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Researchers identified a TrickBot variant for Microsoft Windows that replaces its usual HTTP command-and-control channel with a custom DNS tunneling mechanism, allowing the malware to hide outbound tasking in malformed DNS queries and reconstruct inbound data from IPv4 addresses returned in DNS responses. Fortinet said the malware sends XOR-encrypted, hex-encoded command data in chunks designed to resemble legitimate domain labels, with traffic observed via 8.8.8.8 and a command-and-control domain of westurn.in. The transport redesign preserves TrickBot’s modular architecture while making communications harder to detect and block.
The malware maintains persistence through Windows Task Scheduler, with tasks configured to run every five minutes, and stores task metadata in NTFS Alternate Data Streams to reduce visibility. Fortinet reported the variant also uses encrypted strings and hash-based runtime API resolution to complicate analysis, while retaining capabilities for module download, rundll32-based execution, PowerShell execution, direct machine-code execution, process hollowing, and process doppelgänging. Researchers measured the DNS tunnel at roughly 30.7 KB/s, indicating the channel is practical for sustained covert command-and-control operations.
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Fortinet FortiGuard Labs analyzed a TrickBot variant for Windows that replaces HTTP command-and-control with a custom DNS tunneling mechanism. The research identified persistence via Windows Task Scheduler, ADS-stored task metadata, encrypted strings and hash-based API resolution, and the C2 domain westurn.in along with six associated sample hashes.
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Researchers and government agencies reported that **TrickBot** continued to evolve from a banking trojan into a modular crimeware platform used for credential theft, lateral movement, data exfiltration, and delivery of follow-on malware including **Ryuk** and **Conti** ransomware. Observed delivery chains included spearphishing lures themed as COVID-19 alerts, invoices, and traffic violations, with victims receiving encrypted Word macro documents or downloading malicious JavaScript from compromised websites. In one campaign, password-protected `.docm` files used an `AutoOpen` macro to extract hidden VBScript, write a `.VBE` file to `C:\ProgramData`, rebuild a TrickBot DLL, decode it with `certutil`, and execute it through `regsvr32.exe`, helping the malware evade static and behavioral detection. TrickBot operators also updated internal tooling and infrastructure to improve stealth and spread. Palo Alto Networks documented the replacement of the older **`mworm`** propagation module with **`nworm`**, which fetched an encrypted payload over HTTP and executed it **in memory** on vulnerable Active Directory domain controllers, reducing forensic artifacts and avoiding persistence after reboot. Other reporting tied TrickBot infrastructure to leaked configuration data and IP addresses associated with **MikroTik** routers, suggesting use of compromised network devices in command-and-control operations. Across the reporting, defenders were urged to hunt for campaign-specific **gtag** identifiers, Office encryption artifacts, characteristic byte-level document changes, suspicious SMB activity including exploitation of **`CVE-2017-0144`**, and phishing-driven execution chains that lead to TrickBot installation.
Aug 15, 2026
Researchers reported that **TrickBot** evolved well beyond its origins as a banking trojan into a modular intrusion platform used for credential theft, lateral movement, and ransomware operations. Earlier campaigns delivered TrickBot through phishing lures such as fake payroll emails, malicious ZIP files, Windows shortcut downloaders, and macro-enabled Word documents, often abusing legitimate services including SendGrid, Google Docs, and Google Drive. Once installed, the malware established persistence through scheduled tasks or the Windows Startup folder, used process hollowing and `rundll32.exe` for execution, collected system and browser data, and fetched additional modules for password theft, network reconnaissance, and command-and-control activity. The malware’s role in larger enterprise attacks became more serious as defenders linked TrickBot activity to **Ryuk** and later **Conti** ransomware operations, as well as Anchor-related payload delivery through modules such as **mexec**. Network analysis showed TrickBot using HTTPS/TLS command-and-control on uncommon ports, HTTP exfiltration, and even lateral movement to domain controllers via SMB exploitation. Eclypsium and AdvIntel also disclosed a new **TrickBoot** module that probes Intel-based systems for UEFI/BIOS write protections and firmware weaknesses, creating a potential path for stealthy persistence in SPI flash or destructive device bricking, marking a significant escalation from conventional malware delivery to firmware-level attack capability.
Aug 15, 2026
**TrickBot** was updated to abuse Windows User Account Control on multiple versions of Windows, letting the malware launch with elevated privileges without showing a visible prompt. Researchers reported that the trojan used the **`fodhelper.exe`** auto-elevation technique on Windows 10 and **CMSTPLUA** on Windows 7, then quickly shifted to a newer Windows 10 bypass that abused **`wsreset.exe`** through registry changes under **`HKCU\Software\Classes`**. The changes allowed TrickBot to run more quietly, evade user suspicion, and weaken host defenses while maintaining administrative access. The malware’s expanded privilege-escalation capability supported a broader credential-theft and post-compromise toolkit already seen in earlier TrickBot campaigns. Fortinet’s analysis of the **`pwgrab`** module showed TrickBot stealing saved passwords, browser data, autofill information, and credentials from applications including **Outlook**, **FileZilla**, and **WinSCP**, while persisting through scheduled tasks and exfiltrating data over HTTP. Reporting also noted TrickBot’s ability to spread laterally, target Active Directory data on domain controllers, and provide access that could later be used to deploy **Ryuk ransomware**.
Aug 15, 2026