VBS_DLOADE.XXQD

April 26, 2017
 Analysis by: Cris Nowell Pantanilla
 PLATFORM:

Windows

 OVERALL RISK RATING:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • 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 the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

It connects to certain websites to send and receive information. It gathers information and reports it to its servers.

  TECHNICAL DETAILS

File Size:

75,269 bytes

File Type:

VBS

Memory Resident:

No

Initial Samples Received Date:

24 Apr 2017

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 Startup%\{random}.vbs ← executes component files
  • %User Profile%\chrome\{random}.vbs ← executes component files
  • %User Profile%\{random}.bat ← executes century.dll
  • %Application Data%\Roaming\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\google chrome.lnk
  • %Application Data%\Roaming\Microsoft\Internet Explorer\Quick Launch\google chrome.lnk
  • %User Profile%\Desktop\google chrome.lnk
  • %ProgramData%\Microsoft\Windows\Start Menu\Programs\google chrome.lnk
  • %ProgramData%\Microsoft\Windows\Start Menu\Programs\Google Chrome\google chrome.lnk

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Documents and Settings\{user}\Start Menu\Programs\Startup on Windows 2000 and XP, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows Vista, 7, and 8.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %ProgramData% is the Program Data folder, where it usually is C:\Program Files in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData in Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It creates the following folders:

  • %User Profile%\ext ← extracted from ugt.zip

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

Other System Modifications

This Trojan deletes the following files:

  • %User Profile%\*.dll
  • %User Profile%\ugt.zip
  • %Application Data%\Roaming\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\google chrome.lnk
  • %Application Data%\Roaming\Microsoft\Internet Explorer\Quick Launch\google chrome.lnk
  • %User Profile%\Desktop\google chrome.lnk
  • %User Profile%\Desktop\google chrome2.lnk
  • %ProgramData%\Microsoft\Windows\Start Menu\Programs\google chrome.lnk
  • %ProgramData%\Microsoft\Windows\Start Menu\Programs\Google Chrome\google chrome.lnk
  • %All User Profile%\Desktop\google chrome.lnk
  • %All User Profile%\Desktop\google chrome2.lnk

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %ProgramData% is the Program Data folder, where it usually is C:\Program Files in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData in Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It deletes the following folders:

  • %User Profile%\chrome

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\0
1407 = 0

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\1
1407 = 0

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\2
1407 = 0

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\3
1407 = 0

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\4
1407 = 0

Process Termination

This Trojan terminates the following processes if found running in the affected system's memory:

  • rundll32.exe

Download Routine

This Trojan connects to the following URL(s) to download its component file(s):

  • http://storage.{BLOCKEDgleapis.com/zeusthor/th010 ← ugt.zip
  • http://storage.{BLOCKED}gleapis.com/zeusthor/d6 ← century.dll

It saves the files it downloads using the following names:

  • %User Profile%\ugt.zip
  • %User Profile%\myinside.dll ← extracted from ugt.zip
  • %User Profile%\century.dll

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

Other Details

This Trojan connects to the following website to send and receive information:

  • http://{BLOCKED}devx.net/log3.php

It does the following:

  • It checks if the machines locale is set to Brazil.
  • It deletes Google Chrome shortcuts and replace them with a shortcut that points to a component file.
  • It drops the following files as markers:
    • %User Profile%\73x
    • %User Profile%\73bx
  • It checks for the presence of the following files:
    • %Program Files%\gbplugin\gbiehuni.dll
    • %User Profile%\appdata\local\aplicativo itau\itauaplicativo.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.)

It gathers the following information and reports it to its servers:

  • System Caption
  • OS Language
  • Computer System Name
  • Install Date
  • Registered User
  • Country Code
  • System Version
  • Architecture

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.360.07

FIRST VSAPI PATTERN DATE:

24 Apr 2017

VSAPI OPR PATTERN File:

13.361.00

VSAPI OPR PATTERN Date:

25 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

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\Windows\CurrentVersion\Internet Settings\Zones\0
    • 1407 = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\1
    • 1407 = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\2
    • 1407 = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3
    • 1407 = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\4
    • 1407 = "0"

Step 3

Search and delete this folder

[ 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. %User Profile%\ext

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 Profile%\73x
%User Profile%\73bx
%User Profile%\ugt.zip
%User Startup%\{random}.vbs
%User Profile%\{random}.bat
%User Profile%\chrome\{random}.vbs
%Application Data%\Roaming\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\google chrome.lnk
%Application Data%\Roaming\Microsoft\Internet Explorer\Quick Launch\google chrome.lnk
%User Profile%\Desktop\google chrome.lnk
%ProgramData%\Microsoft\Windows\Start Menu\Programs\google chrome.lnk
%ProgramData%\Microsoft\Windows\Start Menu\Programs\Google Chrome\google chrome.lnk

Step 5

Scan your computer with your Trend Micro product to delete files detected as VBS_DLOADE.XXQD. 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.

Step 6

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.


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