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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
- 07142e58dfaa9d60a67ae5bc484d4bf8
- c8afd21797766c02a772861ab90e896c
- 4d1788630f479dd0ce9bc0bdab04454c
- ecac86fb1a0c652381f335604e53e4c9
SHA-256
- 019c1278cec3e4985815aa5ef8d6900e72a4b06eda9be5c767c060e0496f90e7
- f1b5d822b7e9f4fca84708801db15cbeac28150e7eaaa8bacdb8a8fa3594cd35
- 4a9bda85ad3a12d36304752bf78595f549cbae42cb697f154dd029902d2c6a1f
- 01f4e13ab71a4d8128afb110914e9ef1fc606dfd4e2242f75ed5dbd76dc59484
SHA-1
- 1d0c4dae9714ef3d6f3ddbcebd8bbcdf4809882a
- 06a72547fdc9fdd6a48d5c1f687ae36cb160b136
- 4379fc3d05244905f3a1a0788804b57690d85ace
- 8a2005a58270a42f8e3731a9aef7ce89c65fa372
Remediation
- Block all threat indicators at your respective controls.
- Search for IOCs in your environment.