Analysis by: Michael Cabel
 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 connects to a website to send and receive information.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system. As of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size: 13,824 bytes
Memory Resident: Yes
Initial Samples Received Date: 17 Jan 2012

Arrival Details

This backdoor may be dropped by the following malware:

  • TROJ_MULDROP.IC

Installation

This backdoor is injected into the following processes running in memory:

  • svchost.exe

Autostart Technique

This backdoor registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Irmon
ImagePath = %System%\svchost.exe -k netsvcs

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Irmon\Parameters
ServiceDll = %System%\iede32.ocx

Backdoor Routine

This backdoor connects to the following websites to send and receive information:

  • www.aviraco.com

Download Routine

This backdoor connects to the following website(s) to download and execute a malicious file:

  • http://www.{BLOCKED}o.com/IElog/TestURL.asp
  • http://www.{BLOCKED}o.com/IElog/Nfile.asp

It saves the files it downloads using the following names:

  • %System\ideo.dll

Trend Micro detects the dowloaded file as:

  • BKDR_CONIP.B

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

As of this writing, the said sites are inaccessible.

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 8.767.01
FIRST VSAPI PATTERN DATE: 17 Jan 2012

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_CONIP.A

    TROJ_MULDROP.IC

Step 3

Remove malware files dropped/downloaded by BKDR_CONIP.A

    BKDR_CONIP.B

Step 4

Restart in Safe Mode

[ Learn More ]

Step 5

Delete this registry key

[ 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_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
    • Irmon

Step 6

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