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TROJ_SCAR.AEE

October 12, 2012
 ALIASES:

TrojanDownloader:Win32/Banload.AHA (Microsoft); Generic Downloader.x!ggx (McAfee); Downloader (Symantec); PAK:UPX, Trojan.Win32.Scar.fvjv (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Generic.7161809 (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:

191,488 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

19 Apr 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 drops the following copies of itself into the affected system:

  • %User Profile%\Application Data\SamSungGalyxSII.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
RDSound = "%User Profile%\Application Data\SamSungGalyxSII.exe"

It 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\{7EDA5F65-3547-4CCE-B9D0-96FFC105AC8B}

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{921F7C9E-E24A-4A9A-847C-1708FBE274E7}

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CLASSES_ROOT\CLSID\{7EDA5F65-3547-4CCE-B9D0-96FFC105AC8B}

HKEY_CLASSES_ROOT\CLSID\{7EDA5F65-3547-4CCE-B9D0-96FFC105AC8B}\
InprocServer32

HKEY_CLASSES_ROOT\javaLixPortableLLLix.Conex

HKEY_CLASSES_ROOT\javaLixPortableLLLix.Conex\Clsid

HKEY_CLASSES_ROOT\CLSID\{7EDA5F65-3547-4CCE-B9D0-96FFC105AC8B}\
ProgID

HKEY_CLASSES_ROOT\CLSID\{921F7C9E-E24A-4A9A-847C-1708FBE274E7}

HKEY_CLASSES_ROOT\CLSID\{921F7C9E-E24A-4A9A-847C-1708FBE274E7}\
InprocServer32

HKEY_CLASSES_ROOT\JavaSanPortableSAM.JavaPortableMix.config

HKEY_CLASSES_ROOT\JavaSanPortableSAM.JavaPortableMix.config\Clsid

HKEY_CLASSES_ROOT\CLSID\{921F7C9E-E24A-4A9A-847C-1708FBE274E7}\
ProgID

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{7EDA5F65-3547-4CCE-B9D0-96FFC105AC8B}\InprocServer32
ThreadingModel = "Apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{921F7C9E-E24A-4A9A-847C-1708FBE274E7}\InprocServer32
ThreadingModel = "Apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
system
EnableLUA = "0"

Dropping Routine

This Trojan drops the following files:

  • %User Profile%\Application Data\Nreg.bat
  • %User Profile%\Application Data\NUac.bat
  • %User Profile%\Application Data\javaLixPortableLLLix.dll
  • %User Profile%\Application Data\JavaSanPortableSAM.dll
  • %User Profile%\Application Data\EyewearAVV.txt

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://www.{BLOCKED}eb.com.arnew/templates/beez/html/com_user/user/defaut/acesso.php
  • http://{BLOCKED}esilicone.com/images/metodo_lix.swf
  • http://{BLOCKED}esilicone.com/images/metodo_san.swf

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.200

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Restart in Safe Mode

[ Learn More ]

Step 3

Close all opened browser windows

Step 4

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_CLASSES_ROOT\CLSID
    • {7EDA5F65-3547-4CCE-B9D0-96FFC105AC8B}
  • In HKEY_CLASSES_ROOT\CLSID\{7EDA5F65-3547-4CCE-B9D0-96FFC105AC8B}
    • InprocServer32
  • In HKEY_CLASSES_ROOT
    • javaLixPortableLLLix.Conex
  • In HKEY_CLASSES_ROOT\javaLixPortableLLLix.Conex
    • Clsid
  • In HKEY_CLASSES_ROOT\CLSID\{7EDA5F65-3547-4CCE-B9D0-96FFC105AC8B}
    • ProgID
  • In HKEY_CLASSES_ROOT\CLSID
    • {921F7C9E-E24A-4A9A-847C-1708FBE274E7}
  • In HKEY_CLASSES_ROOT\CLSID\{921F7C9E-E24A-4A9A-847C-1708FBE274E7}
    • InprocServer32
  • In HKEY_CLASSES_ROOT
    • JavaSanPortableSAM.JavaPortableMix.config
  • In HKEY_CLASSES_ROOT\JavaSanPortableSAM.JavaPortableMix.config
    • Clsid
  • In HKEY_CLASSES_ROOT\CLSID\{921F7C9E-E24A-4A9A-847C-1708FBE274E7}
    • ProgID

Step 5

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\Microsoft\Windows\CurrentVersion\Run
    • RDSound = "%User Profile%\Application Data\SamSungGalyxSII.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{7EDA5F65-3547-4CCE-B9D0-96FFC105AC8B}\InprocServer32
    • ThreadingModel = "Apartment"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{921F7C9E-E24A-4A9A-847C-1708FBE274E7}\InprocServer32
    • ThreadingModel = "Apartment"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system
    • EnableLUA = "0"

Step 6

Search and delete these files

[ Learn More ]
There may be some component 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 Profile%\Application Data\Nreg.bat
  • %User Profile%\Application Data\NUac.bat
  • %User Profile%\Application Data\javaLixPortableLLLix.dll
  • %User Profile%\Application Data\JavaSanPortableSAM.dll
  • %User Profile%\Application Data\EyewearAVV.txt

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_SCAR.AEE. 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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