We're gradually updating threat actor names in our reports to align with the new weather-themed taxonomy. Learn about Microsoft threat actor names
Trojan:Win32/Znyonm!rfn
Aliases: No associated aliases
Summary
Trojan: Win32/Znyonm encompasses a persistent and adaptable trojan malware family targeting Windows devices. Security softwares use this designation to flag a cluster of malicious behaviors centered on unauthorized access, data harvesting, and serving as a gateway for more severe payloads. It underscores its role as a foundational loader within complex attack chains, often linked to activities ranging from financial theft to espionage. Emerging prominently in late 2023, this threat demonstrates a high degree of operational sophistication. It infiltrates networks by exploiting critical software vulnerabilities or through deceptive software bundles. Once established, its modular framework supports extensive device reconnaissance, stealthy persistence, and secure command-and-control communications, posing a significant challenge to conventional detection methods.
- Immediately isolate the device by activating Airplane Mode and disabling Wi-Fi and Bluetooth to sever the command-and-control connection.
- Manually inspect and remove malicious persistence artifacts:
- In Task Scheduler, delete suspicious tasks like \Microsoft\Windows\DefenderUPDService.
- In the Registry Editor, scrutinize and remove anomalous entries under Run keys in both HKCU and HKLM hives.
- Delete known malicious files referenced in alerts, such as those in the C:\Windows\Temp\ path.
- Validate cleanup using a secondary scanning tool from a different vendor to catch any remnants.
- From a confirmed clean device, reset all passwords that were stored on or accessed from the infected device and activate multi-factor authentication on every applicable account.
Microsoft Defender Antivirus automatically removes threats as they are detected. However, many infections can leave remnant files and system changes. Updating your antimalware definitions and running a full scan might help address these remnant artifacts.
You can also visit our advanced troubleshooting page or search the Microsoft virus and malware community for more help.
