Threats Tagged 'dll sideloading'

An active malware campaign utilizes fraudulent software-download websites impersonating trusted vendors to distribute malicious installers. The operation primarily targets China-based operations of multinational organizations and Chinese-speaking users across healthcare, manufacturing, gaming, technology, logistics, government, and education sectors. The malicious installers deploy malware capable of establishing persistence, disabling Windows Update services, configuring Microsoft Defender exclusions, deleting volume shadow copies, and establishing command-and-control communications. Microsoft attributes this activity with moderate confidence to the Chinese threat cluster Silver Fox, known for using spoofed vendor download pages to distribute remote access trojans. The campaign leverages high-fidelity clones of legitimate vendor websites hosted on Chinese domains, delivering server-side generated payloads through ZIP archives.

MediumMalwareChina#dll sideloading#silver fox trojan#fake installers

Analysis of server infrastructure revealed a complete TukTuk C2 framework (version 2.0) with cross-platform capabilities, including Windows and Linux agents, backend infrastructure, and management panel. The server contained eb.sys matching GentleKiller, along with comprehensive EDR neutralization training materials organized in four progressive lessons covering BYOVD techniques, vulnerable driver hunting, and kernel-level research. DLL sideloading configurations targeting Greenshot, ProcMon, Slack, and Postman were identified. Exfiltrated data included 224 Jira tickets from a global technology company containing information related to U.S. defense organizations and defense contractors, plus credentials from a global healthcare company's Infrastructure-as-Code platform exposing AWS keys, production databases, Azure AD, and Bitbucket access.

MediumMalwareUnited States#greenshot#tuktuk#jira exfiltration

ValleyRAT is a backdoor malware distributed disguised as legitimate Chinese adware called QN Wallpaper. It uses DLL sideloading to execute malicious code under a signed process. The malware includes capabilities such as keylogging, clipboard monitoring, screenshot capture, and module delivery. The campaign has impacted over 1,500 users mainly in China and India with over 100,000 detections in 2026. The Silver Fox threat group is attributed to this campaign. The malware disables Windows Defender, establishes persistence, and protects its processes by marking them critical to cause system crashes if terminated.

MediumMalwareBritish Indian Ocean TerritoryChinaIndia#qn wallpaper#valleyrat#adware disguise

The TerminalFix campaign is a sophisticated multi-stage intrusion targeting organizations via compromised websites that display fake Cloudflare CAPTCHA overlays. Victims are tricked into executing malicious PowerShell commands that download and execute a signed legitimate binary alongside a malicious DLL for sideloading. This leads to steganographic payload extraction, extensive Active Directory reconnaissance, and deployment of a Python-based reverse-tunnel implant providing persistent network-level proxy access. The campaign enables attackers to pivot within the network, conduct domain enumeration, and maintain stealthy persistent access. Although no direct downstream actions were observed, the access gained could facilitate privilege escalation, data exfiltration, and ransomware deployment. The campaign combines advanced evasion techniques and persistent network access, posing a serious threat to enterprise environments.

Multiple ClickFix malware campaigns have been identified using three delivery methods: MSI packages with DLL sideloading, NodeJS-executed JavaScript, and Python 3.5 payload execution. These campaigns use aggressive social engineering, including phone calls directing victims to compromised WordPress sites. Post-compromise activities include extensive system discovery and Active Directory enumeration. The campaigns share infrastructure and tactics linked to the Lorem Ipsum malware family and Vanilla Tempest adversary, with potential ransomware deployment as a final goal.

This threat describes a FakeAgent intrusion campaign discovered through an automated threat hunting agent within ten minutes. The campaign used malvertising on Bing to distribute trojanized Claude Desktop installers hosted on legitimate Anthropic infrastructure. The attack chain involved DLL sideloading via Java Chromium Embedded Framework, tampering with Microsoft Defender, scheduled task persistence disguised as Microsoft Edge updates, and blockchain-based command-and-control infrastructure using EtherHiding techniques. The intrusion deployed SectopRAT malware, which has infostealing and remote desktop capabilities, necessitating full endpoint reimaging and credential resets.

SilkParasite is a cyberespionage operation assessed with medium confidence as China-nexus that targeted government bodies across Central Asia. Seven remote access tool families were deployed, five of which were previously undocumented: DriveSilkRAT, CookiETagRAT, NomadRAT, GoginRAT, and NodeEdgeRAT. The toolset is small, modular, and professionally engineered with traces of AI-assisted development. Initial access occurred through malicious Microsoft Office documents delivered via spear-phishing, using regionally tailored lures impersonating government ministries. The operation leveraged DLL sideloading as the primary delivery mechanism and used Google Drive for command-and-control communications to hide within trusted services. Infrastructure analysis identified connections to China Unicom's backbone network, and operational patterns suggest a functioning software organization with maintained build pipelines and careful operational security.

MediumMalwareGeorgiaKazakhstanKyrgyzstan+4#dll sideloading#cookietagrat#china-nexus apt

Grandoreiro, a notorious banking trojan active since 2016 across Latin America, continues operations despite major law enforcement disruption in 2024. Recent campaigns leverage DLL sideloading techniques, abusing the legitimate Duplicate Files Finder application to execute malicious code. The loader incorporates extensive anti-analysis mechanisms including sandbox detection, virtual machine artifact checks, process blacklisting, and environment profiling to evade automated analysis systems. These defensive checks occur before C2 contact, indicating high priority on avoiding detection. Telemetry from June 2026 shows activity concentrated in Latin America, primarily Mexico, with limited presence in Europe and North America. The malware uses custom string obfuscation combining proprietary decryption with Base64 encoding, and communicates with C2 infrastructure over TCP port 6432 using encrypted requests containing host-specific information.

MediumMalwareMexicoSpain#sandbox evasion#grandoreiro#mexico

A phishing campaign targets Indian organizations by impersonating the Indian Income Tax Department. Victims receive emails containing links to spoofed notice pages that download ZIP archives. These archives include a legitimately signed Overwolf executable and two hidden files: a malicious DLL and an encrypted binary. When executed, the signed binary side-loads the malicious DLL through DLL hijacking. The DLL is UPX-packed and modified with Astral-PE, and decrypts the binary file containing ValleyRAT. The payload uses modified RC4 encryption with a 115-byte key and deploys entirely in memory. Once active, ValleyRAT establishes persistence through scheduled tasks masquerading as OneDrive entries, marks dropped files as hidden and system files, and performs process hollowing into svchost.exe to evade detection before connecting to command and control infrastructure.

MediumMalwareBritish Indian Ocean TerritoryIndia#india taxation phishing#upx packing#valleyrat

In July 2026, a new Rust-based malware family called C2Looper was identified, likely used by ransomware-related threat actors. The malware is assessed with low to medium confidence to be delivered through multi-stage ClickFix infection chains. C2Looper provides backdoor capabilities including remote shell execution, reconnaissance, and deploying additional payloads. It dynamically resolves Windows APIs and encrypts strings using XOR operations. The malware communicates via plaintext HTTP initially, but an evolved version uses GitHub repositories for command-and-control operations, storing commands and exfiltrated data in JSON files. Version 2 introduces additional commands such as reconnaissance collection, drive enumeration, shellcode injection, and file listing. The malware demonstrates active development with refined capabilities, likely serving initial access brokers for data theft and ransomware deployment.