BKDR_ANDROM.A

This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It connects to a website to send and receive information.

Arrival Details

This backdoor 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 backdoor drops a copy of itself in the following folders using different file names:

• %System Root%\Documents and Settings\All Users\svchost.exe
• %System Root%\Documents and Settings\All Users\Local Settings\Temp\ms{random characters}.{extension name}

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

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
SunJavaUpdateSched = "%System Root%\Documents and Settings\All Users\svchost.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
{random number} = "%System Root%\Documents and Settings\All Users\Local Settings\Temp\ms{random characters}.{extension name}"

Other System Modifications

This backdoor creates the following registry entry(ies) to bypass Windows Firewall:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
{Malware Path and Filename} = "{Malware Path and Filename}:*:Enabled:FactsManager"

Backdoor Routine

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

• http://{BLOCKED}d.pl/image.php
• http://{BLOCKED}a.pl/image.php
• http://{BLOCKED}e.pl/image.php
• http://{BLOCKED}m.ru/image.php
• http://{BLOCKED}ge.com/image.php
• http://{BLOCKED}m.ru/image.php

Download Routine

This backdoor connects to the following website(s) to download and execute a malicious file:

• http://www.{BLOCKED}t.com/menu/images/view.exe

Other Details

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

• http://www.update.microsoft.com

NOTES:

The {extension name} of the dropped copy is any of the following:

• .BAT
• .CMD
• .COM
• .EXE
• .PIF
• .SCR