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January 3, 2023Severity
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
- bcb9b9a0acd5779ef90b538c726b4a31
- b8b832b0947eb51b4d96c1a86b73a21b
SHA-256
- 01eaa6e40b788e86fcdf386e4a3d5ceb09d0562287078ee082c6f7106875a045
- de075698d273458c9243ce7e97c0d2f95739cdd0fb8ea659ca7417ada4b37be9
SHA-1
- b255b52d0650d6e4ca2d22659f0b2baf5ffb706d
- 98b3c77ce7c9813302b24622a7f9044b87c7daf3
Remediation
- Block all threat indicators at your respective controls.
- Search for IOCs in your environment.