TROJ_AGENT.BCGG


 ALIASES:

[6.nsis]:Generic.tfr!bu (McAfee); ARC:NSIS (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); MemScan:Trojan.Generic.5481775 (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.

  TECHNICAL DETAILS

File Size:

161,374 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

19 May 2012

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:

  • %System Root%\Documents and Settings\Administrator

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

Other System Modifications

This Trojan deletes the following files:

  • %User Temp%\nsc1.tmp

(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.)

It adds the following registry keys:

HKEY_CURRENT_USER\Software\kdisk_barcon01

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
barcon

HKEY_CLASSES_ROOT\TestExtension.MasterObject.1

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TestExtension.MasterObject.1\CLSID

HKEY_CLASSES_ROOT\TestExtension.MasterObject

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TestExtension.MasterObject\CLSID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TestExtension.MasterObject\CurVer

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{D700729C-E1F0-4D92-8C00-DEDEB6A69D88}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{D700729C-E1F0-4D92-8C00-DEDEB6A69D88}\ProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{D700729C-E1F0-4D92-8C00-DEDEB6A69D88}\VersionIndependentProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{D700729C-E1F0-4D92-8C00-DEDEB6A69D88}\Programmable

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{D700729C-E1F0-4D92-8C00-DEDEB6A69D88}\InprocServer32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{D700729C-E1F0-4D92-8C00-DEDEB6A69D88}\TypeLib

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Extensions\{C1F0024B-8278-4999-B7E6-2718426D9FE6}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{B4DDB057-9EDC-45B5-89A3-8CAD9F265F1E}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{B4DDB057-9EDC-45B5-89A3-8CAD9F265F1E}\1.0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{B4DDB057-9EDC-45B5-89A3-8CAD9F265F1E}\1.0\
FLAGS

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{B4DDB057-9EDC-45B5-89A3-8CAD9F265F1E}\1.0\
0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{B4DDB057-9EDC-45B5-89A3-8CAD9F265F1E}\1.0\
0\win32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{B4DDB057-9EDC-45B5-89A3-8CAD9F265F1E}\1.0\
HELPDIR

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{D89080BE-5019-4399-96E1-2A0E32AEF599}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{D89080BE-5019-4399-96E1-2A0E32AEF599}\ProxyStubClsid

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{D89080BE-5019-4399-96E1-2A0E32AEF599}\ProxyStubClsid32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{D89080BE-5019-4399-96E1-2A0E32AEF599}\TypeLib

It adds the following registry entries:

HKEY_CURRENT_USER\Software\kdisk_barcon01
installed = "1"

HKEY_CURRENT_USER\Software\kdisk_barcon01
cp_code = "pandorabc_05"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
barcon
DisplayName = "ÃֽſµÈ­ ´Ù¿î¹Þ±â"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
barcon
DisplayIcon = "%System%\movie6.ico"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
barcon
DisplayVersion = "1.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
barcon
UninstallString = "%System%\Uninstallbarcon.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{D700729C-E1F0-4D92-8C00-DEDEB6A69D88}\InprocServer32
ThreadingModel = "Apartment"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Extensions\{C1F0024B-8278-4999-B7E6-2718426D9FE6}
ButtonText = "ÃֽſµÈ­ ´Ù¿î¹Þ±â"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Extensions\{C1F0024B-8278-4999-B7E6-2718426D9FE6}
Icon = "%System%\barcon.dll,201"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Extensions\{C1F0024B-8278-4999-B7E6-2718426D9FE6}
HotIcon = "%System%\barcon.dll,202"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Extensions\{C1F0024B-8278-4999-B7E6-2718426D9FE6}
CLSID = "{1FBA04EE-3024-11d2-8F1F-0000F87ABD16}"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Extensions\{C1F0024B-8278-4999-B7E6-2718426D9FE6}
ClsidExtension = "{D700729C-E1F0-4D92-8C00-DEDEB6A69D88}"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Extensions\{C1F0024B-8278-4999-B7E6-2718426D9FE6}
Default Visible = "yes"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{D89080BE-5019-4399-96E1-2A0E32AEF599}\TypeLib
Version = "1.0"

Dropping Routine

This Trojan drops the following files:

  • %User Profile%\Application Data\SetupHlpr.exe
  • %User Profile%\Application Data\movie6.ico
  • %Desktop%\ÃֽſµÈ­ ´Ù¿î¹Þ±â.lnk
  • %System%\barcon.dll
  • %System%\movie6.ico
  • %System%\SetupHlpr.exe
  • %System%\Uninstallbarcon.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Desktop on Windows Vista and 7.. %System% is the Windows system folder, which is usually C:\Windows\System32.)

