TROJ_UPATRE.YYSHS

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 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 connects to certain websites to send and receive information. 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:

• %User Temp%\yuJfEw6.exe

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It drops the following files:

• %User Temp%\tmp54BA.txt - contains malware path and file name

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Download Routine

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

• http://{BLOCKED}rie-depannages.com/mandoc/wus1.pdf
• http://{BLOCKED}ouellet.com/mandoc/wus1.pdf

It saves the files it downloads using the following names:

• %User Temp%\{random}.exe

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

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.

Information Theft

This Trojan gathers the following data:

• Computer name
• Operating system version
• Service pack installed

Other Details

This Trojan connects to the following URL(s) to get the affected system's IP address:

• http://checkip.dyndns.org/

It connects to the following website to send and receive information:

• http://{BLOCKED}.{BLOCKED}.131.95:{random port}/1703us11/{computername}/0/{OS Version}-{Service Pack}/0/{random}
• http://{BLOCKED}.{BLOCKED}.131.95:{random port}/1703us11/{computername}/{number}/{number}/{number}/
• http://{BLOCKED}.{BLOCKED}.131.95:{random port}/1703us11/{computername}/{number}/{number}/{number}/{random}

It deletes the initially executed copy of itself