DLL Sideloading

2026-07-0613 minCheck Pointhigh

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.

DragonForce ransomware operators deployed a novel Go-based backdoor called Backdoor.Turn that abuses Microsoft Teams TURN relay infrastructure to hide C2 traffic as legitimate Teams communications. The attack chain involves SQL/MSSQL server exploitation for initial access, DLL sideloading via VirtualBox/DbgView executables, multiple BYOVD techniques for defense evasion including a novel exploit of a Huawei driver, and ultimately DragonForce ransomware deployment. The group demonstrated exceptional sophistication with custom tooling and stealth techniques that evade standard network monitoring.

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.

LevelBlue GSOC has identified accelerating ValleyRAT campaigns delivered through fake installers and malicious emails targeting Chinese and Japanese-speaking users. The email-based attack chain uses DLL sideloading via a legitimate VLC executable to load a malicious DLL that downloads an RC4-encrypted, Donut-generated ValleyRAT payload, which is then injected into a suspended rundll32.exe process for fileless execution. The malware incorporates extensive anti-analysis checks (memory size, sleep timing, CPU count, VHD boot detection) and establishes persistence via registry Run keys.

ToddyCat APT developed a tool called Umbrij that automates the theft of Google OAuth authorization codes by launching Chromium-based browsers in headless mode with remote debugging ports enabled. The tool copies the victim's browser profile to a backup directory, launches the browser invisibly with the stolen session, and uses Puppeteer Sharp to automate the Google OAuth consent flow using legitimate Google Workspace Migration/Sync client IDs. The resulting authorization code is exfiltrated and exchanged for an access token, enabling API-level access to the victim's Gmail, Drive, Calendar, and Contacts without traditional credential theft.

A large-scale campaign abuses the legitimate ScreenConnect remote management tool, distributed via 90+ spoofed freeware download sites using SEO poisoning, to silently deploy AsyncRAT. The attack uses DLL sideloading via a Microsoft-signed install.exe binary, followed by a multi-stage loader chain involving PowerShell and VBScript scripts that disable Defender, bypass UAC, and ultimately inject AsyncRAT into RegAsm.exe via process hollowing. The campaign targets both consumers and corporate networks across multiple languages and regions.

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.

2026-06-165 minMorphisechigh

Morphisec researchers identified a significantly evolved version of the BabaDeda loader targeting the education and financial sectors. The campaign leverages ClickFix social engineering to trick users into executing PowerShell commands, leading to a complex, multi-stage infection chain involving DLL sideloading, in-memory execution, and external payload storage to deliver DanaBot and SectopRAT.

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.

A cybercrime campaign is targeting users of pirated media sites with a fake video player update that deploys a modified SilentCryptoMiner and a Remote Access Trojan (RAT). The malware utilizes DLL side-loading, DNS tunneling for initial check-ins, and a DGA for C2 communications, while employing a Watchdog component to ensure persistence via a rogue Google Update service.

2026-05-267 minTrend Microhigh

Threat actors behind the ClearFake campaign are leveraging EtherHiding to host malicious JavaScript payloads within BNB Smart Chain testnet smart contracts, bypassing traditional URL-based blocking. The attack chain begins with a compromised watering hole site and uses a ClickFix social engineering overlay to trick Windows and macOS users into executing malicious commands. This leads to the deployment of SectopRAT and ACRStealer via WebDAV DLL loading and DLL sideloading, enabling extensive credential and browser session theft.

The China-aligned threat actor UTA0388 is leveraging Large Language Models (LLMs) to conduct highly tailored, rapport-building spear-phishing campaigns targeting organizations in North America, Asia, and Europe. These campaigns deliver GOVERSHELL, a custom backdoor deployed via DLL search order hijacking, which has undergone rapid, non-iterative development across five variants to evade detection and establish persistent C2.

2026-05-227 minPalo Alto Networkshigh

Unit 42 identified an active cyberespionage campaign by the Iran-nexus APT group Screening Serpens, targeting entities in the U.S., Israel, and the Middle East. The threat actor deployed two new RAT families, MiniUpdate and MiniJunk V2, utilizing advanced AppDomainManager hijacking and DLL sideloading to evade native .NET security mechanisms like ETW. The attacks rely on highly tailored social engineering lures, such as fake job portals and video conferencing updates, to initiate the infection chain and establish persistent command and control.

2026-05-137 minElastic Security Labshigh

Elastic Security Labs identified TCLBANKER, a new Brazilian banking trojan distributed via DLL sideloading that features robust anti-analysis mechanisms and environment-gated payload decryption. The malware deploys a full-featured banking trojan with a WPF-based social engineering overlay framework, alongside worm modules that self-propagate by hijacking WhatsApp Web sessions and Microsoft Outlook accounts.

2026-05-136 minSophoshigh

A malvertising campaign is leveraging a fake Claude AI website to distribute a malicious MSI installer. The infection chain employs DLL sideloading via a legitimate G DATA executable to execute DonutLoader, which ultimately deploys a novel backdoor dubbed 'Beagle' for remote command execution and file manipulation.

