Rewterz Threat Alert – NJRAT – Active IOCs

Severity

Medium

Analysis Summary

NjRat is a Remote Access Trojan, which is found leveraging Pastebin to deliver second-stage payload after initial infection. There are multiple versions of the secondary payload used, ranging from base64 encoded version, hexadecimals, 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 amount of data via proxies.

Impact

• Unauthorized Remote Access
• Data Exfiltration
• Credential Theft

Indicators of Compromise

IP

• 199[.]59[.]242[.]153

MD5

• 7f1ca96d5c7c9cc6246fb37d4efb6bd4

SHA-256

• c88356af063fd3ee288050827af8269721404796b0124b939bb9c5464aacb1cc

SHA1

• 44540a32d0dc743c5d14a827ef658fe495606d92

Remediation

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