TROJ_DALEXIS.YWC

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. However, as of this writing, the said sites are inaccessible.

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 files:

• %User Temp%\{random filename}.cab ← contains non-malicious .rtf file
• %User Temp%\{malware filename}.rtf

(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 adds the following mutexes to ensure that only one of its copies runs at any one time:

• lfcseouv
• cldizkzg
• ipnkaqdj
• ptqeienx

Download Routine

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

• http://{BLOCKED}roject.org.uk/docs/run.jpg
• http://{BLOCKED}ek.com.sg/icon/run.jpg
• http://{BLOCKED}adata.es/run.jpg
• http://{BLOCKED}lin.eu/stats/run.jpg
• http://{BLOCKED}m.net/run.jpg

It saves the files it downloads using the following names:

• %User Temp%\{random filename}.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.

Other Details

This Trojan connects to the following website to send and receive information:

• http://{BLOCKED}ek.com.sg/icon/1647464660.php
• http://{BLOCKED}ursen.dk/joomla/1647464660.php
• http://{BLOCKED}detectives.es/images/1647464660.php
• http://{BLOCKED}an.com/derutamadre/1647464660.php
• http://{BLOCKED}roject.org.uk/docs/1647464660.php
• http://{BLOCKED}adata.es/1647464660.php
• http://{BLOCKED}lin.eu/stats/1647464660.php
• http://{BLOCKED}m.net/1647464660.php

It opens the following files:

• dropped %User Temp%\{malware filename}.rtf

(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.)

However, as of this writing, the said sites are inaccessible.