BKDR_ALINA.NG

This backdoor is also known as BlackPOS.

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 runs certain commands that it receives remotely from a malicious user. Doing this puts the affected computer and information found on the computer at greater risk.

It deletes the initially executed copy of itself.

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 the following copies of itself into the affected system and executes them:

• %User Profile%\Application Data\{file name}.exe

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

HKEY_CURRENT_USER\Software\Microsoft\
CurrentVersion\Run
{file name} = "%User Profile%\Application Data\{file name}.exe"

Backdoor Routine

This backdoor executes the following command(s) from a remote malicious user:

• Update itself
• Set intervals of checking for update and download link
• Set intervals of sending of logs and log level

It connects to the following URL(s) to send and receive commands from a remote malicious user:

• http://{BLOCKED}ns.com/forum/login.php
• http://{BLOCKED}zus.com/forum/login.php

It posts the following information to its command and control (C&C) server:

• act = Action type ([d]ownload, [l]og or [c]ard data)
• b = Volume serial number
• c = Computer Name
• v = Malware build version
• p = Malware Installation path
• ldata = log data
• cdata = card (track) data

Other Details

This backdoor deletes the initially executed copy of itself

NOTES:

Where {file name} can be any of the following:

• dwm
• win-firewall
• adobeflash
• desktop
• jucheck
• jusched
• java

It scans the memory of all running processes to retrieve card track data.

It skips to scan the following processes:

• explorer.exe
• chrome.exe
• firefox.exe
• iexplore.exe
• svchost.exe
• smss.exe
• crss.exe
• wininit.exe
• steam.exe
• devenv.exe
• thunderbird.exe
• skype.exe
• pidgin.exe

It uses the following regular expressions as pattern for scanning track data: