TROJ_PAWXNIC.L

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

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.

It connects to certain websites to send and receive information.

Arrival Details

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

Installation

This Trojan drops and executes the following files:

• %User Temp%\ems-track.jpg
• %User Temp%\emstrack.exe - also detected as TROJ_PAWXNIC.L

(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.)

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Download Routine

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

• https://{BLOCKED}eck.com/se/SoftGetJP.php

It saves the files it downloads using the following names:

• %User Temp%\{random filename}.exe - detected as Ransom_CRYPSHED.SZ

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 connects to the following website to send and receive information:

• https://{BLOCKED}eck.com/se/SoftCheck.php?id={Product ID}&Ver={version number}&name={executable filename}&ilvl={Security Identifier (SID) Level}

NOTES:

This malware checks for the following processes and sleeps indefinitely if found running:

• Python
• bdagent.exe
• bdwtxag.exe

It sleeps indefinitely if the operating system gives an invalid version or if the operating system version is Windows 2000 or earlier.

If it runs in Windows Vista or later versions, it checks on the following registry entries:

• Software\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA

• Software\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin

It gathers the following information and reports it to its servers:

• Product ID
• Malware Version number
• Executable filename of malware
• Security Identifier (SID) Level

It installs its own certificate in the system. This certificate is used for SSL connection to encrypt when downloading malicious binary or reporting to C&C.

It also uses SSLv3 to encrypt its data thus even if GET request method is used, no readable data can be found.