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TROJ_FAKEAV.AE

February 20, 2013
 Analysis by: Sabrina Lei Sioting
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • 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:

2,413,056 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

07 Oct 2011

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%\{random filename}.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

It drops the following file(s)/component(s):

  • %Application Data%\{random folder name}\AV Guard Online.ico
  • %Application Data%\ldr.ini
  • %User Profile%\Desktop\AV Guard Online.lnk
  • %User Profile%\Start Menu\Programs\AV Guard Online\AV Guard Online.lnk

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

It creates the following folders:

  • %Application Data%\{random foldername}
  • %Application Data%\{random foldername1}
  • %Application Data%\{random foldername2}
  • %User Profile%\Start Menu\Programs\AV Guard Online

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{random} = "%System%\{random filename}.exe"

Other Details

This Trojan connects to the following URL(s) to check for an Internet connection:

  • http://google.com/

It connects to the following possibly malicious URL:

  • http://{BLOCKED}booklibrarry.com/r.php
  • http://{BLOCKED}ewonline.com/sp.php

It deletes the initially executed copy of itself