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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
- df214550980373dee4a7df3529fc1a0d
- f10f0d9e0190a3a025b16daee7b0222d
- 518fce6038c59e523eeae4d957adc4dd
- ebd362cead250d37b6fccd2569ab7864
- 844a7e296413f75b3d271a4acf29c228
- d6fad446bac8435f66bc72692d8c689d
SHA-256
- d9bf2be7b30ce4bb2e50824cb3e8f9c39de3491bc31faf603a2cc05ab7916848
- 4dd54e45d55a8b49a5582027a812f2d2f055fb55c8f292d62c89236583822e9e
- 61d5c13bd51a445f0e604af9bbfec3a791f700d33d7c3134ebda21fe774142c2
- a198dcecc84ef9343f7ea290508cead1ddd9b113f01da7a99429b970ce887540
- 39c169c40b4fe73e963ea41d7498aaaa75691b2b01c8c175578b966cc97a57d5
- a238d778941efac06a2d92ea8c1faa42a5259d8ae7cdf2c8956d7edf6e64d303
SHA-1
- 006e60c67aba56c85f5670edc08113d495abf276
- 3bc1499e5617a9777252e376ce4b5cb9cce03760
- ce22dfb5a58f136872739f6a27e564fe3f4ae672
- 20969fa8c59e9bd35fbfe50c470b441a3cc608e3
- 674fbf0daa154587196da0ed8b22de95b2b9fca3
- a1f345f6fb7634c1f87a2dfda85f6fede9d7a970
Remediation
- Block all threat indicators at your respective controls.
- Search for IOCs in your environment.