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

• 7de4382e6f4093373bf61e99e714c286
• 9058175e129983f1fa26192b92963427
• bed701af2601f7d0b9e02578f8a7d190

SHA-256

• cf98b99bfc23dd600c5a269257b96e19b8ef228631a8a1dd39bfe14ed89b11f1
• edcf9ff78c1052de65460ccb3122af13229421ba933548e5de24cebd684d1aa8
• 4d45b8210c1a3ee305e9adcf9f7e055b562c6c8977e1210782a9a57155123417

SHA-1

• 67cb43e25a76a7dbd05a195e3b070ae88b84ab6e
• 884f78eed7337ca3305f175e4cdf30093465abc9
• f4617afd24c07a057b91b1f52e66a4167580bdb1

Remediation

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