TROJ_DOFOIL.JF

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It uses common file icons to trick a user into thinking that the files are legitimate.

It connects to a website to send and receive information.

It deletes itself after execution.

Arrival Details

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

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

• %Application Data%\{random filename}.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.)

It adds the following processes:

• svchost.exe

It uses common file icons to trick a user into thinking that the files are legitimate.

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random characters} = "%Application Data%\{random file name}.exe"

Backdoor Routine

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

• {BLOCKED}.{BLOCKED}.13.19:80
• {BLOCKED}.{BLOCKED}.13.32:80
• {BLOCKED}.{BLOCKED}.149.230:80
• {BLOCKED}.{BLOCKED}.241.131:80
• {BLOCKED}.{BLOCKED}.246.95:80
• {BLOCKED}.{BLOCKED}.234.37:80

Other Details

This Trojan deletes itself after execution.