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Severity
High
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
- acf00d8c13f4e5176aa845fc9bb07df8
- 2fe130c90aa36bd0487a6dd6cf09af7a
- d9a3ccd2feddcd5ffa10dcfd62632ba5
- 07a7bbf7a7d6ad69a6d0a5b7fff8c628
- 12276fe6043cc60e905ebea962bda9cb
SHA-256
- 0589376ae4d26eaec94408164964872b2cfda145b9e987c52b228531daa92da3
- d63439a5b9d2e17a039312cad813f16b956d0ae81ad89772ab618dbee7f3c923
- 2df2ef6accd4e1ff9a0a443431853fc8f6453d7580ddb91fc6e6ed3990f8ae43
- f09169b81b9f1f9cd98d796cbbf89bb05415133f38d6f28d694b5e145e93c0be
- 8deb48a9d5d45d9f8cbf1708db73970f38b4c78e6a8501d1b351dd7a143cac06
SHA-1
- 48b5f8dbd1e9453c069b09cf6f7be3449bff8c54
- f70d634d1c0cf1f634914c5747d78f38f4140fd2
- eef50a29f4e32181e82ad3bd05613b4207a086e1
- 68c4802a682473b301fd9b1f1473eecfa3247a5c
- bbdfc5143d830b65b36e4a613f6eb96e639dc3c4
Remediation
- Block all threat indicators at your respective controls.
- Search for Indicators of compromise (IOCs) in your environment utilizing your respective security controls
- Passwords – Ensure that general security policies are employed including: implementing strong passwords, correct configurations, and proper administration security policies.
- Admin Access – limit access to administrative accounts and portals to only relevant personnel and make sure they are not publicly accessible.
- Patch and upgrade any platforms and software timely and make it into a standard security policy. Prioritize patching known exploited vulnerabilities and zero-days.
- Enable antivirus and anti-malware software and update signature definitions in a timely manner. Using multi-layered protection is necessary to secure vulnerable assets.