BKDR_GOOMHTTP.BD

June 18, 2013
 ALIASES:

MultiDropper-SY (McAfee); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Dropper.Generic6.AVSF (AVG)

 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.

  TECHNICAL DETAILS

File Size:

3,244,038 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

04 Jun 2013

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.

Installation

This backdoor creates the following folders:

  • %User Temp%\E_4

(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.)

Dropping Routine

This backdoor drops the following files:

  • %User Temp%\E_4\krnln.fnr
  • %User Temp%\E_4\HtmlView.fne
  • %User Temp%\E_4\EThread.fnr
  • %User Temp%\E_4\internet.fne
  • %User Temp%\E_4\iext.fnr
  • %User Temp%\E_4\iext2.fne
  • %User Temp%\E_4\shell.fne
  • %System Root%\Temp.ini
  • %System Root%\Serverlist.txt

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

Other Details

This backdoor connects to the following possibly malicious URL:

  • http://www.{BLOCKED}f.com/1.txt

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.300

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

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 Temp%\E_4\krnln.fnr
  • %User Temp%\E_4\HtmlView.fne
  • %User Temp%\E_4\EThread.fnr
  • %User Temp%\E_4\internet.fne
  • %User Temp%\E_4\iext.fnr
  • %User Temp%\E_4\iext2.fne
  • %User Temp%\E_4\shell.fne
  • %System Root%\Temp.ini
  • %System Root%\Serverlist.txt

Step 3

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.
  • %User Temp%\E_4

Step 4

Scan your computer with your Trend Micro product to delete files detected as BKDR_GOOMHTTP.BD. 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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