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Researchers reported a renewed Rovnix malware campaign that used coronavirus-themed documents referencing a World Bank initiative to lure victims into opening a self-extracting archive. The package delivered a decoy file alongside a dropper that unpacked updated Rovnix-derived components, then used a UAC bypass based on a fake trusted directory and DLL hijacking via wusa.exe and a malicious wtsapi32.dll to gain execution while evading defenses.
The malware then installed a bootkit by overwriting the VBR, deployed the KLoader driver to inject a loader into running processes, and sent XOR-encrypted system data to command-and-control servers. Researchers also identified related loader variants that reused the same privilege-escalation technique without the bootkit, as well as payloads that acted as a backdoor capable of executing files, recording microphone audio, and rebooting or shutting down infected systems, indicating that leaked Rovnix source code had been adapted into a more modern intrusion toolset.
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In mid-April 2020, threat monitoring systems detected malicious files distributed under a Russian-language lure about a World Bank initiative related to the coronavirus pandemic. The files, delivered as EXE or RAR archives, contained the Rovnix bootkit.
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Researchers analyzed an updated **Rovnix** bootkit framework variant, **Rovnix.D**, that continues the malware family’s use of NTFS VBR infection to load unsigned kernel-mode drivers on 64-bit Windows systems. The newer samples include `BkSetup.dll` version **2.4** and show revised polymorphic bootstrap code, modified malicious VBR storage, and updated driver decryption routines designed to make detection and analysis harder. The refreshed framework also adds support for downloading multiple payloads from command-and-control infrastructure, with the payload communicating through a malicious driver and hidden storage before reaching out to **`rtttt-windows.com`**. Researchers assessed the changes as evolutionary rather than a full redesign, but said the updates appear aimed at improving antivirus evasion and keeping the bootkit viable for renewed criminal use, including possible botnet-for-rent operations.
Aug 14, 2026
Researchers analyzed multiple **COVID-themed Windows malware** samples, including **CoViper** and **Covid22**, that use pandemic-related lures before deploying destructive components that overwrite the **Master Boot Record (MBR)** and leave systems unable to boot. In the CoViper case, a PureBasic installer drops several files, creates a hidden `%HOMEDRIVE%\COVID-19` folder, establishes persistence, disables Task Manager and some UAC protections, changes the wallpaper and cursor, and repeatedly displays a nuisance GUI. Its `end.exe` payload reads `\\.\PhysicalDrive0`, replaces the MBR with attacker code, and shows a taunting message on reboot, with language-specific text for German systems. Fortinet reported a related sample, **Covid22**, posing as a fake installer and dropping `WipeMBR.exe`, which overwrites the first 512 bytes of the MBR without encrypting or stealing files, making the malware destructive but not ransomware. Analysts noted CoViper also backs up the original MBR and contains a hidden recovery shortcut using **CTRL+ALT+ESC**, suggesting unfinished development or experimentation. Defenders were provided hashes, YARA rules, and recovery guidance, including Windows repair options and the command: ```cmd bootrec.exe /fixmbr ```
Aug 15, 2026
Multiple active malware campaigns are using **trojanized installers** and social engineering—rather than software vulnerabilities—to gain initial access and then deploy credential theft or remote-control capabilities. Intel 471 reported a new Android banking trojan dubbed **FvncBot** targeting Polish mobile banking users by impersonating an *mBank* “security” app; the dropper prompts installation of an additional “Play” component and then abuses **Android Accessibility Services** for persistence and control, enabling **keylogging**, **screen capture**, and hidden **VNC-style remote interaction** to facilitate fraudulent transactions. Separately, Cyderes described an ongoing, large-scale piracy-channel campaign where cracked game installers hide behind a legitimate-looking **Ren’Py** launcher tracked as **RenEngine**, which decrypts and launches subsequent stages and introduces **HijackLoader** via techniques including **DLL side-loading** and module stomping; observed final payloads include **ACR Stealer** (and in some cases **Vidar**) to exfiltrate browser credentials, cookies, and crypto wallet data. Cybereason detailed a different installer-themed operation in Chinese-speaking communities delivering **ValleyRat/Winos 4.0** attributed to **Silver Fox APT**, notable for using the rare **“PoolParty Variant 7”** process injection (abusing Windows I/O completion ports and `ZwSetIoCompletion()` after duplicating a handle from `Explorer.exe`) plus a strengthened watchdog mechanism via injection into `Explorer.exe` and `UserAccountBroker.exe` to maintain persistence.
Jun 29, 2026