Analysis by: Francesca Villasanta
ALIASES:

Trojan.Win32.Korplug (IKARUS); Win32:APTX-gen [Trj] (AVAST)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • 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: 90,512 bytes
File Type: DLL
Memory Resident: Yes
Initial Samples Received Date: 24 Aug 2023
Payload: Decrypts file

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 searches for any of the following files and terminates if not found:
    • {Malware Path}\NoteLogger.dat
    • {Parent of malware path}\.vscodes\NoteLogger.dat
  • It decrypts the contents of this file:
    • NoteLogger.dat ← detected as Backdoor.Win32.DOPLUGS.ZTKI.enc
  • The decrypted content is injected and executed from the memory of the parent process.

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 18.722.03
FIRST VSAPI PATTERN DATE: 27 Sep 2023
VSAPI OPR PATTERN File: 18.723.00
VSAPI OPR PATTERN Date: 27 Sep 2023

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

Restart in normal mode and scan your computer with your Trend Micro product for files detected as Trojan.Win32.DOPLUGS.ZTKI. 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 this Knowledge Base page for more information.


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