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February 8, 2022Rewterz Threat Alert – GuLoader Malspam Campaign – Active IOCs
February 8, 2022Rewterz Threat Alert – Ukraine Under Attack – Active IOCs
February 8, 2022Rewterz Threat Alert – GuLoader Malspam Campaign – Active IOCs
February 8, 2022
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
- 7e96a3fcb236f473cf982b7f573dc2fc
- 32a274da8c5035892372196033baf4d9
- ae0c2623c680904b9af5a98d6217cc3b
- e477045803bdc6d70f1256b3120fec13
- 9a27d06ce8bc042ca50e72177113aa05
- 98f8d944fdbee879daf3afe431a5bbcb
- b52687cfa1cd78d0fbb93d39130f4d11
SHA-256
- 47c6a61606ec81f50a290815206413ebe02de42df2fd5d297a7f301262ce6a03
- eb92941109bd0597503b0df86d657ae90a1eae16095a9a9ef945fadbe6f1e89b
- fef984d0cfaacd9e1685f796788009e017649a9485e7927a61968007f6e05bcd
- e645304cf52ad9b963c87721d44da7a06404b9fa3abe2a9681c0ffd93ef52fc8
- 676dd0805916c70ceb66dbec5e03c4e859712954d0d3daa442c8d61a70a85be4
- cafc8ef6510e2000717028104baaae5a4999267311216127e25174ff7fcfcdb4
- 35125b1dd360a1a6c3644dee373860f7e3c26660cb7cd8de4718b4ac8e4b4353
SHA-1
- a6b64f4c513178dd7d9ae0f7da800dec79eb9216
- cb69e3df71a9526f4afd9a3e409a9b7a816c6465
- ec6fea140a61b235ffa0ffd1a1798bbd6a4587e8
- cb0911365e1a5d401c552559c01c7c7868e1d8d3
- 460321c5732a3412ab945e97b9d70a2f5a73811b
- 1b86fe6cbac94d5dc390f57d444589b15b3b906b
- 01b74ced167723d1dd222d6321e806a07f13d45a
Remediation
- Block all threat indicators at your respective controls.
- Search for IOCs in your environment.