TROJ_BREDLAB.AVM

This trojan uses social engineering methods to lure users into performing certain actions that may, directly or indirectly, cause malicious routines to be performed. Specifically, it makes use of interesting names as file names of the attached file in spammed email messages to lure users into clicking on them.

To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.

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

It executes then deletes itself afterward.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

Arrival Details

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

Installation

This Trojan executes then deletes itself afterward.

Download Routine

This Trojan accesses the following websites to download files:

• http://{BLOCKED}.{BLOCKED}.74.161/mrmun_sgjlgdsjrthrtwg.exe
• http://{BLOCKED}.{BLOCKED}.112.3/bat.exe

It saves the files it downloads using the following names:

• %Application Data%\{random file name}.exe
• %Temp%\_ex-08.exe

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.. %Temp% is the Windows Temporary folder, which is usually C:\Windows\Temp or C:\WINNT\Temp.)

Trend Micro detects the dowloaded file as:

• TROJ_FAKEAV.ZZS
• TROJ_BREDOLAB.WV

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.