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TROJ_FALDAR.A

September 30, 2013
 Analysis by: Jennifer Gumban
 ALIASES:

Trojan.Win32.Cossta.zox (Kaspersky)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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 modifies the Internet Explorer Zone Settings.

  TECHNICAL DETAILS

File Size:

1,561,600 bytes

Memory Resident:

Yes

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.

Web Browser Home Page and Search Page Modification

This Trojan modifies the Internet Explorer Zone Settings.

NOTES:

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

  • %User Profile%\Windows\TPAuto.exe

Drops multiple copies of the following file/component:

  • %User Profile%\PrintHood\{Pseudo Random Alphanumeric}.exe
  • %User Profile%\PrintHood\{Pseudo Random Alphanumeric}.PRI
  • %User Profile%\PrintHood\~{Pseudo Random Alphanumeric}.TMP

Creates the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\Windows\ShellNoRoam\MUICache\%Temp%
{Original File Name}.exe = "Adobe Flash Player Installer"

HKEY_CURRENT_USER\Software\Microsoft\Windows\ShellNoRoam\MUICache\%User Profile%\PrintHood
TPAuto.exe = "TPAuto"

HKEY_CURRENT_USER\Software\Microsoft\Windows\ShellNoRoam\MUICache\%User Profile%\PrintHood
{Original File Name}.exe = "Adobe Flash Player Installer"