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WORM_GENOME.DD

October 08, 2012
 Analysis by: jasperm
 ALIASES:

Symantec: Downloader ; Microsoft : TrojanDownloader:Win32/VB.NO ; Kaspersky: Trojan-Downloader.Win32.Genome.azjy

 PLATFORM:

Windows 2000, Windows XP, Windows 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 removable drives, Propagates via instant messaging applications


It sends messages that contain links to sites hosting remote copies of itself using the instant messaging (IM) applications Google Talk, Yahoo! Messenger, ICQ, Live Messenger, PalTalk, Skype and XFire.

It also drops a copy of itself in the folder created in removable drives using the file names of folders found in the drives. It also creates a .LNK file using the file names of folders found in the removable drives, which is a shortcut file that redirects to its dropped copy.

This worm arrives via removable drives. It may be dropped by other malware. It may be unknowingly downloaded by a user while visiting malicious websites.

It modifies registry entries to disable the Windows Firewall settings. This action allows this malware to perform its routines without being deteted by the Windows Firewall.

It drops copies of itself into all the removable drives connected to an affected system.

It connects to a website to send and receive information.

  TECHNICAL DETAILS

File Size:

86,016 bytes

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

23 Dec 2010

Payload:

Compromises system security, Connects to URLs/Ips

Arrival Details

This worm arrives via removable drives.

It may be dropped by other malware.

It may be unknowingly downloaded by a user while visiting malicious websites.

Installation

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

  • %Application Data%\HEX-5823-6893-6818\jutched.exe

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Java Update Manager = %Application Data%\HEX-5823-6893-6818\jutched.exe

Other System Modifications

This worm modifies the following registry entries to disable the Windows Firewall settings:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
{malware path and file name} = {malware path and file name}:*:Enabled:Java Update Manager

Propagation

This worm creates the following folders in all removable drives:

  • 8585485

It drops copies of itself into all the removable drives connected to an affected system.

It sends messages that contain links to sites hosting remote copies of itself using the following instant-messaging (IM) applications:

  • Google Talk
  • Yahoo! Messenger
  • ICQ
  • Live Messenger
  • PalTalk
  • Skype
  • XFire

Backdoor Routine

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

  • {BLOCKED}ution.nicaze.net

Other Details

This worm does the following:

  • Drops a copy of itself in the created folder in removable drives using the file names of folders found in the drives. It also creates a .LNK file using the file names of folders found in the removable drives, which is a shortcut file that redirects to its dropped copy.

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI PATTERN File:

under testing

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_GENOME.DD

[ 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\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • {malware path and file name} = {malware path and file name}:*:Enabled:Java Update Manager
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • Java Update Manager = %Application Data%\HEX-5823-6893-6818\jutched.exe

Step 4

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.  {Removable drive}:\8585485

Step 5

Search and delete this file

[ 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.
 {Removable drive}:\{Name of folder found in the drive}.LNK

Step 6

Scan your computer with your Trend Micro product to delete files detected as WORM_GENOME.DD. 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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