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 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.

Impact

• Credential Theft
• Unauthorized Access
• Theft of Sensitive Information

Indicators of Compromise

MD5

• 41f8d15a55a34ca15ca2f692ff310482
• e1bdba8cd7ae8d8f3fe039b5ee58b88d

SHA-256

• 47f4d62c59b9643f5dbb6d7447570ed98ccd77e0ef77e5ba870e3b978ae8fec5
• b7f93fdcba04537197b4d1a307bf54da300480074376b631c82c1a2c903a5db5

SHA-1

• 5cf73381576dbf94f84fd257dd8fb81a6a42d802
• b61a538cdbe88e5f9c769006147d64f93117f890

URL

• https[:]//urlhaus[.]abuse[.]ch/browse[.]php?search=exe

Remediation

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