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

Domain Name

refuds.selfip.info

MD5

• ef2a8d73d894b40c1b6937f96cbb547e

SHA-256

• 0dc349c507d7109d7d74f5bb9fe004f967c188cfd8b9c57febd098191c1b58b7

SHA-1

• 8bc61846b447ab0b23667507f1ee34327eb2309e

url

https[:]//pasteio.com/raw/xFzZ891lGiiE

Remediation

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