Rewterz Threat Alert – GuLoader Malspam Campaign – Active IOCs
December 2, 2021Rewterz Threat Alert – DJVU Ransomware – Active IOCs
December 2, 2021Severity
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
- a31e6ca5620db4da55f0ad19e6ce16ef
- e3dffd69771b03d9b2b51567436be26c
- 5a3f8432068137c850d17874273fd427
- 18f1f44a28639057e66f8390d4faa3df
SHA-256
- 5c4644f3f478085f4731a7cb10da859599837a8f5315be6d9e549029bc5c5892
- 54622fa73246157a2e25e418d554d5ccafc663151ac067819d18f48caad9a32c
- 13958533a121d7d40e9b6c795e04f28a9bc66c29b713d0af780b66ecda3222b0
- a70002c527a508f14051e606115ad0a04c045d7ffdb6a70ed01361b3ce7b3de2
SHA-1
- 76977e85c771c15beb0e68054d372528013544fd
- 30d685427e8d7524565a8bf3773bfb271b9a0030
- 61c91d3c1a8f2af743431c593594e168e21e03c6
- ee8cf7689899772f5e59e66bc66b89fd19269ea0
Remediation
- Block all threat indicators at your respective controls.
- Search for IOCs in your environment.