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
- ff7a6dbd746f225c68ace5dac49f0ac0
SHA-256
- 411242a9aad24a80752cd8a115f428b33b474d1d835ee82652f4d4ea785d5750
SHA-1
- fb8fd8cc91076c0d261c1a7ca5c1cd4b41cd2ab8
Remediation
- Block all threat indicators at your respective controls.
- Search for IOCs in your environment.