WORM_SDBOT.AJO

Malware type: Worm

Aliases: Backdoor.Win32.SdBot.gen (Kaspersky), W32/Sdbot.worm.gen.bj (McAfee), Bloodhound.Morphine (Symantec), Worm/SdBot.62976.59 (Avira), W32/Sdbot-Fam (Sophos),

In the wild: Yes

Destructive: No

Language: English

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

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:

High

Distribution potential:

High

Description: 

This worm arrives as FAXNETI.EXE on targe machines. It generates IP addresses and spreads by attempting to drop a copy of itself in target addresses' default shares. If the said shares are inaccessible, it uses hardcoded list of user names and passwords as its login credential to gain access and perform its propagation routine.

It may also spread by taking advantage of systems vulnerable to RPC/DCOM vulnerability, which allows an attacker to gain full access and execute any code on a target machine by sending a malformed packet to the DCOM service. It uses the RPC TCP port 135. More information on this vulnerability is found in Microsoft Security Bulletin MS03-026.

This worm has a built-in IRC client engine, which enables it to connect to an IRC channel. It opens a random port and awaits for the a list of commands, which it executes locally, from a remote malious user. It also performs a denial of service attack against target sites. Furthermore, it steals Windows product ID as well as CD keys of popular games installed on affected systems.

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

For additional information about this threat, see:

Description created: Jan. 19, 2005 12:01:52 AM GMT -0800


TECHNICAL DETAILS


Size of malware: 62,976 Bytes

Initial samples received on: Jan 19, 2005

Details:

Installation and Autostart

Upon execution, this memory-resident worm drops a copy of itself as FAXNETI.EXE in the Windows system folder.

It then adds the following autostart entries to ensure its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
L0aders = �Faxneti.exe�

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\RunServices
L0aders = �Faxneti.exe�

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
L0aders = �Faxneti.exe�

Network Propagation and Exploits

This worm generates IP addresses and spreads by attempting to drop a copy of itself in target addresses' default shares. The said shares are as follows:

  • ADMIN$
  • ADMIN$\system32
  • C$
  • C$\Windows\system32
  • C$\WINNT\system32
  • D$
  • IPC$
  • PRINT$

If the said shares are inaccessible, it uses a hardcoded list of user names and passwords as its login credential to gain access and perform its propagation routine.

This worm may also spread by taking advantage of systems vulnerable to RPC/DCOM vulnerability, which allows an attacker to gain full access and execute any code on a target machine by sending a malformed packet to the DCOM service. It uses the RPC TCP port 135. More information on this vulnerability is found in Microsoft Security Bulletin MS03-026.

Backdoor Capabilities

This worm has a built-in IRC client engine, which enables it to connect to an IRC channel. It opens a random port and awaits for the following commands, which it executes locally, from a remote malious user:

  • Change IRC server
  • Delete the original server file
  • Disconnect/reconnect to the server
  • Download a file from a Web site
  • Download a file from FTP
  • Enable termination of antivirus software programs
  • Enable/disable shares
  • Execute a file from a Web site
  • Execute a file from an FTP
  • Execute an .EXE file
  • Flush DNS cache
  • Generate a new random nick
  • Join/leave an IRC channel
  • List all processes
  • Open a file
  • Perform a mode change
  • Read command(s) from a specified URL
  • Send a private message through IRC
  • Send a file using DCC command
  • Terminate processes
  • Terminate itself
  • Uninstall itself
  • Update the bot from a Web site
  • Update itself from an FTP
  • Visit a URL
  • Webcam capture

Denial of Service

This worm performs a denial of service attack against target sites using any of the following flood methods:

  • HTTP flood
  • ICMP flood
  • SYN flood
  • UDP flood

Information Theft

This worm steals Microsoft product ID as well as CD keys of the following popular games:

  • Battlefield 1942
  • Battlefield 1942 Road To Rome
  • Command & Conquer Generals
  • Counter-Strike
  • FIFA 2003
  • Half-Life
  • Need For Speed Hot Pursuit 2
  • Neverwinter
  • Project IGI 2
  • Rainbow Six III RavenShield
  • Soldier of Fortune II - Double Helix
  • Unreal Tournament 2003

Other Details

This worm is compiled in Microsoft Visual C%20%20 and is compressed using PECompact and Morphine.




Analysis by: Karmina Aquino


SOLUTION


Minimum scan engine version needed: 6.810

Pattern file needed: 2.360.04

Pattern release date: Jan 19, 2005


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

To remove this malware, first identify the malware program.

  1. Scan your system with your Trend Micro antivirus product.
  2. NOTE all files detected as WORM_SDBOT.AJO.

Trend Micro customers need to download the latest pattern file before scanning their system. Other users can use Housecall, Trend Micro�s free online virus scanner.

Terminating the Malware Program

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

  1. Open Windows Task Manager.
    � On Windows 98 and ME, press
    CTRL%20ALT%20DELETE
    � On Windows NT, 2000, and XP, press
    CTRL%20SHIFT%20ESC, then click the Processes tab.
  2. In the list of running programs*, locate the malware file(s) 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 98 and ME, Windows Task Manager may not show certain processes. You can use a third party process viewer such as Process Explorer 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 at startup.

  1. Open Registry Editor. 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:
    L0aders = �Faxneti.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:
    L0aders = �Faxneti.exe�
  6. In the left panel, double-click the following:
    HKEY_CURRENT_USER>Software>Microsoft>
    Windows>CurrentVersion>Run
  7. In the right panel, locate and delete the entry:
    L0aders = �Faxneti.exe�
  8. Close Registry Editor.

NOTE: If you were not able to terminate the malware process as described in the previous procedure, restart your system.

Additional Windows ME/XP Cleaning Instructions

Users running Windows ME and XP must disable System Restore to allow full scanning of infected systems.

Users running other Windows versions can proceed with the succeeding procedure sets.

Running Trend Micro Antivirus

Scan your system with Trend Micro antivirus and delete all files detected as WORM_SDBOT.AJO. 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.

Applying Patch

This malware exploits known vulnerability in Windows. Download and install the fix patch supplied by Microsoft in the following page:

Refrain from using the affected software until the appropriate patch has been installed.




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