PUA_BILDDOWNLOADER

August 13, 2018
 Analysis by: Michael Jhon Ofiaza
 ALIASES:

Downloader.Win32.DownloaderGuide.ccd (Kaspersky) ; SMG.Heur!gen (Norton)

 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.

  TECHNICAL DETAILS

File Size:

530,064 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

05 Aug 2016

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 creates the following folders:

  • %User Temp%\DLG
  • %User Temp%\DLG\requirements
  • %User Temp%\DLG\dlgres
  • %System Root%\DOCUME~1
  • %System Root%\DOCUME~1\Wilbert
  • %User Profile%\LOCALS~1
  • %User Temp%\DLG\initWindow
  • %User Temp%\DLG\initWindow\css
  • %User Temp%\DLG\loadingImage
  • %User Temp%\DLG\ui
  • %User Temp%\DLG\ui\common
  • %User Temp%\DLG\ui\common\base
  • %User Temp%\DLG\ui\common\progress
  • %User Temp%\DLG\ui\common\last
  • %User Temp%\DLG\ui\offers
  • %User Temp%\DLG\ui\offers\1522ef138ba104249c3934a80811f825
  • %User Temp%\DLG\ui\offers\d1218f43853f973f710cba676ef66845
  • %User Temp%\DLG\ui\offers\d033278d2583e0fe2b7585ceb4483ad9
  • %User Temp%\DLG\ui\offers\d033278d2583e0fe2b7585ceb4483ad9\css
  • %User Temp%\DLG\ui\offers\d033278d2583e0fe2b7585ceb4483ad9\img
  • %User Temp%\DLG\ui\common\base\css
  • %User Temp%\DLG\ui\offers\d033278d2583e0fe2b7585ceb4483ad9\js
  • %User Temp%\DLG\ui\common\base\js
  • %User Temp%\DLG\ui\offers\d1218f43853f973f710cba676ef66845\css
  • %User Temp%\DLG\ui\offers\d1218f43853f973f710cba676ef66845\img
  • %User Temp%\DLG\ui\offers\d1218f43853f973f710cba676ef66845\js
  • %User Temp%\DLG\ui\common\progress\css
  • %User Temp%\DLG\ui\common\progress\img
  • %User Temp%\DLG\ui\offers\1522ef138ba104249c3934a80811f825\css
  • %User Temp%\DLG\ui\offers\1522ef138ba104249c3934a80811f825\img
  • %User Temp%\DLG\ui\offers\1522ef138ba104249c3934a80811f825\js
  • %User Temp%\DLG\ui\common\last\css
  • %User Temp%\DLG\ui\common\last\img
  • %User Temp%\DLG\ui\common\last\js
  • %User Temp%\DLG\ui\common\progress\js

(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, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, and 8.. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %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, 7, and 8.)

Other System Modifications

This Trojan deletes the following files:

  • %User Temp%\DLG\test.part
  • %User Temp%\DLG\ui\offers\d033278d2583e0fe2b7585ceb4483ad9\uifile.zip.part
  • %User Temp%\DLG\ui\common\base\base.zip.part
  • %User Temp%\DLG\ui\offers\d1218f43853f973f710cba676ef66845\uifile.zip.part
  • %User Temp%\DLG\ui\common\progress\progress.zip.part
  • %User Temp%\DLG\ui\offers\1522ef138ba104249c3934a80811f825\uifile.zip.part
  • %User Temp%\DLG\ui\common\last\last.zip.part

(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, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, and 8.)

It adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Windows Script\Settings

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows Script\Settings
JITDebug = "0"

