Rewterz Threat Alert – NJRAT – Active IOCs

Severity

Medium

Analysis Summary

NjRat is a Remote Access Trojan, which is found leveraging Pastebin to deliver a second-stage payload after initial infection. There are multiple versions of the secondary payload used, ranging from base64 encoded version, hexadecimal, JSON data format, compressed blobs, and also plain text data with malicious URLs embedded within. This is done in order to evade detection by security products and increase the possibility of operating unnoticed. njRat is developed in .NET framework and is able to hijack the functions of a compromised machine remotely, including taking screenshots, exfiltrating data, keylogging, and killing processes such as antivirus programs, while also connecting the machine to a botnet. RAT was also found abusing Windows API functions such as Windows API calls such as GetKeyboardState(), GetAsynckeyState(), MapVirtualKey() for keylogging, and data theft. It was also discovered downloading web scraping tools such as “proxy scrapper” in order to extract large amounts of data via proxies

Impact

• Unauthorized Access

Indicators of Compromise

MD5

• 7696f17a6cc147123d5bbd7f35df91ee

SHA-256

• b59f2f4d828ba89fdea8c6b3691b2f54bfe76aeb3d439acceb2035a543eb24b8

SHA-1

• 2e091a1e11038b75ffb48d56229f46f1f218d347

Remediation

• Block all threat indicators at your respective controls.
• Search for IOCs in your environment.