Analysis by: Paul Steven Nadera
 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size: 12,004 bytes
File Type: PDF
Memory Resident: No
Initial Samples Received Date: 11 Jun 2020
Payload: Displays message/message boxes, Connects to URLs/IPs

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Download Routine

This Trojan accesses the following websites to download files:

  • https://{BLOCKED}v.ms/u/s!ApCTWUgLiW1ibM22VVHKIkuAQRg?e=ytFEJx

Other Details

This Trojan does the following:

  • The document contains the following message details luring users to execute the downloaded malicious file:
  • The file downloaded is detected as Backdoor.Win32.NANOCORE.TIAOODHN

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 15.924.04
FIRST VSAPI PATTERN DATE: 11 Jun 2020
VSAPI OPR PATTERN File: 15.925.00
VSAPI OPR PATTERN Date: 12 Jun 2020

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 2

Scan your computer with your Trend Micro product to delete files detected as Trojan.PDF.NANOCORE.AJ. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check the following Trend Micro Support pages for more information:


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