TROJ_FAKEAV.BXA

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 displays fake alerts that warn users of infection. It also displays fake scanning results of the affected system. It then asks for users to purchase it once scanning is completed. If users decide to purchase the rogue product, users are directed to a certain website asking for sensitive information, such as credit card numbers.

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 files:

• %System Root%\Documents and Settings\All Users\Application Data\{random}\{random} - encypted component
• %User Desktop%\Smart Fortress 2012.lnk - shortcut file
• %Start Menu%\Programs\Smart Fortress 2012\Smart Fortress 2012.lnk - shortcut file

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Profiles\{user name}\Start Menu on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu on Windows NT and C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003.)

It drops the following copies of itself into the affected system:

• %System Root%\Documents and Settings\All Users\Application Data\{random}\{random}.exe

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It creates the following folders:

• %System Root%\Documents and Settings\All Users\Application Data\{random}
• %Start Menu%\Programs\Smart Fortress 2012

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Profiles\{user name}\Start Menu on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu on Windows NT and C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003.)

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CLASSES_ROOT\%s

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
Smart Fortress 2012

HKEY_CLASSES_ROOT\{first 5 characters of malware filename}

It adds the following registry entries:

HKEY_CLASSES_ROOT\{first 5 characters of malware filename}\shell\
open\command
@ = "%System Root%\Documents and Settings\All Users\Application Data\{random}\{random}.exe" -s "%1" %*

It modifies the following registry entries:

HKEY_CLASSES_ROOT\.exe
@ = "{first 5 characters of malware filename}"

(Note: The default value data of the said registry entry is exefile.)

Rogue Antivirus Routine

This Trojan displays fake alerts that warn users of infection. It also displays fake scanning results of the affected system. It then asks for users to purchase it once scanning is completed. If users decide to purchase the rogue product, users are directed to a certain website asking for sensitive information, such as credit card numbers.