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\DLG1.tmp
  • %User Temp%\DLG\dlgres\DLG-Product-Logo.png
  • %User Temp%\DLG\initWindow\css\style.css
  • %User Temp%\DLG\initWindow\noconnection.html
  • %User Temp%\DLG\initWindow\progress.html
  • %User Temp%\DLG\loadingImage\loadingImage.bmp
  • %User Temp%\DLG\ui\offers\d033278d2583e0fe2b7585ceb4483ad9\index.html
  • %User Temp%\DLG\ui\offers\d033278d2583e0fe2b7585ceb4483ad9\css\style.css
  • %User Temp%\DLG\ui\common\base\index.html
  • %User Temp%\DLG\ui\offers\d033278d2583e0fe2b7585ceb4483ad9\img\img1.png
  • %User Temp%\DLG\ui\common\base\css\style.css
  • %User Temp%\DLG\ui\common\base\js\jquery-1.10.2.min.js
  • %User Temp%\DLG\ui\offers\d033278d2583e0fe2b7585ceb4483ad9\js\jquery-1.10.2.min.js
  • %User Temp%\DLG\ui\offers\d1218f43853f973f710cba676ef66845\index.html
  • %User Temp%\DLG\ui\offers\d1218f43853f973f710cba676ef66845\css\style.css
  • %User Temp%\DLG\ui\offers\d1218f43853f973f710cba676ef66845\img\img1.png
  • %User Temp%\DLG\ui\common\progress\index.html
  • %User Temp%\DLG\ui\offers\d1218f43853f973f710cba676ef66845\js\jquery-1.10.2.min.js
  • %User Temp%\DLG\ui\common\progress\css\style.css
  • %User Temp%\DLG\ui\common\progress\img\151.gif
  • %User Temp%\DLG\ui\common\progress\img\bar-bg.png
  • %User Temp%\DLG\ui\common\progress\img\bar-lb.png
  • %User Temp%\DLG\ui\offers\1522ef138ba104249c3934a80811f825\index.html
  • %User Temp%\DLG\ui\offers\1522ef138ba104249c3934a80811f825\css\style.css
  • %User Temp%\DLG\ui\common\progress\img\bar-rb.png
  • %User Temp%\DLG\ui\common\last\index.html
  • %User Temp%\DLG\ui\offers\1522ef138ba104249c3934a80811f825\img\img1.png
  • %User Temp%\DLG\ui\offers\1522ef138ba104249c3934a80811f825\img\progress-bar.png
  • %User Temp%\DLG\ui\offers\1522ef138ba104249c3934a80811f825\img\progress.png
  • %User Temp%\DLG\ui\common\progress\img\br-b.png
  • %User Temp%\DLG\ui\offers\1522ef138ba104249c3934a80811f825\js\jquery-1.10.2.min.js
  • %User Temp%\DLG\ui\common\last\css\style.css
  • %User Temp%\DLG\ui\common\progress\img\br-bg.png
  • %User Temp%\DLG\ui\common\progress\img\br-lb.png
  • %User Temp%\DLG\ui\common\progress\img\br-rb.png
  • %User Temp%\DLG\ui\common\progress\img\icon.png
  • %User Temp%\DLG\ui\common\last\img\img1.png
  • %User Temp%\DLG\ui\common\progress\img\img1.png
  • %User Temp%\DLG\ui\common\progress\img\progress-bar.png
  • %User Temp%\DLG\ui\common\last\js\jquery-1.10.2.min.js
  • %User Temp%\DLG\ui\common\progress\img\progress.png
  • %User Temp%\DLG\ui\common\progress\js\jquery-1.10.2.min.js

(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, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, and 8.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://dlg-configs.{BLOCKED}n.de
  • http://az687722.{BLOCKED}o.msecnd.net/{random path}
  • {BLOCKED}0.1
  • {BLOCKED}.156.71
  • {BLOCKED}.27.88
  • {BLOCKED}81.200

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.8

SSAPI PATTERN File:

1.987.00

SSAPI PATTERN Date:

09 Aug 2018

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 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.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows Script
    • Settings

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\Windows Script\Settings
    • JITDebug = "0"

Step 4

Search and delete these components

[ Learn More ]
There may be some components 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%\DLG1.tmp
  • %User Temp%\DLG\dlgres\DLG-Product-Logo.png
  • %User Temp%\DLG\initWindow\css\style.css
  • %User Temp%\DLG\initWindow\noconnection.html
  • %User Temp%\DLG\initWindow\progress.html
  • %User Temp%\DLG\loadingImage\loadingImage.bmp
  • %User Temp%\DLG\ui\offers\d033278d2583e0fe2b7585ceb4483ad9\index.html
  • %User Temp%\DLG\ui\offers\d033278d2583e0fe2b7585ceb4483ad9\css\style.css
  • %User Temp%\DLG\ui\common\base\index.html
  • %User Temp%\DLG\ui\offers\d033278d2583e0fe2b7585ceb4483ad9\img\img1.png
  • %User Temp%\DLG\ui\common\base\css\style.css
  • %User Temp%\DLG\ui\common\base\js\jquery-1.10.2.min.js
  • %User Temp%\DLG\ui\offers\d033278d2583e0fe2b7585ceb4483ad9\js\jquery-1.10.2.min.js
  • %User Temp%\DLG\ui\offers\d1218f43853f973f710cba676ef66845\index.html
  • %User Temp%\DLG\ui\offers\d1218f43853f973f710cba676ef66845\css\style.css
  • %User Temp%\DLG\ui\offers\d1218f43853f973f710cba676ef66845\img\img1.png
  • %User Temp%\DLG\ui\common\progress\index.html
  • %User Temp%\DLG\ui\offers\d1218f43853f973f710cba676ef66845\js\jquery-1.10.2.min.js
  • %User Temp%\DLG\ui\common\progress\css\style.css
  • %User Temp%\DLG\ui\common\progress\img\151.gif
  • %User Temp%\DLG\ui\common\progress\img\bar-bg.png
  • %User Temp%\DLG\ui\common\progress\img\bar-lb.png
  • %User Temp%\DLG\ui\offers\1522ef138ba104249c3934a80811f825\index.html
  • %User Temp%\DLG\ui\offers\1522ef138ba104249c3934a80811f825\css\style.css
  • %User Temp%\DLG\ui\common\progress\img\bar-rb.png
  • %User Temp%\DLG\ui\common\last\index.html
  • %User Temp%\DLG\ui\offers\1522ef138ba104249c3934a80811f825\img\img1.png
  • %User Temp%\DLG\ui\offers\1522ef138ba104249c3934a80811f825\img\progress-bar.png
  • %User Temp%\DLG\ui\offers\1522ef138ba104249c3934a80811f825\img\progress.png
  • %User Temp%\DLG\ui\common\progress\img\br-b.png
  • %User Temp%\DLG\ui\offers\1522ef138ba104249c3934a80811f825\js\jquery-1.10.2.min.js
  • %User Temp%\DLG\ui\common\last\css\style.css
  • %User Temp%\DLG\ui\common\progress\img\br-bg.png
  • %User Temp%\DLG\ui\common\progress\img\br-lb.png
  • %User Temp%\DLG\ui\common\progress\img\br-rb.png
  • %User Temp%\DLG\ui\common\progress\img\icon.png
  • %User Temp%\DLG\ui\common\last\img\img1.png
  • %User Temp%\DLG\ui\common\progress\img\img1.png
  • %User Temp%\DLG\ui\common\progress\img\progress-bar.png
  • %User Temp%\DLG\ui\common\last\js\jquery-1.10.2.min.js
  • %User Temp%\DLG\ui\common\progress\img\progress.png
  • %User Temp%\DLG\ui\common\progress\js\jquery-1.10.2.min.js

