BKDR_FUCOBHA.AW


 ALIASES:

TrojanSpy:Win32/Fucobha.A(Microsoft), Trojan-Downloader.Win32.Agent.xril(Kaspersky), a variant of Win32/Fucobha.A trojan(Eset), Mal/Proxy-B(Sophos)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware

This backdoor may be dropped by other malware.

It does not have any propagation routine.

It executes commands from a remote malicious user, effectively compromising the affected system.

As of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

EXE, DLL

Memory Resident:

Yes

Initial Samples Received Date:

24 Jan 2013

Payload:

Connects to URLs/IPs, Compromises system security, Downloads files, Collects system information

Arrival Details

This backdoor may be dropped by the following malware:

  • TROJ_MDROPR.AW

Installation

This backdoor drops the following component file(s):

  • %Program Files%\Internet Explorer\sxs.dll - also detected as BKDR_FUCOBHA.AW

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

Propagation

This backdoor does not have any propagation routine.

Backdoor Routine

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

  • Download Files
  • Upload Files
  • Execute Files
  • Perform Remote Shell

It connects to the following URL(s) to send and receive commands from a remote malicious user:

  • www.{BLOCKED}layers.com/jd/upload.aspx?filepath=info&filename{Host Name}_{Local IP Address}.jpg
  • www.{BLOCKED}layers.com/jd/upload.aspx?filepath=ok&filename={Host Name}_{Local IP Address}.jpg

Download Routine

This backdoor accesses the following websites to download files:

  • www.{BLOCKED}ayers.com/jd/order/{Host Name}_{Local IP Address}.jpg

It saves the files it downloads using the following names:

  • %User Temp%\order.dat

(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.)

As of this writing, the said sites are inaccessible.

Information Theft

This backdoor gathers the following data:

  • Host Name
  • Local IP Address
  • Proxy Server (if any)
  • Currently logged on user name
  • System directory
  • OS and System Version
  • List of active processes in the machine

Stolen Information

This backdoor saves the stolen information in the following file:

  • %User Temp%\tmp.dat

(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.)

It sends the gathered information via HTTP POST to the following URL:

  • www.{BLOCKED}layers.com/jd/upload.aspx?filepath=info&filename{Host Name}_{Local IP Address}.jpg
  • www.{BLOCKED}layers.com/jd/upload.aspx?filepath=ok&filename={Host Name}_{Local IP Address}.jpg

NOTES:
This Trojan deletes %User Temp%\tmp.dat after the stolen information is sent.

It does not have rootkit capabilities.

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.688.04

FIRST VSAPI PATTERN DATE:

29 Jan 2013

VSAPI OPR PATTERN File:

9.689.00

VSAPI OPR PATTERN Date:

30 Jan 2013

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

Remove the malware/grayware file that dropped/downloaded BKDR_FUCOBHA.AW

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete this file

[ Learn More ]
There may be some 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%\tmp.dat%User Temp%\order.dat

Step 5

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