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
- Data Exfiltration
- Credential Theft
Indicators of Compromise
MD5
- 8bc922ee19c73cc43d824fd460ce8792
- 2dac37b170e5f7e44a6bec724ea9c5e5
- eef7121815036412fa200505034cf402
- 285a81c1f13aafa77166da5ce8c2968d
- 8bc922ee19c73cc43d824fd460ce8792
SHA-256
- 81162ee7db0b9ac2574cc9d9e1b8ad60602a8038c06eb7eb1ec02ea760d75c78
- 3ea3f4ee45ba511246c87a375e7a07be7e594c9275daad936f3d6031b60b8fce
- 331ff8064460a968f6fb4320d61aee073a7c67f230d2844088670f6f4f3ff1d5
- c5b7facb1053e87d655699925bdd6391b047aea6740e26be0806240212419a5f
- 81162ee7db0b9ac2574cc9d9e1b8ad60602a8038c06eb7eb1ec02ea760d75c78
SHA-1
- beec1d64b2f6d66585b9cea5f9f70535712470f9
- 8b5ba553cbb79e321fdf9878aa0e7dc9430fc5df
- 3b48b09a0e8f99467526e511de0118891bf091da
- 4df9d8b6c8d96cb023f45e455c815a1362d64d8c
- beec1d64b2f6d66585b9cea5f9f70535712470f9
Remediation
- Block all threat indicators at your respective controls.
- Search for IOCs in your environment.