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

• 7ff6fd21d9248ee8ee8dcb79f71526d7
• 3b952923014bf441e94139ebaaf41fb2
• 7b95eafabe994a0b6070d1d7431df9ab
• 47334b00feed3458e76eb523598c183e

SHA-256

• c4332e25e503e91d459409da0adc1fb90a9917704616ccefc10fd55eeb29a294
• d24dff2eedb8d13abb9c2544a37b5ac1bda43aebaa196d345278ab4bafce616a
• 19f5c35b09c901c7d474df969073e3edbdfc637352679caf655d0108f0ec9b67
• ab84feaa3cf19828c314e4dcfe839aa3ffbbcc949d9e4fa291274104e12f41a5

SHA-1

• 9964d987769ed3cacee29f573fc08a27cabca824
• 56fcc12f9d1f4aab0ee71c12231a0fd7a4f7dcbe
• cadad4c8198daf42a7acc142493c353da3ab64bc
• 6551a1e5487b540142ae12ad038eb366b7101c99

Remediation

• Block all threat indicators at your respective controls.
• Search for IOCs in your environment.