Rewterz Threat Alert – SmokeLoader Malware – Active IOCs
December 17, 2021Rewterz Threat Advisory – CVE-2021-45105 – Apache Log4j Vulnerability
December 18, 2021Rewterz Threat Alert – SmokeLoader Malware – Active IOCs
December 17, 2021Rewterz Threat Advisory – CVE-2021-45105 – Apache Log4j Vulnerability
December 18, 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
- ac93dc198c284dff22cee5391f6fa6dd
- ad24b1319a3a895d8b83a0deae7eac57
- 19402d6c5cd427fbfc867279bd40667a
- 6d9a47c5bae0ee452b2076ed8b98dab4
SHA-256
- 21c6e2e0b14129c7016b431c0d9966bad6a0e35740414d314654df695fb15a68
- 63d4943fbc9e572db52df96729327f29c0342f7b7f192d823dc7a322116f033d
- ad363e875ebeaee352f9ce9a53f70fa1b8887ae3b42a9f1a817d3402db05b994
- 32ff5787da7645739eb059af2c09432f0b25401acfbc58a0f576ca6123bbee44
SHA-1
- 8c2e2f2b493abd6ca90ff0436457d52ea928dd43
- 81f2908cbb43a41fac8208a9805c06521331f512
- 72a3aaf031894dc1736bdfaa25bac181019a9398
- e65b81b050d75b8dcb5374e0b39601abf55d631e
Remediation
- Block all threat indicators at your respective controls.
- Search for IOCs in your environment.