Analysis by: Leidryn Saludez
ALIASES:

BV:Agent-AUM [Trj] (AVAST)

 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, Dropped by other malware

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: 212 bytes
File Type: INI
Memory Resident: No
Initial Samples Received Date: 06 May 2024

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.

Other Details

This Trojan does the following:

  • It is used to customize and adjust settings for the Windows folders that contain the file it points. In this case, it customizes a folder view by pointing to a specific folder template file to store the settings or customizations for the folder's view.
  • It contains a reference to a folder template file named "Temp.Htt" → Detected as JS_NYXEM.E
    that attempts to execute an executable file named "WinZip_Tmp.exe" → Detected as WORM_NYXEM.E
  • It sets "ConfirmFileOp" entry to 0 to avoid warning when deleting or moving the folder.

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 19.326.02
FIRST VSAPI PATTERN DATE: 07 May 2024
VSAPI OPR PATTERN File: 19.327.00
VSAPI OPR PATTERN Date: 08 May 2024

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.Win32.NYXEM.A. 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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