WORM_ONLINEG.EKA

 Analysis by: Karl Dominguez

 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Propagates via network shares

It may arrive via network shares.

It searches the network for shared networks onto which it attempts to drop copies of itself.

It terminates certain processes or services if found running in the affected system's memory.

This worm uses the Windows Task Scheduler to add a scheduled task that executes the copies it drops.

As of this writing, the said sites are inaccessible.

It steals sensitive information such as user names and passwords related to certain games.

  TECHNICAL DETAILS

File Size:

64,000 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

13 Dec 2010

Payload:

Downloads files, Terminates processes, Steals information

Arrival Details

This worm may arrive via network shares.

Installation

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

  • %Windows%\MsVM_STI.EXE
  • %System%\explorer.exe

(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.. %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.)

It uses the Windows Task Scheduler to add a scheduled task that executes the copies it drops.

It adds the following mutexes to ensure that only one of its copies runs at any one time:

  • afasf

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
MsAudio = %Windows%\MsVM_STI.EXE

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run
MsAudio = %System%\explorer.exe

The scheduled task executes the malware every:

  • everyday at time of first execution

Propagation

This worm searches the network for the following shared networks onto which it attempts to drop copies of itself:

  • admin$

Process Termination

This worm terminates processes or services that contain any of the following strings if found running in the affected system's memory:

  • WinHex
  • eXpLoRer
  • WPEPRO
  • VisualSniffer
  • TSpyMain
  • WinsockExpert
  • OWL_Window
  • URSoft
  • PasswordGuard.exe
  • Iparmor.exe
  • EGHOST.EXE
  • IPARMOR.EXE
  • KAVPFW.EXE
  • KWatchUI.EXE
  • MAILMON.EXE
  • Ravmon.exe
  • ZoneAlarm

Download Routine

This worm accesses the following websites to download files:

  • http://www.{BLOCKED}es.com/sss163/updata.html

It saves the files it downloads using the following names:

  • C:\dfface.exe

As of this writing, the said sites are inaccessible.

Information Theft

This worm steals sensitive information such as user names and passwords related to the following games:

  • Legend of Mir2
  • YB_OnlineClient
  • zhengtu_client

Drop Points

This worm sends the information it gathers to the following email addresses:

  • {BLOCKED}in@163.com

  SOLUTION

Minimum Scan Engine:

8.900

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

Identify and terminate files detected as WORM_ONLINEG.EKA

[ Learn More ]
  1. 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.
  2. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 3

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\policies\Explorer\Run
    • MsAudio = %Windows%\MsVM_STI.EXE
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run
    • MsAudio = %System%\explorer.exe

Step 4

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:\dfface.exe

Step 5

Delete the Scheduled Tasks added by this malware/grayware

[ Learn More ]

Step 6

Scan your computer with your Trend Micro product to delete files detected as WORM_ONLINEG.EKA. 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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