Analysis by: Cris Nowell Pantanilla
 PLATFORM:

Windows 98, ME, NT, 2000, XP, Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

However, as of this writing, the said sites are inaccessible.

It accesses websites to download files. This action allows this malware to possibly add other malware on the affected computer. It executes downloaded files whose malicious routines are exhibited by the affected system.

It modifies the affected system's HOSTS files. This prevents users from accessing certain websites.

  TECHNICAL DETAILS

File Size: 169,260 bytes
File Type: EXE
Memory Resident: Yes

Arrival Details

However, as of this writing, the said sites are inaccessible.

Installation

This Trojan drops the following copies of itself into the affected system:

  • %System%\C0NIMEO.EXE

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\
CurrentVersion\Run
360Safetask = %System%\C0NIMEO.EXE

Download Routine

This Trojan accesses websites to download the following files:

  • http://{BLOCKED}.987255.com/image/ym.jpg

It executes downloaded files :

    whose malicious routines are exhibited by the affected system.

    HOSTS File Modification

    This Trojan modifies the affected system's HOSTS files to prevent a user from accessing the following websites:

    • www.{BLOCKED}tclean.org.cn
    • www.{BLOCKED}3fang.com
    • www.{BLOCKED}tclean.cn
    • www.{BLOCKED}ngdun.net
    • www.{BLOCKED}8tgws.cn
    • www.{BLOCKED}ng6.com.cn
    • www.{BLOCKED}tclean.com.cn
    • www.{BLOCKED}bi.cn
    • www.{BLOCKED}ydj.com
    • www.{BLOCKED}tclean.org.cn

      SOLUTION

    Minimum Scan Engine: 8.900
    VSAPI OPR PATTERN File: 6.212.01
    VSAPI OPR PATTERN Date: 21 Jun 2009

    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

    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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
      • 360Safetask = %System%\C0NIMEO.EXE

    Step 3

    Remove these strings added by the malware/grayware/spyware in the HOSTS file

    [ Learn More ]
    • www.{BLOCKED}tclean.org.cn
    • www.{BLOCKED}3fang.com
    • www.{BLOCKED}tclean.cn
    • www.{BLOCKED}ngdun.net
    • www.{BLOCKED}8tgws.cn
    • www.{BLOCKED}ng6.com.cn
    • www.{BLOCKED}tclean.com.cn
    • www.{BLOCKED}bi.cn
    • www.{BLOCKED}ydj.com
    • www.{BLOCKED}tclean.org.cn

    Step 4

    Scan your computer with your Trend Micro product to delete files detected as TROJ_PACKED.DHI. 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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