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TROJ_DLOADER.CJP

October 08, 2012
 Analysis by: Christopher Daniel So
 PLATFORM:

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

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW


This Trojan executes downloaded files whose malicious routines are exhibited by the affected system.

  TECHNICAL DETAILS

File Size:

81,920 bytes

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

05 Jul 2009

Autostart Technique

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

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
spro = "%ProgramFiles%\SPro\sproinit.exe"

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
barsc = "%ProgramFiles%\BarSC\barsc.exe"

Download Routine

This Trojan accesses the following websites to download files:

  • http://up1.sidepro.co.kr/spro.exe
  • http://up1.sidepro.co.kr/sproinit.exe
  • http://up1.sidepro.co.kr/Ver_MainDLL.txt
  • http://update1.barsearch.co.kr/Side2/App/barsc.exe
  • http://update1.barsearch.co.kr/Side2/App/barscinit.exe
  • http://update1.barsearch.co.kr/Side2/App/Ver_MainDLL.txt

It saves the files it downloads using the following names:

  • %ProgramFiles%\SPro\spro.exe
  • %ProgramFiles%\SPro\sproinit.exe
  • %ProgramFiles%\SPro\Ver_MainDLL.txt
  • %ProgramFiles%\BarSC\barsc.exe
  • %ProgramFiles%\BarSC\barscinit.exe
  • %ProgramFiles%\BarSC\Ver_MainDLL.txt

It executes downloaded files :

    whose malicious routines are exhibited by the affected system.

      SOLUTION

    Minimum Scan Engine:

    8.900

    VSAPI PATTERN File:

    6.246.08

    VSAPI PATTERN Date:

    05 Jul 2009

    VSAPI PATTERN Date:

    7/5/2009 12:00:00 AM

    Step 1

    Scan your computer with your Trend Micro product and note files detected as TROJ_DLOADER.CJP

    Step 2

    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_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
      • spro
    • In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
      • barsc

    Step 3

    Search and delete these files

    [ Learn More ]
    There may be some component 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. %ProgramFiles%\SPro\spro.exe
    %ProgramFiles%\SPro\sproinit.exe
    %ProgramFiles%\SPro\Ver_MainDLL.txt
    %ProgramFiles%\BarSC\barsc.exe
    %ProgramFiles%\BarSC\barscinit.exe
    %ProgramFiles%\BarSC\Ver_MainDLL.txt

    Step 4

    Scan your computer with your Trend Micro product to delete files detected as TROJ_DLOADER.CJP. 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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