoing campaign by the KongTuke threat group utilizing compromised WordPress sites and fake CAPTCHA lures to trick users into executing malicious PowerShell commands. The attack leverages living-off-the-land binaries like finger.exe to deploy a Python-based backdoor known as modeloRAT, which focuses on enterprise environments for potential lateral movement and establishes persistence via scheduled tasks and registry keys.
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.
