Analysis by: Rika Joi Gregorio
 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: 20,496,384 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 19 Nov 2012
Payload: Compromises system security

Arrival Details

This backdoor may be dropped by the following malware:

  • TROJ_ARTIEF.DR

Autostart Technique

This backdoor adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
conime.exe = "%Windows%\Tasks\conime.exe"

Propagation

This backdoor does not have any propagation routine.

Backdoor Routine

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

  • Execute files
  • Perform remote shell
  • Sleep for a specified amount of time
  • Download files
  • Delete self

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

  • http://{BLOCKED}9.{BLOCKED}ser.com/rc/news1.asp?id=flag:1119%20host:{Host Name}%20IP:{IP Address}%20OS:{OS Version}%20vm:{special character}%20proxy:{special character}

Download Routine

This backdoor accesses the following websites to download files:

  • http://{BLOCKED}9.{BLOCKED}ser.com/a.asp?id={random value}
  • http://{BLOCKED}9.{BLOCKED}w.us/a.asp?id={random value}

It saves the files it downloads using the following names:

  • %User Temp%\temps.ini

(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
  • OS Version
  • Proxy Server IP and Port

NOTES:

It does not have rootkit capabilities.

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 9.536.05
FIRST VSAPI PATTERN DATE: 19 Nov 2012
VSAPI OPR PATTERN File: 9.537.00
VSAPI OPR PATTERN Date: 20 Nov 2012

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_PROXY.DR

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • conime.exe = "%Windows%\Tasks\conime.exe"

Step 5

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%\temps.ini

Step 6

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