VBS_AGENT.BIQU

This Trojan may arrive bundled with malware packages as a malware component. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It does not have any propagation routine.

It does not have any backdoor routine.

Arrival Details

This Trojan may arrive bundled with malware packages as a malware component.

It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
KeyboardMapper

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Download Routine

This Trojan accesses the following websites to download files:

• http://{variable depedending on 'Cache'}/hc/{variable depending on 'Current'}.htm

It saves the files it downloads using the following names:

• {malware path}\{random file name}.tmp.wsf

Other Details

This Trojan executes the downloaded file using the following commands:

• "{variable depending on 'Link'}" "{malware path}\{random file name}.tmp.wsf"

NOTES:

This Trojan deletes the following file after execution:

• {malware path}\{random file name}.tmp.wsf

The following routines may be done by this Trojan depending on its components/registry and how it is used:

• Drop the file{path and file name variable depending on 'Shell'}.sho
• Create the shortcut file {variable file name 1}.lnk
• Execute and delete the created shortcut file
• Return a random sub-folder
• Read the the first value of the operating system version number from the registry key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\CurrentVersion
• Create or delete a registry value in the key HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
• Create a registry value in the key: HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOce
• Delete a registry key or value
• Write an encypted form of the registry key HKEY_CURRENT_USER\SOFTWARE\Microsoft\KeyboardMapper
• Write an encypted form of the registry key HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\{variable}
• Read to obtain data, decrypt, and concatenate variables in the registry key HKEY_CURRENT_USER\SOFTWARE\Microsoft\KeyboardMapper
• Create the registry value temp and delete afterwards

Some of the variables that it may concatenate to the registry and read are the following:

• DefaultValue
• Current
• Cache
• Code
• Slave
• Link
• Master
• Shell

It does not have rootkit capabilities.

It does not exploit any vulnerability.