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
Indicators of Compromise
MD5
- bb91082749bddfbde4ecfe8de936cdfe
- 31f7fcf6606bea508260479008f9edd1
- 6cff1bd19c5df5da153936328a210769
- 7809d89aebc16107af640aecfda94430
- 41d608740bb964b50c7b79d28838a1c1
SHA-256
- 62338fe09d0cdc6d12ec53602ad6de0b72de0dd4d84a270e603d52d519aa0daf
- 359a90433cb910b2cf2a52db2ec47e29de27530be48bca465da6bc7237685856
- a5d0881d225db9a7fd126ef81701dd79e48d7424f72b0c8b5bc42d2ca688904f
- dd29ac9bdbf4cc14ac684211f09c767c32a9ec2227a3be67b989757912dce611
- 826a457a8a39e24ac925b31bcdb24fdb97bd468ff913a30ea2ce66d7bb52181d
SHA-1
- faa8f4f6437b45b3d15d44a3e32084137ceea866
- 8ff7d6b2d02bd01965a4c09f885b573d4982ecc2
- 3c8f2ff0515c9c5577244a60a55d851b16f8e037
- c00d9323e6c029998f9efdb3d51c1038ea138b42
- b604f184bcfb2fb1c533d02e43e572a90c2df080
Remediation
- Block all threat indicators at your respective controls.
- Search for IOCs in your environment.