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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.

Aliases

• BackDoor.Optix.11 (Dialogue Science)

• Backdoor.Optix.Pro.11 (AVP)

Characteristics

This Trojan in multicomponent in nature, consisting of server, client and configuration (server editor) components. When the server component is executed on the victim machine, it enables the hacker running the client component to access the machine.

Due to multiple versions, and the configurable nature of the server component, the following description is specific to a sample AVERT have received from the field. Exact filenames, Registry key names, port numbers etc. will vary between cases.

The indicated minimum DATs required for detection are for early variants of this Trojan. Latter variants require more recent DATs.

When the server component is executed on the victim machine:

• a fake error messagebox is displayed
  
• it copies itself to the Windows System directory (for example: DLLDAT32.EXE, 334,758 bytes)
• the following Regstry keys are added to start the server at system startup:
  
  HKLM\Software\Microsoft\Windows\CurrentVersion\Run
  "DLLDAT32" = c:\windows\system\dlldat32.exe
  
  HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices
  "DLLDAT32" = c:\windows\system\dlldat32.exe
  
• additions are also made to the SYSTEM.INI and WIN.INI files in order to start the server at system startup.
• it opens a port on the victim machine (for example, port 13371)
• certain processes (personal firewall products, AV products etc) are shutdown
• it sends a notification (using a public script library) via port 80 to the author. This message all the information necessary for the hacker to connect to the server using the client component of this Trojan:
  1. machine IP address
  2. victim user name
  3. port number opened
  4. server password
  5. server version

Once connected to a victim machine, the hacker can perform many functions using the client component. These include:

• Process Manager (list, kill running processes)
• File Manager (list, upload, download, delete)
• Registry Manager (browse Registry, add, edit, delete keys)
• Windows Manager (browse, close, max/minimise, rename)
• Extract passwords from machine (Windows and AIM)
• Restart server
• Capture Screen
• Lots of jokes can also be played on victim (hiding icons/clock/menus, sounding speaker, activating screen-saver, spoofing BSOD etc).

The server, client and configuration components of this Trojan are detected as BackDoor-ACH. The Registry and ini file hooks employed by the server are removed upon cleaning.

Symptoms

Existence of symptoms matching the above described Registry keys, files and open ports.

NB: The server component attempts to shuts down various processes (AV scanners, firewall products etc.). This is another symptom to watch for.

Method of Infection

The victim machine is rendered vulnerable when the client component is executed.

Removal

AVERT recommends to always use latest DATs and engine. This threat will be cleaned if you have this combination.

Additional Windows ME/XP removal considerations

Variants

Variants

N/A

All Information

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.

Aliases

• BackDoor.Optix.11 (Dialogue Science)

• Backdoor.Optix.Pro.11 (AVP)

Characteristics

Characteristics -

This Trojan in multicomponent in nature, consisting of server, client and configuration (server editor) components. When the server component is executed on the victim machine, it enables the hacker running the client component to access the machine.

Due to multiple versions, and the configurable nature of the server component, the following description is specific to a sample AVERT have received from the field. Exact filenames, Registry key names, port numbers etc. will vary between cases.

The indicated minimum DATs required for detection are for early variants of this Trojan. Latter variants require more recent DATs.

When the server component is executed on the victim machine:

• a fake error messagebox is displayed
  
• it copies itself to the Windows System directory (for example: DLLDAT32.EXE, 334,758 bytes)
• the following Regstry keys are added to start the server at system startup:
  
  HKLM\Software\Microsoft\Windows\CurrentVersion\Run
  "DLLDAT32" = c:\windows\system\dlldat32.exe
  
  HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices
  "DLLDAT32" = c:\windows\system\dlldat32.exe
  
• additions are also made to the SYSTEM.INI and WIN.INI files in order to start the server at system startup.
• it opens a port on the victim machine (for example, port 13371)
• certain processes (personal firewall products, AV products etc) are shutdown
• it sends a notification (using a public script library) via port 80 to the author. This message all the information necessary for the hacker to connect to the server using the client component of this Trojan:
  1. machine IP address
  2. victim user name
  3. port number opened
  4. server password
  5. server version

Once connected to a victim machine, the hacker can perform many functions using the client component. These include:

• Process Manager (list, kill running processes)
• File Manager (list, upload, download, delete)
• Registry Manager (browse Registry, add, edit, delete keys)
• Windows Manager (browse, close, max/minimise, rename)
• Extract passwords from machine (Windows and AIM)
• Restart server
• Capture Screen
• Lots of jokes can also be played on victim (hiding icons/clock/menus, sounding speaker, activating screen-saver, spoofing BSOD etc).

The server, client and configuration components of this Trojan are detected as BackDoor-ACH. The Registry and ini file hooks employed by the server are removed upon cleaning.

Symptoms

Symptoms -

Existence of symptoms matching the above described Registry keys, files and open ports.

NB: The server component attempts to shuts down various processes (AV scanners, firewall products etc.). This is another symptom to watch for.

Method of Infection

Method of Infection -

The victim machine is rendered vulnerable when the client component is executed.

Removal -

Removal -

AVERT recommends to always use latest DATs and engine. This threat will be cleaned if you have this combination.

Additional Windows ME/XP removal considerations

Variants

Variants -

N/A