Summary:
The report provides an analysis of a njRAT (Remote Access Trojan) sample discovered in October 2023. The malware, written in .NET, allows attackers to remotely control infected machines. Basic static analysis reveals key file information and suspicious strings indicating registry manipulation, network communication, and process control. Advanced analysis explores functions related to mutex, persistence mechanisms through registry and startup folder manipulation, as well as evasion tactics such as self-deletion and protection against task manager processes. The dynamic analysis uncovers hidden processes and registry keys associated with mutex. Indicators of compromise (IOCs) including URLs, IP addresses, and file names are also provided.

Analyst Comments:
The detailed analysis sheds light on the sophisticated techniques employed by the njRAT malware to establish persistence, evade detection, and maintain control over compromised systems. The use of mutex, registry manipulation, and startup folder hijacking demonstrates a strategic approach to ensure the malware's longevity within the victim's environment. Additionally, the malware's capability to protect itself by terminating processes associated with task manager tools indicates a proactive defense mechanism against detection and analysis attempts.

Suggested Corrections:
To mitigate the risks associated with njRAT and similar malware threats, organizations should implement a multi-layered approach to security. This includes deploying robust antivirus and anti-malware solutions capable of detecting and blocking RATs. Regularly updating security software ensures protection against evolving threats.

Link(s):
https://medium.com/@zyadlzyatsoc/njrat-malware-analysis-report-e9fc235fa563