Analysis by: Joselyn Canuela
ALIASES:

UDS:DangerousObject.Multi.Generic (Kaspersky), BackDoor-FDOH!F4B1C2D17DF6 (McAfee)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel: 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: 6,781,440 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 23 Apr 2017
Payload: Drops files

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.

Installation

This Trojan drops the following files:

  • %System%\msdoc.exe - detected as TROJ_MEWSPY.D
  • %System%\winscp.dll - detected as BKDR_ZEGOST.AUSEI

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

It adds the following processes:

  • %System%\msdoc.exe fuckjapan
  • %System%\msdoc.exe japandog

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Other System Modifications

This Trojan adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Fusion\JPdog

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\winscp
Type = 288

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 13.418.03
FIRST VSAPI PATTERN DATE: 23 Apr 2017
VSAPI OPR PATTERN File: 13.419.00
VSAPI OPR PATTERN Date: 24 Apr 2017

Step 1

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

Step 2

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Search and delete this file

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.  
  • %System%\msdoc.exe
  • %System%\winscp.dll

Step 4

Delete this registry key

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Fusion\JPdog
  • HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\winscp

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_FAKENETROS.B. 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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