BackDoor-CZS

This page shows details and results of our analysis on the malware BackDoor-CZS

Download Current DAT: 6618

Threat Detail

Malware Type: Trojan

Malware Sub-type: Remote Access

Discovery Date: 2006-05-12

Next Steps:

Overview
Characteristics
Symptoms
Method of Infection
Removal

Overview

This is a trojan detection. Unlike viruses, trojans do not self-replicate. They are spread manually, often under the premise that they are beneficial or wanted. The most common installation methods involve system or security exploitation, and unsuspecting users manually executing unknown programs. Distribution channels include email, malicious or hacked web pages, Internet Relay Chat (IRC), peer-to-peer networks, etc.

Minimum DAT

4761 (2006-05-12)

Updated DAT

4761 (2006-05-12)

Minimum Engine

5.1.00

File Length

N/A

Description Added

2006-05-12

Description Modified

2006-05-18

Malware Proliferation

Characteristics

Upon execution, the trojan creates the registry keys.

HKEY_CURRENT_USER\LloydSoft
HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Run
"Drivers" = (trojan filepath)

Then it opens the following ports and await commands.

tcp 6969
tcp 40886 :ftp service
random tcp port

Symptoms

Presence of mentioned registry keys
Unexpected ports open

Method of Infection

Trojans do not self-replicate. They are spread manually, often under the premise that the executable is something beneficial. Distribution channels include IRC, peer-to-peer networks, newsgroup postings, etc.

Removal

All Users:
Use current engine and DAT files for detection and removal.

Modifications made to the system Registry and/or INI files for the purposes of hooking system startup, will be successfully removed if cleaning with the recommended engine and DAT combination (or higher).

But in some particular cases, the following steps need to be taken.

Please go to the Microsoft Recovery Console and restore a clean MBR.

On Windows XP:

Insert the Windows XP CD into the CD-ROM drive and restart the computer.
When the "Welcome to Setup" screen appears, press R to start the Recovery Console.
Select the Windows installation that is compromised and provide the administrator password.
Issue 'fixmbr' command to restore the Master Boot Record
Follow onscreen instructions.
Reset and remove the CD from CD-ROM drive.

On Windows Vista and 7:

Insert the Windows CD into the CD-ROM drive and restart the computer.
Click on "Repair Your Computer".
When the System Recovery Options dialog comes up, choose the Command Prompt.
Issue 'bootrec /fixmbr' command to restore the Master Boot Record.
Follow onscreen instructions.
Reset and remove the CD from CD-ROM drive.