TROJ_UPATRE.SMB

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

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

It deletes the initially executed copy of itself.

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

Installation

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

• %User Temp%\budha.exe

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

• https://{BLOCKED}dasia.com/logos/astore.exe
• https://{BLOCKED}gfloorrestoration.com/source/logo.exe
• https://{BLOCKED}online.net/images/banner.exe
• https://{BLOCKED}ndjoin.in/wp-content/uploads/2011/11/photography4.exe
• https://{BLOCKED}ngtank.com/images/slade1.exe
• https://{BLOCKED}erforex.com/images/trade.exe

It saves the files it downloads using the following names:

• %User Temp%\kilf.exe - detected as TSPY_ZBOT.VZA
• %Temporary Internet Files%\Content.IE5\{folder name}\logo[{number}].exe - detected as TSPY_ZBOT.VZA
• %Temporary Internet Files%\Content.IE5\{folder name}\astore[{number}].exe - detected as TSPY_ZBOT.VZA

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %Temporary Internet Files% is the Temporary Internet Files folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temporary Internet Files on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Microsoft\Windows\Temporary Internet Files on Windows Vista and 7.)

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

Other Details

This Trojan deletes the initially executed copy of itself

NOTES:

It saves the file it downloads in a path where {folder name} is one of the folders found in %Temporary Internet Files%\Content.IE5 folder with 8 alphanumeric characters.