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 Remote Access
• Data Exfiltration
• Credential Theft

Indicators of Compromise

MD5

• c0f47cefd86e4f7001fc2ddb8f3e0c5d
• 45beeab3735b33386dc605d813ab1712

SHA-256

• 30657f9922b3a20543bd4de8638cbdba793bcda6ad307e61f3227dce43b705d0
• 4df37056407ca0353e2357399ec8f2bd7583b6d10fc5d1d4f6744b9415a1ce2f

SHA-1

• 2b0fc1b8bad1b638a1798ada05e5c47c5c920cff
• 9570171eb0875939b3a9fd51710422036ca968a7

Remediation

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