TROJ_DLOADR.BUTH

This Trojan 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.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system. As of this writing, the said sites are inaccessible.

It deletes the initially executed copy of itself.

Arrival Details

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

Installation

This Trojan drops the following copies of itself into the affected system and executes them:

• {All Users' Profile}\Application Data\pcdfdata\{malware file name}.exe
• %ProgramData%\pcdfdata\{malware file name}.exe - for Windows Vista and 7 only

(Note: %ProgramData% is a version of the Program Files folder where any user on a multi-user computer can make changes to programs. This is usually C:\ProgramData in Windows Vista and 7, or C:\Program Files on Windows 2000, XP (32-bit), and Server 2003, or C:\Program Files (x86) on Windows XP (64-bit).)

It injects itself into the following processes running in the affected system's memory:

• iexplore.exe

It creates the following folders:

• {All Users' Profile}\Application Data\pcdfdata
• %ProgramData%\pcdfdata - for Windows Vista and 7 only

(Note: %ProgramData% is a version of the Program Files folder where any user on a multi-user computer can make changes to programs. This is usually C:\ProgramData in Windows Vista and 7, or C:\Program Files on Windows 2000, XP (32-bit), and Server 2003, or C:\Program Files (x86) on Windows XP (64-bit).)

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://{BLOCKED}ipadinitiating.org/content/scc

It saves the files it downloads using the following names:

• {All User's Profile}\Application Data\pcdfdata\vl.bin - encrypted FAKEAV file. The decrypted file is detected as TROJ_FAKEAV.BUTH
• %ProgramData%\pcdfdata\vl.bin (Windows Vista and 7 only) - encrypted FAKEAV file. The decrypted file is detected as TROJ_FAKEAV.BUTH

(Note: %ProgramData% is a version of the Program Files folder where any user on a multi-user computer can make changes to programs. This is usually C:\ProgramData in Windows Vista and 7, or C:\Program Files on Windows 2000, XP (32-bit), and Server 2003, or C:\Program Files (x86) on Windows XP (64-bit).)

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

As of this writing, the said sites are inaccessible.

Other Details

This Trojan deletes the initially executed copy of itself

NOTES:

This Trojan downloads and executes an encrypted FAKEAV malware.

It queries the registry HKEY_LOCAL_MACHINE\Software or HKEY_LOCAL_MACHINE\Software\Microsoft for the following anti-malware applications and counts the number of entries present:

• Avira
• ESET
• Kaspersky Lab
• Microsoft Antimalware

It checks if the download link is available by accessing the URL http://{BLOCKED}ipadinitiating.org/api/test. It sends the operating system version and number of antivirus applications installed in the affected system to the following URL:

• http://{BLOCKED}ipadinitiating.org/api/ping?stage={number}&uid={value}&id={number}&subid={number}&os={number}&avf={number of AV registry entries found}

It connects to the URL http://{BLOCKED}ipadinitiating.org/api/ping?stage={number}&uid={random values} to let the remote user know that the download was successful.

It connects to the following URL to let the remote user know the state of initial execution of downloaded file: http://{BLOCKED}ipadinitiating.org/load/?uid={random values}

It connects to the URL http://{BLOCKED}ipadinitiating.org/postload2/?uid={random values} to let the remote user know that the downloaded file is installed successfully.

It connects to the URL http://{BLOCKED}ipadinitiating.org/html/viruslist/?uid={random values} to get updated list of virus information, which is used by the FAKEAV malware.

It does not have rootkit capabilities.

It does not exploit any vulnerability.