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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
- 112ebeeaedd376d165db5150be6ab817
- 2552287b4733078f12b4a831c698cab6
- a703c90e7ed1b0eb8ab552ec112f46c1
SHA-256
- a5cd7f6bf2a036e52a9df856c16369f5adc8d4a4
- c615919f27daeeab06be9a669bebd547e557bf38
- b7e6a0a39e50383823f0d48db77347a3dc2fdbbc
SHA-1
- 2dd4b645155f01cf1f0a5b38addeceda5068bc58cdd2d8a6b0376aa7787d2122
- 7f0289f08df904da436b8e99605e74518c29f3321a10c7c0b37fced0f1e93202
- 5d910ee5697116faa3f4efe230a9d06f6e3f80a7ad2cf8e122546b10e34a0088
URL
- https://cdn.discordapp.com/attachments/1047544891632259145/1047586477921538178
- http://20.238.8.87/Online/Rump.xls
- http://4.204.233.44/Dll/Dll.ppam
Remediation
- Block all threat indicators at your respective controls.
- Search for IOCs in your environment.