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

• db404d344d12678f7213b44048818c17
• a09c751d80cd0b4ed6d0b25330e86ded

SHA-256

• 8c4909cf7dc12e6724f7cbb4f095d366237a93ce25c6eedde1ff435aba588c68
• 50f551c42e486b7373af0849ad98d55e2fd33fba29242b0f7146063827c8cb2d

SHA-1

• 7772297858581e8baa9b1546e8dd06fd255f0219
• 6f792fbb9caac24eb4eb7afb94699c856225fb3f

Remediation

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