Trojan.Win32.DIPLE.H

 Analysis by: Francesca Villasanta

 ALIASES:

Trojan.Win32.AutoIt.eww (KASPERSKY)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


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.

It executes then deletes itself afterward.

  TECHNICAL DETAILS

File Size:

699,803 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

23 Jan 2023

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:

  • %User Temp%\aut{Random}.tmp → Deleted afterwards
  • %User Temp%\hvavzgf → Deleted afterwards
  • %User Temp%\~zFavUrl.Ex_ → Deleted afterwards
  • %User Temp%\fbinst.dll → Deleted afterwards
  • %Favorites%\淘宝购物\icon.ico
  • %Favorites%\淘宝购物\Desktop.ini
  • %Favorites%\中国最大特产网-特产优联.url
  • %Favorites%\天地联盟-您身边的提款机.url
  • %Favorites%\淘宝购物\淘宝品质铺精选.URL
  • %Favorites%\淘宝购物\淘宝网 - 商城频道.URL
  • %Favorites%\淘宝购物\淘宝网 - 女人频道.URL
  • %Favorites%\淘宝购物\淘宝网 - 数码商城.URL
  • %Favorites%\淘宝购物\淘宝网 - 淘!.URL
  • %Favorites%\淘宝购物\淘宝网 - 电器城.URL
  • %Favorites%\淘宝购物\淘宝网 - 男人频道.URL
  • %Favorites%\电视网 最新最全直播节目.url

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Favorites% is the current user's Favorites folder, which is usually C:\Documents and Settings\{user name}\Favorites on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\Favorites on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It adds the following processes:

  • %User Temp%\~zFavUrl.Ex_ -y -o"%Favorites%"
  • %System%\cmd.exe /c %User Temp%\fbinst.dll "%Windows%\8f2cf0\SUPPORT.IM_" output IMG/* %~nx%User Temp%\fbinst.dll  "%Windows%\8f2cf0\SUPPORT.IM_" output IMG/* %~nx
  • %System%\cmd.exe /c ping 127.1 -n 50® add "HKCU\Software\Microsoft\Internet Explorer\Main" /v "Start Page" /d "www.{BLOCKED}.com.gr" /f® delete "HKCU\Software\Policies\Microsoft\Internet Explorer\Main" /v "Start Page" /f® delete "HKCU\Software\Policies\Microsoft\Internet Explorer\Control Panel" /v "HomePage" /f
  • %System%\cmd.exe /c ping 127.1 -n 3&del /q "{Malware Path}\{Malware Filename}.exe"

It creates the following folders:

  • %AppDataLocal%\8f2cf0
  • %Favorites%\淘宝购物

(Note: %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Favorites% is the current user's Favorites folder, which is usually C:\Documents and Settings\{user name}\Favorites on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\Favorites on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It executes then deletes itself afterward.

Other System Modifications

This Trojan adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Start Page = www.{BLOCKED}.com.gr

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

18.202.06

FIRST VSAPI PATTERN DATE:

18 Jan 2023

VSAPI OPR PATTERN File:

18.203.00

VSAPI OPR PATTERN Date:

19 Jan 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

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

Delete this registry value

[ 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.

  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
    • Start Page=www.{BLOCKED}.com.gr

Step 4

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.
  • %User Temp%\aut{Random}.tmp
  • %User Temp%\hvavzgf
  • %User Temp%\~zFavUrl.Ex_
  • %User Temp%\fbinst.dll
  • %Favorites%\淘宝购物\icon.ico
  • %Favorites%\淘宝购物\Desktop.ini
  • %Favorites%\中国最大特产网-特产优联.url
  • %Favorites%\天地联盟-您身边的提款机.url
  • %Favorites%\淘宝购物\淘宝品质铺精选.URL
  • %Favorites%\淘宝购物\淘宝网 - 商城频道.URL
  • %Favorites%\淘宝购物\淘宝网 - 女人频道.URL
  • %Favorites%\淘宝购物\淘宝网 - 数码商城.URL
  • %Favorites%\淘宝购物\淘宝网 - 淘!.URL
  • %Favorites%\淘宝购物\淘宝网 - 电器城.URL
  • %Favorites%\淘宝购物\淘宝网 - 男人频道.URL
  • %Favorites%\电视网 最新最全直播节目.url

Step 5

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %AppDataLocal%\8f2cf0
  • %Favorites%\淘宝购物

Step 6

Scan your computer with your Trend Micro product to delete files detected as Trojan.Win32.DIPLE.H. 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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