SynkLoader is a modular malware loader employing multiple programming languages (Python, C#, C++, PowerShell) to evade detection. Infection starts with Microsoft Teams phishing where attackers impersonate IT helpdesk personnel to convince targets to install a fake PowerShell cleaner via an MSI installer. The malware resides in memory, profiles the infected system, establishes persistence via scheduled tasks, and deploys a fake Windows lock screen to phish credentials. It includes modules for reverse proxy network tunneling, allowing threat actors to access internal corporate systems using stolen credentials, and provides remote shell and VNC capabilities for hands-on-keyboard operations. The multi-stage infection chain and capabilities indicate potential use in ransomware operations or as an initial access broker.

The malware enables attackers to gain persistent access to infected systems, steal user credentials via a fake lock screen, and tunnel into internal corporate networks using a reverse proxy. This facilitates lateral movement and hands-on-keyboard attacks through remote shell and VNC modules. The infection chain's sophistication and modular design increase the risk of subsequent ransomware deployment or selling access to other threat actors.

No official patch or vendor advisory is available for SynkLoader. Mitigation should focus on user awareness to prevent phishing via Microsoft Teams, blocking MSI installers from untrusted sources, and monitoring for suspicious scheduled tasks and memory-resident processes. Use endpoint detection tools capable of identifying multi-language modular loaders and fake lock screen behaviors. Network defenses should monitor for unusual reverse proxy and tunneling activity. Since no patch is available, these preventive and detective controls are critical.