Analysis by: Byron Jon Gelera
ALIASES:

Riskware/Wombat (Fortinet); PUP.Optional.FastestTube (Malwarebytes); PUA.Downloader (Symantec)

 PLATFORM:

Windows

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

  • Threat Type: Potentially Unwanted Application

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This potentially unwanted application 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: 1,613,024 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 13 Feb 2017

Arrival Details

This potentially unwanted application 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 potentially unwanted application adds the following folders:

  • %Program Files%\FastestTube\2.4.0.12

(Note: %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.)

It drops the following files:

  • %User Temp%\is-{random}.tmp\{malware name}.tmp
  • %User Temp%\is-{random}.tmp\_isetup\_shfoldr.dll
  • %User Temp%\is-{random}.tmp\nsProcessW_modified.dll
  • %User Temp%\is-{random}.tmp\logo.bmp
  • %User Temp%\is-{random}.tmp\details.bmp
  • %Program Files%\FastestTube\2.4.0.12\unins000.dat
  • %Program Files%\FastestTube\2.4.0.12\unins000.exe
  • %Program Files%\FastestTube\2.4.0.12\nsProcessW_modified.dll
  • %Program Files%\FastestTube\2.4.0.12\Updater.exe
  • %Program Files%\FastestTube\2.4.0.12\ad-checker.js
  • %Program Files%\FastestTube\2.4.0.12\adlesse_disabler.js
  • %Program Files%\FastestTube\2.4.0.12\cached_http_request.js
  • %Program Files%\FastestTube\2.4.0.12\config.xml
  • %Program Files%\FastestTube\2.4.0.12\extension_info.json
  • %Program Files%\FastestTube\2.4.0.12\fastesttube.css
  • %Program Files%\FastestTube\2.4.0.12\fastesttube.js
  • %Program Files%\FastestTube\2.4.0.12\fastesttube_bg.js
  • %Program Files%\FastestTube\2.4.0.12\fastesttube_old.js
  • %Program Files%\FastestTube\2.4.0.12\inject.js
  • %Program Files%\FastestTube\2.4.0.12\logger.js
  • %Program Files%\FastestTube\2.4.0.12\main.js
  • %Program Files%\FastestTube\2.4.0.12\page-context-inject.js
  • %Program Files%\FastestTube\2.4.0.12\script_loader.js
  • %Program Files%\FastestTube\2.4.0.12\statistics.js
  • %Program Files%\FastestTube\2.4.0.12\stop_autoplay.js
  • %Program Files%\FastestTube\2.4.0.12\storage.db
  • %Program Files%\FastestTube\2.4.0.12\storageKeys.json
  • %Program Files%\FastestTube\2.4.0.12\youtube_ad_remover.js
  • %Program Files%\FastestTube\2.4.0.12\icons\icon100.png
  • %Program Files%\FastestTube\2.4.0.12\icons\icon128.ico
  • %Program Files%\FastestTube\2.4.0.12\icons\icon128.png
  • %Program Files%\FastestTube\2.4.0.12\icons\icon32.png
  • %Program Files%\FastestTube\2.4.0.12\icons\icon48.png
  • %Program Files%\FastestTube\2.4.0.12\includes\contentProxy.js
  • %Program Files%\FastestTube\2.4.0.12\includes\frame2frame_messaging.js
  • %Program Files%\FastestTube\2.4.0.12\includes\frames_communicator_content.js
  • %Program Files%\FastestTube\2.4.0.12\includes\greasemonkey_client.js
  • %Program Files%\FastestTube\2.4.0.12\includes\invokeAsyncImpl.js
  • %Program Files%\FastestTube\2.4.0.12\includes\networkContentProxy.js
  • %Program Files%\FastestTube\2.4.0.12\wombat\browser.js
  • %Program Files%\FastestTube\2.4.0.12\wombat\console.js
  • %Program Files%\FastestTube\2.4.0.12\wombat\content_messages_loader.js
  • %Program Files%\FastestTube\2.4.0.12\wombat\content_scripts_at_start_loader.js
  • %Program Files%\FastestTube\2.4.0.12\wombat\content_scripts_loader.js
  • %Program Files%\FastestTube\2.4.0.12\wombat\deferred.js
  • %Program Files%\FastestTube\2.4.0.12\wombat\downloads.js
  • %Program Files%\FastestTube\2.4.0.12\wombat\event_listener.js
  • %Program Files%\FastestTube\2.4.0.12\wombat\event_listener_common.js
  • %Program Files%\FastestTube\2.4.0.12\wombat\frames_communicator_background.js
  • %Program Files%\FastestTube\2.4.0.12\wombat\greasemonkey.js
  • %Program Files%\FastestTube\2.4.0.12\wombat\greasemonkey_init.js
  • %Program Files%\FastestTube\2.4.0.12\wombat\i18n.js
  • %Program Files%\FastestTube\2.4.0.12\wombat\init.js
  • %Program Files%\FastestTube\2.4.0.12\wombat\invokeAsyncImpl.js
  • %Program Files%\FastestTube\2.4.0.12\wombat\io.js
  • %Program Files%\FastestTube\2.4.0.12\wombat\json.js
  • %Program Files%\FastestTube\2.4.0.12\wombat\messages.js
  • %Program Files%\FastestTube\2.4.0.12\wombat\messages_bgClient.js
  • %Program Files%\FastestTube\2.4.0.12\wombat\network.js
  • %Program Files%\FastestTube\2.4.0.12\wombat\storage.js
  • %Program Files%\FastestTube\2.4.0.12\wombat\system.js
  • %Program Files%\FastestTube\2.4.0.12\wombat\timer.js
  • %Program Files%\FastestTube\2.4.0.12\wombat\toolbox.js
  • %Program Files%\FastestTube\2.4.0.12\wombat\wombat.js
  • %Program Files%\FastestTube\2.4.0.12\wombat\xml.js
  • %Program Files%\FastestTube\2.4.0.12\_locales\en\messages.json
  • %Program Files%\FastestTube\2.4.0.12\_locales\ja\messages.json
  • %Program Files%\FastestTube\2.4.0.12\_locales\ru\messages.json
  • %Program Files%\FastestTube\2.4.0.12\WombatBHO.dll
  • %Program Files%\FastestTube\2.4.0.12\ph.dll
  • %Program Files%\FastestTube\2.4.0.12\storage.db
  • %All User Profile%\Start Menu\Programs\FastestTube\FastestTube Update Options.lnk
  • %All User Profile%\Start Menu\Programs\FastestTube\Uninstall FastestTube.lnk

