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ADW_MINTCOS

July 14, 2014
 ALIASES:

RDN/Downloader.a!rp (McAfee); Trojan.Win32.Badur.ijtb (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Found Win32/DH.FF8200A4{gRI0gQ4} (AVG)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

 OVERALL RISK RATING:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • Threat Type: Adware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


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:

266,240 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

14 Jul 2014

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 creates the following folders:

  • %User Temp%/3ea6275f
  • %User Temp%/3ea6275f/yo-8csfd@oeudbkng-.net
  • %User Temp%/3ea6275f/yo-8csfd@oeudbkng-.net/content
  • %User Temp%/3ea6275f/ehfhnadicnlnooagobpkkcgidbdmfepg

(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 System Modifications

This adware adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Google\
Update\ClientState\{8A69D345-D564-463C-AFF1-A69D9E530F96}

HKEY_LOCAL_MACHINE\SOFTWARE\Google\
Update\ClientState\{4DC8B4CA-1BDA-483e-B5FA-D3C12E15B62D}

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Google\
Update\ClientState\{8A69D345-D564-463C-AFF1-A69D9E530F96}
ap = "2.0-dev-multi-chrome"

HKEY_LOCAL_MACHINE\SOFTWARE\Google\
Update\ClientState\{4DC8B4CA-1BDA-483e-B5FA-D3C12E15B62D}
ap = "-dev-multi-chrome"

Dropping Routine

This adware drops the following files:

  • %User Temp%\294823_.exe
  • %User Temp%/3ea6275f/s3f.dat
  • %User Temp%/3ea6275f/s3f.exe
  • %User Temp%/3ea6275f/TU.x64.dll
  • %User Temp%/3ea6275f/TU.tlb
  • %User Temp%/3ea6275f/TU.dll
  • %User Temp%/3ea6275f/yo-8csfd@oeudbkng-.net/content/bg.js
  • %User Temp%/3ea6275f/yo-8csfd@oeudbkng-.net/install.rdf
  • %User Temp%/3ea6275f/yo-8csfd@oeudbkng-.net/chrome.manifest
  • %User Temp%/3ea6275f/yo-8csfd@oeudbkng-.net/bootstrap.js
  • %User Temp%/3ea6275f/ehfhnadicnlnooagobpkkcgidbdmfepg/lsdb.js
  • %User Temp%/3ea6275f/ehfhnadicnlnooagobpkkcgidbdmfepg/content.js
  • %User Temp%/3ea6275f/ehfhnadicnlnooagobpkkcgidbdmfepg/manifest.json
  • %User Temp%/3ea6275f/ehfhnadicnlnooagobpkkcgidbdmfepg/background.html
  • %User Temp%/3ea6275f/ehfhnadicnlnooagobpkkcgidbdmfepg/mzIo.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 and 7.)

Other Details

This adware connects to the following possibly malicious URL:

  • http://download.{BLOCKED}n.info/?{random characters}
  • {BLOCKED}1.117.97

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.700

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_LOCAL_MACHINE\SOFTWARE\Google\Update\ClientState
    • {8A69D345-D564-463C-AFF1-A69D9E530F96}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Google\Update\ClientState
    • {4DC8B4CA-1BDA-483e-B5FA-D3C12E15B62D}

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_LOCAL_MACHINE\SOFTWARE\Google\Update\ClientState\{8A69D345-D564-463C-AFF1-A69D9E530F96}
    • ap = "2.0-dev-multi-chrome"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Google\Update\ClientState\{4DC8B4CA-1BDA-483e-B5FA-D3C12E15B62D}
    • ap = "-dev-multi-chrome"

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%\294823_.exe
  • %User Temp%/3ea6275f/s3f.dat
  • %User Temp%/3ea6275f/s3f.exe
  • %User Temp%/3ea6275f/TU.x64.dll
  • %User Temp%/3ea6275f/TU.tlb
  • %User Temp%/3ea6275f/TU.dll
  • %User Temp%/3ea6275f/yo-8csfd@oeudbkng-.net/content/bg.js
  • %User Temp%/3ea6275f/yo-8csfd@oeudbkng-.net/install.rdf
  • %User Temp%/3ea6275f/yo-8csfd@oeudbkng-.net/chrome.manifest
  • %User Temp%/3ea6275f/yo-8csfd@oeudbkng-.net/bootstrap.js
  • %User Temp%/3ea6275f/ehfhnadicnlnooagobpkkcgidbdmfepg/lsdb.js
  • %User Temp%/3ea6275f/ehfhnadicnlnooagobpkkcgidbdmfepg/content.js
  • %User Temp%/3ea6275f/ehfhnadicnlnooagobpkkcgidbdmfepg/manifest.json
  • %User Temp%/3ea6275f/ehfhnadicnlnooagobpkkcgidbdmfepg/background.html
  • %User Temp%/3ea6275f/ehfhnadicnlnooagobpkkcgidbdmfepg/mzIo.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%/3ea6275f
  • %User Temp%/3ea6275f/yo-8csfd@oeudbkng-.net
  • %User Temp%/3ea6275f/yo-8csfd@oeudbkng-.net/content
  • %User Temp%/3ea6275f/ehfhnadicnlnooagobpkkcgidbdmfepg

Step 6

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