2026-05-136 minZscaler ThreatLabzhigh

Threat actors are exploiting the OpenClaw AI agent framework by publishing a deceptive 'DeepSeek-Claw' skill that distributes malware. The campaign utilizes malicious installation instructions to deploy Remcos RAT on Windows via DLL sideloading and GhostLoader on macOS/Linux via obfuscated Node.js scripts, enabling persistent access and data exfiltration.

2026-05-139 minCisco Taloscritical

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.

2026-05-137 minTrend Microhigh

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.

2026-05-137 minSophoscritical

Threat actors are actively abusing the QEMU hardware emulator to create hidden virtual machines on compromised hosts, effectively shielding their attack toolkits from endpoint detection and response (EDR) solutions. Recent campaigns, including those linked to the PayoutsKing ransomware group, leverage this technique alongside vulnerability exploitation and legitimate remote access tools to establish persistence, harvest credentials, and exfiltrate data.

2026-05-136 minCisco Taloshigh

Cisco Talos identified a new threat actor, UAT-10362, targeting Taiwanese organizations with a sophisticated Lua-based malware suite named LucidRook. The attack leverages spear-phishing, DLL sideloading, and compromised FTP servers to deliver staged Lua bytecode payloads while employing strict geo-fencing to evade analysis.

2026-05-135 minCheck Pointcritical

Check Point Research discovered a zero-day vulnerability (CVE-2026-3502) in the TrueConf client update mechanism, exploited in 'Operation TrueChaos' against Southeast Asian governments. Attackers compromised on-premises TrueConf servers to distribute malicious updates, utilizing DLL sideloading and UAC bypass techniques to deploy the Havoc C2 framework.

2026-05-135 minElastic Security Labshigh

Elastic Security Labs identified a cyberattack targeting a South Asian financial institution using two custom malware strains: BRUSHWORM and BRUSHLOGGER. BRUSHWORM functions as a backdoor and USB worm capable of extensive file theft and air-gap bridging, while BRUSHLOGGER captures system-wide keystrokes via DLL side-loading.

2026-05-137 minPalo Alto Networkscritical

Unit 42 identified a coordinated cyberespionage campaign targeting a Southeast Asian government entity, involving three distinct China-aligned threat clusters. The attackers utilized a variety of tools including USB worms, custom loaders, and multiple remote access Trojans (PUBLOAD, Masol, Gorem, FluffyGh0st) to establish persistent access, evade detection via DLL sideloading, and exfiltrate sensitive data.

2026-05-138 minTrend Microcritical

The Warlock ransomware group (Water Manaul) has enhanced its attack chain by exploiting Microsoft SharePoint servers for initial access and deploying a sophisticated post-exploitation toolkit. The group leverages BYOVD techniques via the NSecKrnl.sys driver to disable security tools, establishes redundant C&C channels using legitimate tools like Velociraptor and Cloudflare Tunnels, and automates ransomware deployment domain-wide using Group Policy Objects (GPO).

2026-05-137 minZscaler ThreatLabzhigh

A China-nexus threat actor, assessed with medium confidence as Mustang Panda, targeted the Persian Gulf region using a multi-stage attack chain themed around the Middle East conflict. The campaign leverages LNK and CHM files to execute a heavily obfuscated shellcode loader via DLL sideloading, ultimately deploying a PlugX backdoor capable of HTTPS and DNS-over-HTTPS (DoH) C2 communications.

2026-05-136 minZscaler ThreatLabzhigh

Threat actors are capitalizing on Middle East geopolitical tensions using over 8,000 newly registered domains to launch opportunistic cyber attacks. Campaigns include Mustang Panda deploying the LOTUSLITE backdoor via DLL sideloading, fake news sites distributing StealC malware, and various phishing/scam operations exhibiting Persian-language artifacts.

2026-05-137 minPalo Alto Networkshigh

Since 2020, a Chinese threat actor tracked as CL-UNK-1068 has targeted critical infrastructure in Asia for cyberespionage. The group utilizes a diverse, cross-platform toolkit including web shells, custom Go-based scanners, modified Fast Reverse Proxy (FRP) for tunneling, and legacy Python executables for DLL side-loading to maintain stealth, escalate privileges, and exfiltrate sensitive data.

2026-05-138 minArctic Wolfhigh

Between January 2025 and January 2026, the India-nexus threat actor SloppyLemming conducted a cyber espionage campaign targeting government and critical infrastructure in Pakistan and Bangladesh. The campaign utilized PDF and Excel lures to deploy two custom implants—an in-memory shellcode backdoor named BurrowShell and a Rust-based keylogger—via DLL search order hijacking and extensive abuse of Cloudflare Workers infrastructure.

2026-05-137 minArctic Wolfcritical

Arctic Wolf Labs has identified a cyber espionage campaign by the Chinese-affiliated threat actor UNC6384 targeting European diplomatic entities. The campaign exploits the ZDI-CAN-25373 Windows shortcut vulnerability to deliver malicious LNK files, ultimately deploying the PlugX RAT via DLL side-loading of legitimate Canon printer utilities.