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ADW_DELTADS.GA

April 28, 2017
 Analysis by: Byron Jon Gelera
 ALIASES:

PUP.Optional.OptiAds (Malwarebytes); Adware.OptiAds.B (F-Secure)

 PLATFORM:

Windows

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

  • Threat Type: Adware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Adware may arrive bundled with malware packages as a malware component. It 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:

651,168 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

25 Apr 2017

Arrival Details

This Adware may arrive bundled with malware packages as a malware component.

It 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 files:

  • {Malware Path}\app.ini

Other System Modifications

This Adware adds the following registry keys:

HKEY_CURRENT_USER\Software\Classes\
keepmysearch\instl\data

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main\FeatureControl\
FEATURE_BROWSER_EMULATION

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main\FeatureControl\
FEATURE_BROWSER_EMULATION
{malware file name} = "10000"

Other Details

This Adware connects to the following possibly malicious URL:

  • http://{BLOCKED}es.downloadbeam.com/cnfg/boot2.srf?prdct={MMPRDCT}&vrsn={VRSN}&instlDate={instlDay}&smplGrp={SMPLGRP}&afltId={afltId}&hrdId={ID}&apps={APPS}&tlbrid=base&instlRef={INSTLREF}&prms={appPrms}&rd=1&sprtChrPp=1&tag={TAG}&actv=&allv=
  • http://{BLOCKED}es.adzby.com/cnfg/boot2.srf??prdct={MMPRDCT}&vrsn={VRSN}&instlDate={instlDay}&smplGrp={SMPLGRP}&afltId={afltId}&hrdId={ID}&apps={APPS}&tlbrid=base&instlRef={INSTLREF}&prms={appPrms}&rd=1&sprtChrPp=1&tag={TAG}&actv=&allv=
  • http://cdn.{BLOCKED}y.com/boot/cnfg/.js?v=11
  • http://cdn.{BLOCKED}y.com/boot/js/jquery.min.js?v=11
  • http://cdn.{BLOCKED}y.com/boot/js/json2.js?v=11
  • http://cdn.{BLOCKED}y.com/boot/js/loader.js?v=11
  • http://cdn.{BLOCKED}y.com/boot/js/mainBase.js?v=11

  SOLUTION

Minimum Scan Engine:

9.850

SSAPI PATTERN File:

1.831.00

SSAPI PATTERN Date:

27 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

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\Classes\keepmysearch\instl
    • data
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl
    • FEATURE_BROWSER_EMULATION

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.  
  • {Malware Path}\app.ini

Step 5

Scan your computer with your Trend Micro product to delete files detected as ADW_DELTADS.GA. 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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