TROJ_INJECTOR.AAA

March 07, 2015
 Modified by: David John Agni
 PLATFORM:

Windows

 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 deletes the initially executed copy of itself.

  TECHNICAL DETAILS

File Size:

221,184 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

05 Feb 2015

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 copies of itself into the affected system:

  • %System Root%\{Random 8 Characters}\{Random 8 Characters}.exe
  • %Application Data%\{Random 8 Characters}.exe

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It creates the following folders:

  • %System Root%\{Random 8 Characters}

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

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
{First 7 Characters of {8 Random Characters}} = "%System Root%\{8 Random Characters}\{8 Random Characters}.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{8 Random Characters} = "%Application Data%\{8 Random Characters}.exe"

It drops the following file(s) in the Windows Startup folder to enable its automatic execution at every system startup:

  • %User Startup%\{Random 8 Characters}.exe

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)

Other System Modifications

This Trojan adds the following registry keys as part of its installation routine:

HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications

HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications\
VCjpeg

HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications\
VCjpeg\Recent File List

HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications\
VCjpeg\Settings

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\SystemRestore
DisableSR = "1"

Other Details

This Trojan connects to the following possibly malicious URL:

  • {BLOCKED}rnalip.com
  • {BLOCKED}ip.com
  • {BLOCKED}properties.com
  • {BLOCKED}bass.org
  • {BLOCKED}i-studenti.it
  • mail.{BLOCKED}arina.biz
  • {BLOCKED}ia.it
  • mail.{BLOCKED}ybuys.com
  • {BLOCKED}oard.com
  • {BLOCKED}dcode.net
  • {BLOCKED}sudha.com
  • {BLOCKED}consultancy.com
  • mail.{BLOCKED}futura.com

It deletes the initially executed copy of itself