Analysis by: Karl Dominguez
 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

This backdoor may be dropped by other malware.

It does not have any propagation routine.

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 gathers certain information on the affected computer.

  TECHNICAL DETAILS

Ports: TCP Port 443
File Size: 19,968 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 28 Jul 2011

Arrival Details

This backdoor may be dropped by the following malware:

  • TROJ_PIDIEF.XEA

Propagation

This backdoor does not have any propagation routine.

Backdoor Routine

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

  • Download and execute other files
  • Execute arbitary CMD shell commands

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

  • {BLOCKED}24.195

Information Theft

This backdoor gathers the following information on the affected computer:

  • Computer Name
  • User Name
  • Operating System Version
  • Proxy Server

NOTES:

It does not have rootkit capabilities.

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 8.316.12
FIRST VSAPI PATTERN DATE: 29 Jul 2011
VSAPI OPR PATTERN File: 8.317.00
VSAPI OPR PATTERN Date: 29 Jul 2011

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 the malware/grayware file that dropped/downloaded BKDR_ETUMBOT.O

Step 3

Identify and terminate files detected as BKDR_ETUMBOT.O

[ Learn More ]
  1. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  2. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 4

Scan your computer with your Trend Micro product to delete files detected as BKDR_ETUMBOT.O. 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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