TROJ_DLOADR.AUSUMS

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.

As of this writing, the said sites are inaccessible.

It terminates itself if it detects it is being run in a virtual environment.

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 adds the following folders:

• %Application Data%\Microsoft\Windows\{random folder name}

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, and 8.)

It drops a copy of itself in the following folders using different file names:

• %Application Data%\Microsoft\Windows\{random folder name}\{random filename}.exe

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, and 8.)

It drops and executes the following files:

• %User Temp%\allradio_4.27_portable.exe - bundled application

(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, 7, and 8.)

It injects codes into the following process(es):

• explorer.exe

Autostart Technique

This Trojan drops the following shortcut pointing to its copy in the User Startup folder to enable its automatic execution at every system startup:

• %Start Menu%\Programs\Startup\{random filename}.lnk

(Note: %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu on Windows Vista, 7, and 8.)

Download Routine

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

• http://{BLOCKED}r33r.net/
• http://{BLOCKED}iti.net/
• http://{BLOCKED}biberpiror.net/
• http://{BLOCKED}ino.net/
• http://{BLOCKED}xtuy.net/
• http://{BLOCKED}inu.net/
• http://{BLOCKED}nopelletua.top/

It saves the files it downloads using the following names:

• %Application Data%\Microsoft\Windows\{random folder name}\{random filename}

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, and 8.)

As of this writing, the said sites are inaccessible.

Other Details

This Trojan connects to the following URL(s) to check for an Internet connection:

• http://www.msftncsi.com/ncsi.txt

It terminates itself if it detects it is being run in a virtual environment.

It adds the following scheduled tasks:

• Task Name: Opera scheduled Autoupdate 4086469641
  Task to run: %Application Data%\Microsoft\Windows\{random folder name}\{random filename}.exe (malware copy)
  Schedule: Every 10 minutes

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, and 8.)