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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
- db884b2c600a8a5ed0828507af0d5309
- 7fe6c8e06683b27692abc5afb1a76198
- 2899aa0c7794357d224a5dcb5e186d9a
- 8cbaeed69eb6dc76b58cffd92e4ea38b
- 859ea25e783ae20474cadb616cac2b17
- 340393a079a8ee9c6136a0ed629aaac3
SHA-256
- 16967aa6cf35b6821ac9d5ab794d8207654e394f786c456d89012b2103fa4d43
- 647e820900272cc662ccf0ae12baaf80f387b1c4f50c70ab8af390ddd88f235c
- 884639b2dc1f06412d6a7ce5e3aaefdfe3bdb3e346ac7a04bca596e07754ff78
- 08a745ee00309558803ed6def0af357ac0f0088a9aaf427ead21d8edbf3214dd
- cc7a868b4f6b71a4dd7d677712f8a8f05dc185923ec5d9fef942ac56fe02bf24
- 1c7c9750125cfe57ac189c2a0305affa8e7974d979a862fd0600d9347ee4c65e
SHA1
- 1c3b449760cb6c903a9eb28ee445551023a03c27
- b354221b16a379bdf713744ea378fd10d9b7c5fb
- 56fa2cd54d95eede2e33f5ea21ac73f56f2ad98c
- 2d39d954502022c0b2d48618ec017784909c39d1
- 32d6d6a1ea0361194704c65b13e5b1e8b8e72f6b
- 811c76e24f469c431cbdc73cd5ddca3cf4faca05
Remediation
- Block all threat indicators at your respective controls.
- Search for IOCs in your environment.