Threat Encyclopedia

WORM_BUZUS.BHX

Malware type: Worm

Aliases: No Alias Found

In the wild: Yes

Destructive: No

Language: English

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

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:

Low

Distribution potential:

Medium

Infection Channel 1 : Propagates via removable drives


Description: 

This worm may be downloaded from remote sites by other malware. It may be downloaded unknowingly by a user when visiting malicious Web sites.

It drops copies of itself.

It creates registry keys and entries, some of which enable its automatic execution at every system startup.

It creates a folder in all removable drives. It drops a copy of itself in all removable drives. It drops an AUTORUN.INF file to automatically execute dropped copies when the drives are accessed.

It logs user keystrokes. It does the said routine to steal information. It drops certain files, into which it saves gathered information.

It connects to Web sites.

For additional information about this threat, see:

Description created: Nov. 20, 2009 8:50:29 AM GMT -0800


TECHNICAL DETAILS


File type: PE

Memory resident:  Yes

Size of malware: Varies

Initial samples received on: Nov 20, 2009

Payload 1: Steals information

Details:

Arrival Details

This worm may be downloaded from remote site(s) by other malware.

It may be downloaded unknowingly by a user when visiting malicious Web site(s).

Installation

This worm drops the following copy of itself:

  • %System%\jrshed.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.)

It drops the following component files, which are also detected by Trend Micro as WORM_BUZUS.BHX:

  • %System%\jhm.exe
  • %System%\jvmi.exe

Autostart Techniques

This worm creates the following registry entry to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Run
SunJavaUpdateSched12 = "%System%\jrshed.exe"

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Run
Windows Audio Services = "%System%\jvmi.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\
Installed Components\{2PP4IQN2-FM46-XFIE-1FI5-U58FEU6C0DCG}
StubPath = "%System%\jvmi.exe"

Other System Modifications

This worm creates the following registry keys/entries:

HKEY_CURRENT_USER\Software\Javasoftware12

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Explorer
qele2 = "06"
qetr2 = "26"

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\
Policies\Explorer\Run
Windows Audio Services = "%System%\jvmi.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Javasoftware12

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\
policies\system
EnableLUA = "0"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ERSvc
DeleteFlag = "1"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ERSvc
FailureActions = "{hex values}"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\
SharedAccess\Parameters\FirewallPolicy\StandardProfile\
AuthorizedApplications\List
%System%\jrshed.exe = "%System%\jrshed.exe:*:Enabled:Explorer"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\wscsvc
DeleteFlag = "1"
FailureActions = "{hex values}"

It modifies the following registry entry as part of its installation routine:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\
CurrentVersion\SystemRestore
DisableSR = "1"

(Note: The default value data for the said registry entry is 0.)

Propagation via Removable Drives

This worm creates the following folder in all removable drives:

  • RECYCLER

It drops the following copy of itself in all removable drives:

  • redmond.exe

It drops an AUTORUN.INF file to automatically execute dropped copies when the drives are accessed. The said .INF file contains the following strings:

[autorun]
open=RECYCLER\S-1-6-21-2434476521-1645641927-702000330-1542\redmond.exe
icon=%SystemRoot%\system32\SHELL32.dll,4
action=Open folder to view files
shell\open=Open
shell\open\command=RECYCLER\S-1-6-21-2434476521-1645641927-702000330-1542\redmond.exe
shell\open\default=1

Information Theft

This worm logs user keystrokes. It does the said routine to steal information.

It drops the following file into which it saves gathered information:

  • %Windows%\javaodbc.ini

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

Download Routine

This worm connects to the following Web site(s):

  • http://{BLOCKED}myip.com/automation/n09230945.asp

Affected Platforms

This worm runs on Windows 98, ME, NT, 2000, XP, and Server 2003.


Analysis By: Erika Mendoza


SOLUTION


Minimum scan engine version needed: 8.900


Important note: The "Minimum scan engine" refers to the earliest Trend Micro scan engine version guaranteed to detect this threat. However, Trend Micro strongly recommends that you update to the latest version in order to get comprehensive protection. Download the latest scan engine here.

Solution:

For Windows ME and XP users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

 Step 1: Identify and terminate files detected as WORM_BUZUS.BHX  [learn how]

*Note:

  1. 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.
  2. 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.
  3. 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 how]

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
    • SunJavaUpdateSched12 = "%System%\jrshed.exe"
    • Windows Audio Services = "%System%\jvmi.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
    Active Setup\Installed Components\
    {2PP4IQN2-FM46-XFIE-1FI5-U58FEU6C0DCG}
    • StubPath = "%System%\jvmi.exe"

 Step 3:  Delete this registry value  [learn how]

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\Explorer
    • qele2 = "06"
    • qetr2 = "26"
  • In HKEY_CURRENT_USER\Software\Microsoft\
    Windows\CurrentVersion\Policies\
    Explorer\Run
    • Windows Audio Services = "%system%\jvmi.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
    Windows\CurrentVersion\policies\
    system
    • EnableLUA = "0"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
    Services\ERSvc
    • DeleteFlag = "1"
    • FailureActions = "{hex values}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
    Services\SharedAccess\Parameters\
    FirewallPolicy\StandardProfile\AuthorizedApplications\
    List
    • %system%\jrshed.exe = "%system%\jrshed.exe:*:Enabled:Explorer"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
    Services\wscsvc
    • DeleteFlag = "1"
    • FailureActions = "{hex values}"

 Step 4:  Delete this registry key  [learn how]

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
    • Javasoftware12
  • In HKEY_LOCAL_MACHINE\SOFTWARE
    • Javasoftware12

 Step 5:  Restore this modified registry value  [learn how]

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 NT\CurrentVersion\SystemRestore
    • From: DisableSR = "1"
      To: DisableSR = "0"

 Step 6: Search and delete these files  [learn how]

*Note: 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.

  • %System%\jrshed.exe

 Step 7: Search and delete AUTORUN.INF files created by WORM_BUZUS.BHX that contain these strings  [learn how]

    [autorun]
    open=RECYCLER\S-1-6-21-2434476521-1645641927-702000330-1542\redmond.exe
    icon=%SystemRoot%\system32\SHELL32.dll,4
    action=Open folder to view files
    shell\open=Open
    shell\open\command=RECYCLER\S-1-6-21-2434476521-1645641927-702000330-1542\redmond.exe
    shell\open\default=1

 Step 8: Scan your computer with your Trend Micro product to delete files detected as WORM_BUZUS.BHX  

*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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