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

• 5f44b1e987ccc5d1c6c84e47ae32e61a
• 13701abb8b47b2e6ea2d9675c627342d
• 6e09d0b1cab55f424bfe35bc8506b731

SHA-256

• e0e3769f0b0197e919380533bd7d12e70b45eb0d2a906d21337c367dc3e2016e
• 44ffe36dad598708138873097f1da36e949a8ef60f1f6402c494bb6391424c10
• 3099206cb7db28552e5614d387e390516eb193259b400c2f6c9197e3d509b592

SHA-1

• 142081d06f1fbb3ec8c1267124b2e7eba0b2882f
• 21b3a3da6eed8de76a7b04e3117060b0fe87637c
• 96686edf4bcc7b9d6a4f2fc4d4090f636291b13a

Remediation

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