BKDR_SDBOT.OJ

Malware type: Backdoor

Aliases: Backdoor/SdBot.Server, IRC/Backdoor.SdBot.OJ

In the wild: No

Destructive: No

Language: English

Platform: Windows 95, 98, ME, NT, 2000, XP

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:

High

Distribution potential:

Low

Description: 
This backdoor drops a copy of itself on the target system. It connects to an Internet Relay Chat (IRC) server, where a remote user is able to perform the following operations on the compromised system:

  • Spy on a chat room
  • Join a chat room
  • Send messages the chat rooms
  • Attempt to execute downloaded files
  • Perform a DoS attack through syn flooding

It runs on Windows 95, 98, ME, NT, 2000 and XP.

For additional information about this threat, see:

Description created: Nov. 9, 2003 4:57:32 PM GMT -0800
Description updated: Jan. 4, 2004 5:24:36 PM GMT -0800


TECHNICAL DETAILS


Size of malware: 18,944 Bytes (Aspack compressed)
36,846 Bytes (uncompressed)

Initial samples received on: Nov 9, 2003

Details:

Installation

Upon execution, this backdoor drops a copy of itself in the System32 directory, using the following file name:

  • MSCONFIG45.EXE

It then creates the follwing registry entry so that it automatically executes at every Windows startup:

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\
CurrentVersion\RunServices\ MSConfig45 = �MSConfig45.exe�

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\
CurrentVersion\Run\
MSConfig45 = �MSConfig45.exe�

Backdoor Routine

This backdoor connects to a specific IRC (Internet Relay Chat) server and joins a specific channel. It then implements commands received from this channel.

This malware is able to do the following actions on the affected system, as commanded by a remote user:

  • Spy on a chat room
  • Join a chat room
  • Send messages the chat rooms
  • Attempt to execute downloaded files
  • Perform a DoS attack through syn flooding

Other Details

The malware process is hidden in Windows 95, 98 and ME task bars.




Analysis by: Daniel M. Biado


SOLUTION


Minimum scan engine version needed: 5.600

Pattern file needed: 1.676.57

Pattern release date: Nov 9, 2003


Important note: The "Minimum scan engine" refers to the earliest Trend Micro scan engine version guaranteed to detect this threat. However, Trend Micro strongly recommends that you update to the latest version in order to get comprehensive protection. Download the latest scan engine here.

Solution:

Identifying the Malware Program

Before proceeding to remove this malware, first identify the malware program.

Scan your system with Trend Micro antivirus and NOTE all files detected as BKDR_SDBOT.OJ. To do this, Trend Micro customers must download the latest pattern file and scan their system. Other Internet users can use HouseCall, Trend Micro's free online virus scanner.

Terminating the Malware Program

This procedure terminates the running malware process from memory. You will need the name(s) of the file(s) detected earlier.

  1. Open Windows Task Manager. Press
    CTRL%20SHIFT%20ESC, then click the Processes tab.
  2. In the list of running programs*, locate the malware file or files detected earlier.
  3. Select one of the detected files, then press either the End Task or the End Process button, depending on the version of Windows on your system.
  4. Do the same for all detected malware files in the list of running processes.
  5. To check if the malware process has been terminated, close Task Manager, and then open it again.
  6. Close Task Manager.

*NOTE: On systems running Windows 95/98/ME, Task Manager may not show certain processes. You may use a third party process viewer to terminate the malware process. Otherwise, continue with the next procedure, noting additional instructions.

Removing Autostart Entries from the Registry

Removing autostart entries from the registry prevents the malware from executing during startup.

  1. Open Registry Editor. To do this, click Start>Run, type Regedit, then press Enter.
  2. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>Software>Microsoft>
    Windows>CurrentVersion>Run
  3. In the right panel, locate and delete the entry or entries:
    MSConfig45 = �MSConfig45.exe�
  4. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>Software>Microsoft>
    Windows>CurrentVersion>RunServices
  5. In the right panel, locate and delete the entry or entries:
    MSConfig45 = �MSConfig45.exe�
  6. Close Registry Editor.
NOTE: If you were not able to terminate the malware process from memory as described in the previous procedure, restart your system.

Additional Windows ME/XP Cleaning Instructions

Running Trend Micro Antivirus

Scan your system with Trend Micro antivirus and delete all files detected as BKDR_SDBOT.OJ. To do this, Trend Micro customers must download the latest pattern file and scan their system. Other Internet users can use HouseCall, Trend Micro�s free online virus scanner.


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