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June 10, 2022Severity
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
- 92c80777998fb2d7cf4a89e3c0485c32
- 1d97942727236d2e88c8b6f5356f3d2b
- 0478eb62f131c3955831d10a800b2214
- 79d1bb62e2f38f11004283173bc3e386
SHA-256
- 3b6074646068cfd2536df69f95c2b7d45ea1ca196098bede73a9dbdcba8e96e5
- c7ccd6379627a10943964b592a5f38764ae1d0d0d39d17760940871fb3cd2958
- cd530089d9213bf1f671ce688ee3852587fe4b85c29c957b5c534834cad2f9af
- 4618b753b110e60773272ab36a283e1b46513fc4aca209c9d3dedc879d0027b7
SHA-1
- 1af70450af73c0a589ed7c0eb07e6c5cf800f319
- 33e4ceb88f1da0ee6aed8388a1384827f0e2de95
- fe88a777e353906fac1de6c5c277e6088b904264
- 4e998dce305fcaccc1d4c3a6da6f986bfa4f762b
Remediation
- Block all threat indicators at your respective controls.
- Search for IOCs in your environment.