Analysis by: Cris Nowell Pantanilla
ALIASES:

Downloader.Win32.Agent.bvot (Kaspersky), SoftwareBundler:Win32/OxyPumper (Microsoft)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 REPORTED INFECTION:

  • Threat Type: Potentially Unwanted Application

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet

This Potentially Unwanted Application arrives as a component bundled with malware/grayware packages. It may be manually installed by a user.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system. As of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size: 232,768 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 15 Nov 2016
Payload: Downloads files, Executes files

Arrival Details

This Potentially Unwanted Application arrives as a component bundled with malware/grayware packages.

It may be manually installed by a user.

Installation

This Potentially Unwanted Application then creates the following non-malicious file(s):

  • %User Temp%\config.xml - config file
  • %User Temp%\{filename}_{number}.log - Process logs

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp 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.)

It adds the following mutexes to ensure that only one of its copies runs at any one time:

  • DMUploader
  • Loader

Download Routine

This Potentially Unwanted Application accesses the following websites to download files:

  • http://{BLOCKED}alldream.com/download/altBlankNet2.dat
  • http://{BLOCKED}alldream.com/download/altBlankNet4.dat

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

As of this writing, the said sites are inaccessible.

Other Details

This Potentially Unwanted Application connects to the following possibly malicious URL:

  • http://www.{BLOCKED}t-landing.com/api/wwwurl/1

It does the following:

  • It saves the following information into the created Process Logs:
    • Program build
    • Windows version
    • Processor Architecture
    • Anti-Virus Installed
    • Default Browser Path
    • Process list
    • Temporary folder
    • Process Image Path
    • Download status

  SOLUTION

Minimum Scan Engine: 9.800
SSAPI PATTERN File: 1.784.46
SSAPI PATTERN Date: 15 Nov 2016

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

Search and delete these files

[ 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 Temp%\config.xml
%User Temp%\{filename}_{number}.log

Step 3

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