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.
  • %User Temp%\DLG
  • %User Temp%\DLG\requirements
  • %User Temp%\DLG\dlgres
  • %System Root%\DOCUME~1
  • %System Root%\DOCUME~1\Wilbert
  • %User Profile%\LOCALS~1
  • %User Temp%\DLG\initWindow
  • %User Temp%\DLG\initWindow\css
  • %User Temp%\DLG\loadingImage
  • %User Temp%\DLG\ui
  • %User Temp%\DLG\ui\common
  • %User Temp%\DLG\ui\common\base
  • %User Temp%\DLG\ui\common\progress
  • %User Temp%\DLG\ui\common\last
  • %User Temp%\DLG\ui\offers
  • %User Temp%\DLG\ui\offers\1522ef138ba104249c3934a80811f825
  • %User Temp%\DLG\ui\offers\d1218f43853f973f710cba676ef66845
  • %User Temp%\DLG\ui\offers\d033278d2583e0fe2b7585ceb4483ad9
  • %User Temp%\DLG\ui\offers\d033278d2583e0fe2b7585ceb4483ad9\css
  • %User Temp%\DLG\ui\offers\d033278d2583e0fe2b7585ceb4483ad9\img
  • %User Temp%\DLG\ui\common\base\css
  • %User Temp%\DLG\ui\offers\d033278d2583e0fe2b7585ceb4483ad9\js
  • %User Temp%\DLG\ui\common\base\js
  • %User Temp%\DLG\ui\offers\d1218f43853f973f710cba676ef66845\css
  • %User Temp%\DLG\ui\offers\d1218f43853f973f710cba676ef66845\img
  • %User Temp%\DLG\ui\offers\d1218f43853f973f710cba676ef66845\js
  • %User Temp%\DLG\ui\common\progress\css
  • %User Temp%\DLG\ui\common\progress\img
  • %User Temp%\DLG\ui\offers\1522ef138ba104249c3934a80811f825\css
  • %User Temp%\DLG\ui\offers\1522ef138ba104249c3934a80811f825\img
  • %User Temp%\DLG\ui\offers\1522ef138ba104249c3934a80811f825\js
  • %User Temp%\DLG\ui\common\last\css
  • %User Temp%\DLG\ui\common\last\img
  • %User Temp%\DLG\ui\common\last\js
  • %User Temp%\DLG\ui\common\progress\js

Step 6

Scan your computer with your Trend Micro product to delete files detected as PUA_BILDDOWNLOADER. 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:

Step 7

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.

  • %User Temp%\DLG\test.part
  • %User Temp%\DLG\ui\offers\d033278d2583e0fe2b7585ceb4483ad9\uifile.zip.part
  • %User Temp%\DLG\ui\common\base\base.zip.part
  • %User Temp%\DLG\ui\offers\d1218f43853f973f710cba676ef66845\uifile.zip.part
  • %User Temp%\DLG\ui\common\progress\progress.zip.part
  • %User Temp%\DLG\ui\offers\1522ef138ba104249c3934a80811f825\uifile.zip.part
  • %User Temp%\DLG\ui\common\last\last.zip.part


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