TROJ_DLOADER.BA

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 saves downloaded files into the said created folder. 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 non-malicious file:

• {malware path and file name}.pdf

It creates the following folders:

• %User Temp%\{0EAUJB-61517-A87S-XAD0AF9}

(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.)

It terminates the execution of the copy it initially executed and executes the copy it drops instead.

Autostart Technique

This Trojan drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:

• %User Startup%\adobe_sl.exe

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)

Download Routine

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

• http://{BLOCKED}ads.{BLOCKED}s.com/software.htm

It saves downloaded files into the said created folder.

As of this writing, the said sites are inaccessible.

Other Details

This Trojan opens the following files:

• {malware path and file name}.pdf

It deletes the initially executed copy of itself

NOTES:

It uses an icon for .PDF files.

The PDF file it opens is titled MODSIM World Conference & Expo 2013 to trick users into thinking they are opening a non-malicious .PDF file.