Rewterz Threat Alert – Nanocore Rat – Active IOCs

Severity

Medium

Analysis Summary

The NanoCore remote access Trojan (RAT) was first discovered in 2013 when it was being sold in underground forums. The malware has a variety of functions such as a keylogger, a password stealer which can remotely pass along data to the malware operator. It also has the ability to tamper and view footage from webcams, screen locking, downloading and theft of files, and more. The current NanoCore RAT is now being spread through the malspam campaign which utilizes social engineering in which the email contains a fake bank payment receipt and request for quotation. The emails also contain malicious attachments with .img or .iso extension. The .img and .iso files are used by disk image files to store raw dumps of either magnetic disk or optical disc. Another version of NanoCore is also distributed in phishing campaigns leveraging specially-crafted ZIP files which is designed to bypass secure email gateways. The malicious ZIP file can be extracted by certain versions of PowerArchiver, WinRar, and older 7-Zip. The stolen information is sent to the command and control (C&C) servers of the malware attacker.

This RAT gathers the following data and sends it to its servers:

• Browser’s user names and passwords
• File Transfer Protocol (FTP) clients or file manager software stored account information
• Email credentials of popular mail clients

Impact

• Credential Theft
• Unauthorized Access
• Theft of Sensitive Information

Indicators of Compromise

MD5

• 2aaf8f8966376cddfab41c51ff9cfc1b
• b5b3839bfaaace243a1fae8381cb76d2
• b229a36fe4c6961995d60d7eb0cd0ede

SHA-256

• 73e73341805c1e6d337567c0c6388efb665f759b879e15737794006af1e6f258
• 173234405514839511bcb11f596004238bbbea024912bf6678395110d3646dda
• f1e9fd8dc15cf4c038828e3e9e39c7b70c79c676ca8ca025fc93fca7da1602a2

SHA1

• 76e2ddcb3bdf098ed63ac4a8d624721604482a32
• 238e539b247b3557221000616b36cfaeaf49c086
• 8613cca2bd693cd028581c6c12ce8209179c69e2

Remediation

• Block all threat indicators at your respective controls.
• Search for IOCs in your environment