PLATFORM:

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

 OVERALL RISK RATING:
 REPORTED INFECTION:

  • Threat Type:

  • Destructiveness:

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan adds registry entries to enable its automatic execution at every system startup.



  TECHNICAL DETAILS

Tamaño del archivo 2606080 bytes
Fecha de recepción de las muestras iniciales 09 Apr 2010

Installation


This Trojan drops the following files:

    • %Current%\??L



Autostart Technique


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


It drops the following files:

    • C:\autoexec.bat
    • C:\DOCUMENTS AND SETTINGS\ALL USERS\START MENU\Programs\Startup\Wapp.exe



Other System Modifications


This Trojan overwrites the AUTOEXEC.BAT file with the following strings:

    • del c:\windows\downlo~1\*.g??
    • del c:\windows\downlo~1\g*.*
    • @echo off
    • del c:\windows\downlo~1\gb*.*
    • del c:\arquiv~1\GbPlugin\g*.*


  SOLUTION


Step 1


Terminate the malware/grayware/spyware process:

[ Learn More ]
Notes=
  • For Windows 98 and ME users, Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  • If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  • If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.


    • 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.

    • HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\Windows\CURRENTVERSION\Run\Wapp
      • C:\Arquivos de programas\Wapp.exe=REG_SZ


    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.
    • C:\autoexec.bat
    • C:\DOCUMENTS AND SETTINGS\ALL USERS\START MENU\Programs\Startup\Wapp.exe
    • %Current%\??L


    Note: To do a search for the following files, right-click Start then click Search... or Find..., depending on the version of Windows you are running. For each file to be deleted, type its file name in the Named input box. In the Look In drop-down list, select My Computer, then press Enter.
  • Once located, select the file then press SHIFT+DELETE to permanently delete the file.
  • Repeat the said steps for all files listed.


    • Step 4


      Restore AUTOEXEC.BAT files modified by TROJ_BANKER.MKM that contain these strings
      [ Learn More ]
      • del c:\windows\downlo~1\*.g??
      • del c:\windows\downlo~1\g*.*
      • @echo off
      • del c:\windows\downlo~1\gb*.*
      • del c:\arquiv~1\GbPlugin\g*.*


    Step 5


    Restore this file from backup Only Microsoft-related files will be restored. If this malware/grayware/spyware also deleted files related to programs that are not from Microsoft, please reinstall those programs on your computer again.

    • C:\autoexec.bat


    Step 6


    Scan your computer with your Trend Micro product to delete files detected as
    TROJ_BANKER.MKM

    *Note: 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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