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

• 5d4c903e2ba132fe886be296c10707e9
• 09f87e9acea317ca581d3d31655381b2
• 4ad9f0ba9446148bbfbe31b7e1861704
• 057df2411d38a779d6d97f2e769af90e
• 074bdd1e98be183d3501cde461be8136

SHA-256

• ce6f0090d1c38351a4a9dab52bf4ad817c3f2ea5a6e5cef4dd139311ea1e4c54
• 09aec8bcc0b5098a8dfa767242c2b272807d72cfd68d501ac38278212432fb05
• db879fb9c4dc5f17da2744c2106f60fd0b62c68a5ea8e3651df163f6a884b22a
• e049a669a569c924198e402401ec91a6e564fe6f6c82a124bfd5c72e28ade6ce
• 53e6b4fcb7d3717f52af9a0034df04ebb35d0173467ee7374e1b789594dbf081

SHA-1

• e313fc9e2f4ce3499ba5fe8de0ce3533ea5a55d3
• ea32a129164c514976df324a2959dca2a0fda744
• 0479cfe50e1d69c4e15e903fe33f311203e10afe
• 0bdd24dae49898910d086a5887676bb50f30d6ca
• 88e79b3d0e94bd213559b9ccd95e94b7923f8f17

Remediation

• Block all threat indicators at your respective controls.
• Search for Indicators of compromise (IOCs) in your environment utilizing your respective security controls
• Emails from unknown senders should always be treated with caution.
• Never trust or open links and attachments received from unknown sources/senders.
• Enable antivirus and anti-malware software and update signature definitions in a timely manner. Using multi-layered protection is necessary to secure vulnerable assets
• Patch and upgrade any platforms and software timely and make it into a standard security policy. Prioritize patching known exploited vulnerabilities and zero-days.