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ADW_BRANTALL
Aliases: TrojanDownloader:Win32/Brantall.C (Microsoft); InstallBrain (fs) (Sunbelt)
Malware type: Adware
Destructive: No
Platform: Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
In the wild: Yes

Overview


Infection Channel: Dropped by other malware, Downloaded from the Internet

This adware 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: 718,720 bytes
File type: EXE
Memory resident: No
Initial samples received date: 19 Jun 2014
Payload: Drops files, Connects to URLs/IPs

Arrival Details

This adware 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 adware drops the following copies of itself into the affected system:

  • %User Temp%\PC Performer613879.exe

(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 and 7.)

It creates the following folders:

  • %All Users Profile%\IBUpdaterService
  • %User Temp%\ibtmp90bb489 - deleted afterwards
  • %User Temp%\ibtmp90bb489\config - deleted afterwards
  • %User Temp%\ibtmp90bb489\config\events - deleted afterwards
  • %User Temp%\ibtmp90bb489\config\conditions - deleted afterwards

(Note: %All Users Profile% is the All Users or Common profile folder, which is C:\Documents and Settings\All Users in Windows 2000, XP, and Server 2003, and C:\ProgramData in Windows Vista and 7.. %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 and 7.)

Other System Modifications

This adware adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Windows Script\Settings

HKEY_CURRENT_USER\Software\Microsoft\
Windows Script

It adds the following registry entries:

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

Dropping Routine

This adware drops the following files:

  • %User Temp%\ibtmp90bb489\config\conditions\conditions.js - deleted afterwards
  • %User Temp%\ibtmp90bb489\config\events\events.js - deleted afterwards
  • %User Temp%\ibtmp90bb489\intallLog - deleted afterwards
  • %User Profile%\IBUpdaterService\repository.xml

(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 and 7.. %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.)

Download Routine

This adware saves the files it downloads using the following names:

  • %User Temp%\ConduitChecker.exe - also detected as ADW_BRANTALL

(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 and 7.)

Other Details

This adware connects to the following possibly malicious URL:

  • http://api.{BLOCKED}o.com/utils/dns?cid={random}
  • http://www.{BLOCKED}tech.com/
  • http://{BLOCKED}-182385724-1591972470.us-east-1.elb.{BLOCKED}aws.com/service/country.php
  • http://www.{BLOCKED}tech.com/service/country.php
  • http://www.{BLOCKED}tech.com/files/components/conduit_checker.exe - download file also detected as ADW_BRANTALL

NOTES:

It notifies the following URLs for the installation:

  • http://api.{BLOCKED}o.com/track/ib-start?cid={random}
  • http://{BLOCKED}l.{BLOCKED}o.com/installer/{random characters}
  • http://api.{BLOCKED}o.com/track/ib-install?cid={random}&componentid={random}
  • http://api.{BLOCKED}o.com/track/ib-finish?cid={random}

Solution


Minimum scan engine: 9.700
SSAPI Pattern File: 1.502.26
SSAPI Pattern Release Date: 21 Apr 2014

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

Step 3

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.
  • %All Users Profile%\IBUpdaterService

Step 4

Scan your computer with your Trend Micro product to delete files detected as ADW_BRANTALL. 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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Analysis By: Automation
Modified By: Jimelle Monteser

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