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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
- ab8405c2bec574901f93a2f0bd062a7b
- 1d875dd3381d27c6717aafee2e757735
- 32b3d96a80b68fd5162fd4ef5bdd4fab
- 0db6e638be1d61929ed4c5981caf320b
- 23750df4eaa28261ec32fa7b05d43d12
- b5e157061078581c295bd4832ee3199f
- bf6ab4566503f8e29257f843114ac479
SHA-256
- cf2dad577ca320380e2c4cd1cd93f318e7720fd1f090d97dff5aa416bda55912
- 5d0affe2015998999db57d102b3add00f5bc9660c9b956173b840312fd0ebfee
- 98866ab8f86171f241ddc77e880188e06102d349cbe6c029e1bb86a1c24b216f
- 53446fe57f6c5a19150e5cfa43c2e48fe5ec92bfc8da1006269dd008e00d07b5
- 5197774889d7540ec8a8aac9dfef9f6367f6977de9314ab6ceca488f9145e417
- 17ce77ba51558d7591c2563cc6a528e03b2a5aa17f9383d4ff8859541b2a5ee9
- 6f0daa56b7cb46e562234df38a3e1d3ca5760372b9dc1e9e5ae36196a1d59c16
SHA-1
- fe69f5e501231c99d2b705da9d958c2ba1deab16
- cc84baa06da52fbb000209bf5bd005851f43135e
- fdfce3166c8347795a4f177766c74f2e409b06aa
- ba083538dfb59985d139fb9cec9446d5a6b30a83
- a5be07c0fb6376648048616613a7412116c8a692
- bb8b4b0159d62909edc2872d1ef36bceded42c47
- 9c01433ebd5722d333c306770d2caaa5f7ccd214
Remediation
- Exercise caution when receiving messages from unknown senders.
- Block all threat indicators at your respective controls.
- Keep your software updated to the latest patches.
- Search for IOCs in your environment.