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
- 2f380fb35a4e38df693dbe4250388050
- 1a6bcd2b23cae7575dd5f3831f4798fb
- f726e190380b36849199d948a0aa88b2
- 62d1e40d03fff66fb9f6037e2a72846
SHA-256
- 01c0c4f5a39a9ad6fb6e98d41bff8284fbd5fb8c57e3f7d0c061b99d9690c743
- 06957330a4493c4baf1772737955a6f7be05413490cacdda47e4bb7bb3e6113b
- 02b3e3e68be3910925e08db8b4f976e0c884be58fc7075c31d56706f1bac3d3f
- 0998d0b25a6e836a7fc4c37b0b58c50cf3d3b7512c1f053eba8a0be514eeaa81
SHA-1
- 3eef31f16de114ed279dfa0c5cf453b598bfe64a
- af444c09f566b0577fd450c195fc9e8c86312f45
- 5b2232a2f8429daf7f1363fad343276193990776
- de0571c954fba38c94c0f029e9bcba9f8e81bb25
Remediation
- Block all threat indicators at your respective controls.
- Search for IOCs in your environment.