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BKDR_LOOKEX.A

November 12, 2012
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This backdoor 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 itself after execution.

  TECHNICAL DETAILS

File Size:

40,960 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

12 Nov 2012

Arrival Details

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

Other System Modifications

This backdoor adds the following registry keys:

HKEY_LOCAL_MACHINE\Software\Microsoft\
Office\Outlook\Addins\
RIMExportEx.Connect

HKEY_CLASSES_ROOT\CLSID\{F03BF566-B3CC-4DF7-B7D2-C9194C8882DF}

HKEY_CLASSES_ROOT\CLSID\{F03BF566-B3CC-4DF7-B7D2-C9194C8882DF}\
Implemented Categories

HKEY_CLASSES_ROOT\CLSID\{F03BF566-B3CC-4DF7-B7D2-C9194C8882DF}\
Implemented Categories\{62C8FE65-4EBB-45E7-B440-6E39B2CDBF29}

HKEY_CLASSES_ROOT\CLSID\{F03BF566-B3CC-4DF7-B7D2-C9194C8882DF}\
InprocServer32

HKEY_CLASSES_ROOT\CLSID\{F03BF566-B3CC-4DF7-B7D2-C9194C8882DF}\
InprocServer32\1.0.4681.30336

HKEY_CLASSES_ROOT\CLSID\{F03BF566-B3CC-4DF7-B7D2-C9194C8882DF}\
ProgId

HKEY_CLASSES_ROOT\RIMExportEx.Connect

HKEY_CLASSES_ROOT\RIMExportEx.Connect\CLSID

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Office\Outlook\Addins\
RIMExportEx.Connect
LoadBehavior = "3"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Office\Outlook\Addins\
RIMExportEx.Connect
Description = "Research in Motion Export Helper"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Office\Outlook\Addins\
RIMExportEx.Connect
FriendlyName = "RIMExportEx"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{F03BF566-B3CC-4DF7-B7D2-C9194C8882DF}\InprocServer32
CodeBase = "%Program Files%\Outlook Express\RIMExportEx.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{F03BF566-B3CC-4DF7-B7D2-C9194C8882DF}\InprocServer32
RuntimeVersion = "v2.0.50727"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{F03BF566-B3CC-4DF7-B7D2-C9194C8882DF}\InprocServer32
Assembly = "RIMExportEx, Version=1.0.4681.30336, Culture=neutral, PublicKeyToken=null"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{F03BF566-B3CC-4DF7-B7D2-C9194C8882DF}\InprocServer32
Class = "RIMExportEx.Connect"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{F03BF566-B3CC-4DF7-B7D2-C9194C8882DF}\InprocServer32
ThreadingModel = "Both"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{F03BF566-B3CC-4DF7-B7D2-C9194C8882DF}\InprocServer32\
1.0.4681.30336
RuntimeVersion = "v2.0.50727"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{F03BF566-B3CC-4DF7-B7D2-C9194C8882DF}\InprocServer32\
1.0.4681.30336
Class = "RIMExportEx.Connect"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{F03BF566-B3CC-4DF7-B7D2-C9194C8882DF}\InprocServer32\
1.0.4681.30336
Assembly = "RIMExportEx, Version=1.0.4681.30336, Culture=neutral, PublicKeyToken=null"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{F03BF566-B3CC-4DF7-B7D2-C9194C8882DF}\InprocServer32\
1.0.4681.30336
CodeBase = "%Program Files%\Outlook Express\RIMExportEx.dll"

Dropping Routine

This backdoor drops the following files:

  • %User Temp%\108578_tmp.tmp
  • %Program Files%\Outlook Express\RIMExportEx.dll

(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.. %Program Files% is the default Program Files folder, usually C:\Program Files.)

Other Details

This backdoor deletes itself after execution.

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.300

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

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\Microsoft\Office\Outlook\Addins
    • RIMExportEx.Connect
  • In HKEY_CLASSES_ROOT\CLSID
    • {F03BF566-B3CC-4DF7-B7D2-C9194C8882DF}
  • In HKEY_CLASSES_ROOT\CLSID\{F03BF566-B3CC-4DF7-B7D2-C9194C8882DF}
    • Implemented Categories
  • In HKEY_CLASSES_ROOT\CLSID\{F03BF566-B3CC-4DF7-B7D2-C9194C8882DF}\Implemented Categories
    • {62C8FE65-4EBB-45E7-B440-6E39B2CDBF29}
  • In HKEY_CLASSES_ROOT\CLSID\{F03BF566-B3CC-4DF7-B7D2-C9194C8882DF}
    • InprocServer32
  • In HKEY_CLASSES_ROOT\CLSID\{F03BF566-B3CC-4DF7-B7D2-C9194C8882DF}\InprocServer32
    • 1.0.4681.30336
  • In HKEY_CLASSES_ROOT\CLSID\{F03BF566-B3CC-4DF7-B7D2-C9194C8882DF}
    • ProgId
  • In HKEY_CLASSES_ROOT
    • RIMExportEx.Connect
  • In HKEY_CLASSES_ROOT\RIMExportEx.Connect
    • CLSID

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\Outlook\Addins\RIMExportEx.Connect
    • LoadBehavior = "3"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\Outlook\Addins\RIMExportEx.Connect
    • Description = "Research in Motion Export Helper"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\Outlook\Addins\RIMExportEx.Connect
    • FriendlyName = "RIMExportEx"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{F03BF566-B3CC-4DF7-B7D2-C9194C8882DF}\InprocServer32
    • CodeBase = "%Program Files%\Outlook Express\RIMExportEx.dll"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{F03BF566-B3CC-4DF7-B7D2-C9194C8882DF}\InprocServer32
    • RuntimeVersion = "v2.0.50727"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{F03BF566-B3CC-4DF7-B7D2-C9194C8882DF}\InprocServer32
    • Assembly = "RIMExportEx, Version=1.0.4681.30336, Culture=neutral, PublicKeyToken=null"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{F03BF566-B3CC-4DF7-B7D2-C9194C8882DF}\InprocServer32
    • Class = "RIMExportEx.Connect"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{F03BF566-B3CC-4DF7-B7D2-C9194C8882DF}\InprocServer32
    • ThreadingModel = "Both"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{F03BF566-B3CC-4DF7-B7D2-C9194C8882DF}\InprocServer32\1.0.4681.30336
    • RuntimeVersion = "v2.0.50727"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{F03BF566-B3CC-4DF7-B7D2-C9194C8882DF}\InprocServer32\1.0.4681.30336
    • Class = "RIMExportEx.Connect"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{F03BF566-B3CC-4DF7-B7D2-C9194C8882DF}\InprocServer32\1.0.4681.30336
    • Assembly = "RIMExportEx, Version=1.0.4681.30336, Culture=neutral, PublicKeyToken=null"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{F03BF566-B3CC-4DF7-B7D2-C9194C8882DF}\InprocServer32\1.0.4681.30336
    • CodeBase = "%Program Files%\Outlook Express\RIMExportEx.dll"

Step 4

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 Temp%\108578_tmp.tmp
  • %Program Files%\Outlook Express\RIMExportEx.dll

Step 5

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