BKDR_INJECT.KFR

October 09, 2012
 Analysis by: Cris Nowell Pantanilla
 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

Infection Channel:

Dropped by other malware

This backdoor may be dropped by other malware.

It executes commands from a remote malicious user, effectively compromising the affected system. It connects to a website to send and receive information.

It deletes the initially executed copy of itself.

  TECHNICAL DETAILS

File Size:

69,632 bytes

File Type:

EXE, DLL

Memory Resident:

Yes

Initial Samples Received Date:

12 Apr 2012

Payload:

Compromises system security, Connects to URLs/IPs

Arrival Details

This backdoor may be dropped by the following malware:

Installation

This backdoor drops the following non-malicious files:

  • %User Temp%\conime.inf
  • %User Startup%\Updata.lnk

(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.. %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)

It drops the following copies of itself into the affected system:

  • %User Temp%\conime.exe

(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.)

Its DLL component is injected to the following process(es):

  • IEXPLORE.EXE

Backdoor Routine

This backdoor executes the following commands from a remote malicious user:

  • Create,Search,Delete and Read files
  • Download/Upload Files
  • Execute/Terminate Process
  • IM IDs and password
  • List of drives and files
  • List running processes
  • Screenshot of the affected system
  • Shell Command
  • User account names and passwords

It connects to the following websites to send and receive information:

  • {BLOCKED}.{BLOCKED}.197.30
  • {BLOCKED}.{BLOCKED}.77.98

Dropping Routine

This backdoor drops the following files:

  • %User Temp%\conime.dll - BKDR_INJECT.KFR

(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.)

Other Details

This backdoor deletes the initially executed copy of itself

  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

Remove malware files dropped/downloaded by BKDR_INJECT.KFR

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete this file

[ 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%\conime.inf
%User Startup%\Updata.lnk

Step 5

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