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TROJ_AGENT.GD

May 10, 2013
 ALIASES:

TrojanDropper:Win32/Agent.HT (Microsoft); MultiDropper-OH (McAfee); Trojan.Elitebar (Symantec); Trojan-Dropper.Win32.Agent.kd (Kaspersky); BehavesLike.Win32.Malware.ssc (mx-v), SearchMiracle.EliteBar (Sunbelt); Trojan.Generic.2154120 (FSecure)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It deletes the initially executed copy of itself.

  TECHNICAL DETAILS

File Size:

200,704 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

28 Dec 2011

Arrival Details

This Trojan 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 Trojan creates the following folders:

  • %Windows%\EliteToolBar\
  • %Windows%\EliteToolBar
  • %Windows%\EliteToolBar\xml
  • %Windows%\EliteToolBar\xml\categories
  • %Windows%\EliteToolBar\xml\images

(Note: %Windows% is the Windows folder, which is usually C:\Windows.)

Autostart Technique

This Trojan registers itself as a BHO to ensure its automatic execution every time Internet Explorer is used by adding the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{28CAEFF3-0F18-4036-B504-51D73BD81ABC}

Other System Modifications

This Trojan deletes the following files:

  • %System Root%\DelUS.bat
  • %Windows%\EliteToolBar\EliteToolBar version 60.dll

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %Windows% is the Windows folder, which is usually C:\Windows.)

It adds the following registry keys:

HKEY_LOCAL_MACHINE\Software\Elitum\
EliteToolBar

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
EliteBar Internet Explorer Toolbar

HKEY_CLASSES_ROOT\CLSID\{28CAEFF3-0F18-4036-B504-51D73BD81ABC}\
Programmable

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Elitum\
EliteToolBar
AccountNumber = "{malware file name}"

HKEY_LOCAL_MACHINE\SOFTWARE\Elitum\
EliteToolBar
path = "%Windows%\EliteToolBar\"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
EliteBar Internet Explorer Toolbar
UninstallString = "regsvr32 /s /u "%Windows%\EliteToolBar\EliteToolBar version 60.dll""

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
EliteBar Internet Explorer Toolbar
DisplayName = "EliteBar Internet Explorer Toolbar"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
EliteBar Internet Explorer Toolbar
DisplayIcon = ""%Windows%\EliteToolBar\EliteToolBar version 60.dll", 1"

HKEY_LOCAL_MACHINE\SOFTWARE\Elitum\
EliteToolBar
UpdateDate = "010101"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Toolbar\WebBrowser
{825CF5BD-8862-4430-B771-0C15C5CA8DEF} = {random values}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{28CAEFF3-0F18-4036-B504-51D73BD81ABC}\InprocServer32
ThreadingModel = "Apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{825CF5BD-8862-4430-B771-0C15C5CA8DEF}\InprocServer32
ThreadingModel = "Apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Elitum\
EliteToolBar
uninstalled = "no"

HKEY_LOCAL_MACHINE\SOFTWARE\Elitum\
EliteToolBar
FirstTimeStarted = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Elitum\
EliteToolBar
AutoComplete = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Elitum\
EliteToolBar
ac1 = "adult"

HKEY_LOCAL_MACHINE\SOFTWARE\Elitum\
EliteToolBar
adult.tbr = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Elitum\
EliteToolBar
popupblocker = "no"

HKEY_LOCAL_MACHINE\SOFTWARE\Elitum\
EliteToolBar
popups = "yes"

HKEY_LOCAL_MACHINE\SOFTWARE\Elitum\
EliteToolBar
pthreshold = "5"

HKEY_LOCAL_MACHINE\SOFTWARE\Elitum\
EliteToolBar
default.tbr = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Elitum\
EliteToolBar
search.mnu = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Elitum\
EliteToolBar
version = "60"

Dropping Routine

This Trojan drops the following files:

  • \DelUS.bat
  • %Program Files%\sdf.exe
  • %Program Files%\ddd.exe
  • %User Temp%\ims1.tmp
  • %User Temp%\39890.dll
  • %User Temp%\install.reg
  • %System Root%\temp.bat
  • %System%\elitepyn32.exe

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).. %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.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %System% is the Windows system folder, which is usually C:\Windows\System32.)

Other Details

This Trojan deletes the initially executed copy of itself

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.200

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

Close all opened browser windows

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\Elitum
    • EliteToolBar
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
    • EliteBar Internet Explorer Toolbar
  • In HKEY_CLASSES_ROOT\CLSID\{28CAEFF3-0F18-4036-B504-51D73BD81ABC}
    • Programmable

Step 4

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\Elitum\EliteToolBar
    • AccountNumber="{malware file name}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Elitum\EliteToolBar
    • path="%Windows%\EliteToolBar\"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\EliteBar Internet Explorer Toolbar
    • UninstallString="regsvr32 /s /u "%Windows%\EliteToolBar\EliteToolBar version 60.dll""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\EliteBar Internet Explorer Toolbar
    • DisplayName="EliteBar Internet Explorer Toolbar"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\EliteBar Internet Explorer Toolbar
    • DisplayIcon=""%Windows%\EliteToolBar\EliteToolBar version 60.dll", 1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Elitum\EliteToolBar
    • UpdateDate="010101"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Toolbar\WebBrowser
    • {825CF5BD-8862-4430-B771-0C15C5CA8DEF}={random values}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{28CAEFF3-0F18-4036-B504-51D73BD81ABC}\InprocServer32
    • ThreadingModel="Apartment"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{825CF5BD-8862-4430-B771-0C15C5CA8DEF}\InprocServer32
    • ThreadingModel="Apartment"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Elitum\EliteToolBar
    • uninstalled="no"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Elitum\EliteToolBar
    • FirstTimeStarted=1
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Elitum\EliteToolBar
    • AutoComplete=1
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Elitum\EliteToolBar
    • ac1="adult"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Elitum\EliteToolBar
    • adult.tbr="0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Elitum\EliteToolBar
    • popupblocker="no"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Elitum\EliteToolBar
    • popups="yes"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Elitum\EliteToolBar
    • pthreshold="5"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Elitum\EliteToolBar
    • default.tbr="0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Elitum\EliteToolBar
    • search.mnu="0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Elitum\EliteToolBar
    • version="60"

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.
  • %Windows%\EliteToolBar\
  • %Windows%\EliteToolBar
  • %Windows%\EliteToolBar\xml
  • %Windows%\EliteToolBar\xml\categories
  • %Windows%\EliteToolBar\xml\images

Step 6

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.
  • \DelUS.bat
  • %Program Files%\sdf.exe
  • %Program Files%\ddd.exe
  • %User Temp%\ims1.tmp
  • %User Temp%\39890.dll
  • %User Temp%\install.reg
  • %System Root%\temp.bat
  • %System%\elitepyn32.exe

Step 7

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

Step 8

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %System Root%\DelUS.bat
  • %Windows%\EliteToolBar\EliteToolBar version 60.dll


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