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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
Indicators of Compromise
MD5
- 6d0941f64b7968007db7eef0a06a0cca
- e755d66ec3fb3877c81b6c6818ef083e
SHA-256
- 2ebca90b91d537ccf128e52e55d48bd2ac2563319dc07f9435942c42df9a4d8d
- 56203d61bb74a63227367a5d68f3a4869c109be343fccd0bf992f30d0d3192ad
SHA-1
- 0a9fe217013e7a27134ee5633f1c5e750b0604a6
- e79fdfd8ac6794ebf4daeb044dc98ea47ddb3c4f
Remediation
- Block all threat indicators at your respective controls.
- Search for IOCs in your environment.