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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 Access
Indicators of Compromise
MD5
- 95605c11d4b59cb6b8a4661d91dd19de
- 7059d3f5185128394432baaaa44ee4ea
SHA-256
- d55978d37f1031b8b0e9811b9375b423d1cda7edfdef2e325f2861e829e5c8cc
- cb12e8f994044454d20ef2effd5d91d9573f1c5b6230b87df75f51bd4921878a
SHA-1
- 238ed88b706987043038b7c965395b69bc290219
- 462dbc0838cb721cfb99ce505a30b0c32237e5ba
Remediation
- Block all threat indicators at your respective controls.
- Search for IOCs in your environment.