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

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
    • kdisk_barcon01
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
    • barcon
  • In HKEY_CLASSES_ROOT
    • TestExtension.MasterObject.1
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TestExtension.MasterObject.1
    • CLSID
  • In HKEY_CLASSES_ROOT
    • TestExtension.MasterObject
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TestExtension.MasterObject
    • CLSID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TestExtension.MasterObject
    • CurVer
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
    • {D700729C-E1F0-4D92-8C00-DEDEB6A69D88}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{D700729C-E1F0-4D92-8C00-DEDEB6A69D88}
    • ProgID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{D700729C-E1F0-4D92-8C00-DEDEB6A69D88}
    • VersionIndependentProgID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{D700729C-E1F0-4D92-8C00-DEDEB6A69D88}
    • Programmable
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{D700729C-E1F0-4D92-8C00-DEDEB6A69D88}
    • InprocServer32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{D700729C-E1F0-4D92-8C00-DEDEB6A69D88}
    • TypeLib
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Extensions
    • {C1F0024B-8278-4999-B7E6-2718426D9FE6}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib
    • {B4DDB057-9EDC-45B5-89A3-8CAD9F265F1E}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{B4DDB057-9EDC-45B5-89A3-8CAD9F265F1E}
    • 1.0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{B4DDB057-9EDC-45B5-89A3-8CAD9F265F1E}\1.0
    • FLAGS
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{B4DDB057-9EDC-45B5-89A3-8CAD9F265F1E}\1.0
    • 0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{B4DDB057-9EDC-45B5-89A3-8CAD9F265F1E}\1.0\0
    • win32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{B4DDB057-9EDC-45B5-89A3-8CAD9F265F1E}\1.0
    • HELPDIR
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
    • {D89080BE-5019-4399-96E1-2A0E32AEF599}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{D89080BE-5019-4399-96E1-2A0E32AEF599}
    • ProxyStubClsid
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{D89080BE-5019-4399-96E1-2A0E32AEF599}
    • ProxyStubClsid32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{D89080BE-5019-4399-96E1-2A0E32AEF599}
    • TypeLib

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_CURRENT_USER\Software\kdisk_barcon01
    • installed = "1"
  • In HKEY_CURRENT_USER\Software\kdisk_barcon01
    • cp_code = "pandorabc_05"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\barcon
    • DisplayName = "ÃֽſµÈ­ ´Ù¿î¹Þ±â"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\barcon
    • DisplayIcon = "%System%\movie6.ico"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\barcon
    • DisplayVersion = "1.0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\barcon
    • UninstallString = "%System%\Uninstallbarcon.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{D700729C-E1F0-4D92-8C00-DEDEB6A69D88}\InprocServer32
    • ThreadingModel = "Apartment"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Extensions\{C1F0024B-8278-4999-B7E6-2718426D9FE6}
    • ButtonText = "ÃֽſµÈ­ ´Ù¿î¹Þ±â"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Extensions\{C1F0024B-8278-4999-B7E6-2718426D9FE6}
    • Icon = "%System%\barcon.dll,201"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Extensions\{C1F0024B-8278-4999-B7E6-2718426D9FE6}
    • HotIcon = "%System%\barcon.dll,202"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Extensions\{C1F0024B-8278-4999-B7E6-2718426D9FE6}
    • CLSID = "{1FBA04EE-3024-11d2-8F1F-0000F87ABD16}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Extensions\{C1F0024B-8278-4999-B7E6-2718426D9FE6}
    • ClsidExtension = "{D700729C-E1F0-4D92-8C00-DEDEB6A69D88}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Extensions\{C1F0024B-8278-4999-B7E6-2718426D9FE6}
    • Default Visible = "yes"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{D89080BE-5019-4399-96E1-2A0E32AEF599}\TypeLib
    • Version = "1.0"

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 Profile%\Application Data\SetupHlpr.exe
  • %User Profile%\Application Data\movie6.ico
  • %Desktop%\ÃֽſµÈ­ ´Ù¿î¹Þ±â.lnk
  • %System%\barcon.dll
  • %System%\movie6.ico
  • %System%\SetupHlpr.exe
  • %System%\Uninstallbarcon.exe

Step 5

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.
  • %System Root%\Documents and Settings\Administrator

Step 6

Scan your computer with your Trend Micro product to delete files detected as TROJ_AGENT.BCGG. 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 7

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.

  • %User Temp%\nsc1.tmp


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