(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.. %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.)

It drops the following component file(s):

  • %Windows%\Tasks\FastestTube Updater.job

(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

Other System Modifications

This potentially unwanted application adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\FastestTube\
Updater

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
FastestTube_is1

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\FastestTube\
Updater\States
state = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\FastestTube\
Updater
{default} = "%Program Files%\FastestTube\2.4.0.12"

HKEY_LOCAL_MACHINE\SOFTWARE\FastestTube\
Updater
Version = "1.5"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
FastestTube_is1
Inno Setup: Setup Version = 5.5.5 (u)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
FastestTube_is1
Inno Setup: App Path = "%Program Files%\FastestTube\2.4.0.12"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
FastestTube_is1
InstallLocation = "%Program Files%\FastestTube\2.4.0.12\"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
FastestTube_is1
Inno Setup: Icon Group = "FastestTube"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
FastestTube_is1
Inno Setup: User = {value}

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
FastestTube_is1
Inno Setup: Language = "english"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
FastestTube_is1
DisplayName = "FastestTube-2.4.0.12"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
FastestTube_is1
DisplayIcon = "%Program Files%\FastestTube\2.4.0.12\icons\icon128.ico"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
FastestTube_is1
UninstallString = "%Program Files%\FastestTube\2.4.0.12\unins000.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
FastestTube_is1
QuietUninstallString = "%Program Files%\FastestTube\2.4.0.12\unins000.exe" /SILENT

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
FastestTube_is1
Publisher = Kwizzu

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
FastestTube_is1
NoModify = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
FastestTube_is1
NoRepair = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
FastestTube_is1
InstallDate = {value}

  SOLUTION

Minimum Scan Engine: 9.850

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_LOCAL_MACHINE\SOFTWARE\FastestTube
    • Updater
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
    • FastestTube_is1

Step 4

Search and delete this folder

[ 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.
  • %Program Files%\FastestTube\2.4.0.12\

Step 5

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.
  • %User Temp%\is-{random}.tmp\{malware name}.tmp
  • %User Temp%\is-{random}.tmp\_isetup\_shfoldr.dll
  • %User Temp%\is-{random}.tmp\nsProcessW_modified.dll
  • %User Temp%\is-{random}.tmp\logo.bmp
  • %User Temp%\is-{random}.tmp\details.bmp
  • %All User Profile%\Start Menu\Programs\FastestTube\FastestTube Update Options.lnk
  • %All User Profile%\Start Menu\Programs\FastestTube\Uninstall FastestTube.lnk

Step 6

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