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

• 40f63615d0e35fd2cfe75af1b9c2980a

SHA-256

• 1ab34045d03ee98588e39a3d4f53a963de51ed8edc4169b458bf66f8bc5f114c

SHA-1

• 1a058a4f806ebce63356b2a793240a1c7ae2b55f

Remediation

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