Analysis by: Roland Marco Dela Paz
ALIASES:

Backdoor.Trojan (Symantec)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Dropped by other malware

This backdoor may be dropped by other malware.

It runs certain commands that it receives remotely from a malicious user. Doing this puts the affected computer and information found on the computer at greater risk. It connects to a website to send and receive information.

It retrieves specific information from the affected system.

It terminates itself if it detects it is being run in a virtual environment.

  TECHNICAL DETAILS

File Size: 52,736 bytes
File Type: DLL
Memory Resident: Yes
Initial Samples Received Date: 21 May 2012
Payload: Steals information, Compromises system security

Arrival Details

This backdoor may be dropped by other malware.

Installation

This backdoor adds the following mutexes to ensure that only one of its copies runs at any one time:

  • D5X6d8-d83@
  • enddl123.gnway.net:511
  • woyaobaomax6.iego.net:8108

Backdoor Routine

This backdoor opens the following ports:

  • 511
  • 8108

It executes the following command(s) from a remote malicious user:

  • - Launch Denial of Service (DoS) attack
  • - Open a website
  • - Download and execute file(s)
  • - Browse/manipulate files on local drives

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

  • {BLOCKED}aomax6.iego.net
  • {BLOCKED}23.gnway.net

Information Theft

This backdoor retrieves the following information from the affected system:

  • Processor Name
  • CPU Information
  • Operating System Information
  • User Account(s)

Other Details

This backdoor terminates itself if it detects it is being run in a virtual environment.

  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 normal mode and scan your computer with your Trend Micro product for files detected as BKDR_GTFLOOD.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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