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Kaspersky researchers reported that the NullMixer malware dropper is being used to deliver a broad bundle of malicious payloads in a single infection chain, including RedLine Stealer, SmokeLoader, and other trojans. The campaign was tied to lure content that promised cracked software, activators, and other illicit downloads, with victims exposed after running files that silently unpacked and launched multiple malware families at once.
The operation stood out for combining credential theft, downloader activity, and broader system compromise in one package, giving attackers several ways to monetize infected hosts. By stacking information stealers and loaders in the same dropper, the campaign increased the likelihood of successful theft of browser data, credentials, cryptocurrency wallets, and follow-on malware deployment, while also complicating detection and incident response for defenders.
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Securelist published research on the NullMixer dropper, describing it as delivering numerous malware payloads including RedLine Stealer and SmokeLoader in a single infection chain. The report indicates the campaign was active by the time of publication and documents its technical behavior and payload mix.
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Threat researchers documented multiple malware delivery chains using PowerShell-based loaders to fetch and execute credential theft and remote access payloads. In one campaign tied to **NullMixer**, a 32-bit loader masquerading as `sqlcmd.exe` pulled a script from a compromised WordPress site, decrypted an embedded .NET assembly, and launched the **Koi** stealer. Koi targeted credentials and data from browsers, **FileZilla**, **Discord**, **Telegram**, VPN clients, cryptocurrency wallets, and **Twilio Authy**, while also checking for **Trezor** hardware wallets; it used anti-analysis, anti-reinfection, and geofencing logic to avoid systems configured for several CIS countries. A separate PowerShell dropper hosted on `fancysunshine[.]top` was used to deploy **SectopRAT** and **HiJack Loader** while attempting to weaken defenses and erase evidence. The script added Windows Defender exclusions for the `C:` drive and selected processes, downloaded `NC.zip` and `RD.zip`, unpacked them into fake Chrome cache directories under `%TEMP%`, and executed `S-D.exe` from both locations. It also gathered the victim's external IP address and username, checked for a scheduled task named `MSSecurity`, exfiltrated results to `upload.php` over HTTP POST, and then deleted the archives, extracted files, output data, and the dropper itself to reduce forensic visibility.
Jun 29, 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
Researchers linked **PrivateLoader** to a long-running pay-per-install malware ecosystem that used SEO-poisoned sites and cracked-software lures to infect Windows users with password-protected ZIP archives and NSIS installers. The loader was repeatedly observed delivering a wide range of payloads, including **RedLine**, **Vidar**, **SmokeLoader**, **RisePro**, **Qbot**, **Dridex**, **DanaBot**, **TrickBot**, **Kronos**, **LockBit**, **STOP Djvu**, and **Conti**, while related tooling such as **Discoloader** and the Go-based **Anubis Loader** expanded the same distribution chain. Investigations described administration panels used to manage payload links, browser extensions, bot installs, and operator activity, with one panel reportedly overseeing about **20,000 bots** and collecting more than **11 GB** of stealer logs in less than two weeks. Separate reporting showed PrivateLoader also acting as an access broker for other criminal and state-linked operations. Analysts observed it distributing **ColibriLoader** in a campaign tied to **UAC-0113**, a group CERT-UA has associated with **Sandworm**, and later delivering **Socks5Systemz**, a proxy botnet that converted infected Windows hosts into rentable proxies. Bitsight estimated Socks5Systemz had about **10,000 infected systems** and at least **53 servers** supporting command-and-control, telemetry, DNS, and backconnect functions, with customers buying proxy access through a Telegram-linked service for cryptocurrency. Across the reporting, PrivateLoader emerged as a versatile initial-access platform connecting commodity stealers, banking trojans, ransomware, proxy monetization, and higher-end intrusion activity.
Aug 15, 2026