WORM_SPYBOT.ALQ

Malware type: Worm

Aliases: W32.Spybot.Worm (Symantec), DR/Delphi.Gen (Avira), W32/Esbot-B (Sophos),

In the wild: Yes

Destructive: No

Language: English

Platform: Windows 98, ME, NT, 2000, XP, Server 2003

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:

High

Distribution potential:

High

Infection Channel 1 : Propagates via network shares


Description: 

Similar to other SPYBOT variants, this memory-resident worm spreads by dropping copies of itself in several network shared folders. If these shares are password-protected, this worm uses cached passwords it gathers, as well as its own list of user names and passwords, in order to gain access.

It also has backdoor capabilities, and may execute commands coming from a remote malicious user. The said routine provides the remote user virtual control over the affected machine, thus compromising system security.

For additional information about this threat, see:

Description created: Dec. 4, 2005 8:49:05 AM GMT -0800


TECHNICAL DETAILS


File type: PE

Memory resident:  Yes

Size of malware: 192,512 Bytes

Ports used: Random

Initial samples received on: Nov 29, 2005

Payload 1: Compromises system security

Details:

Installation and Autostart Technique

Upon execution, this memory-resident worm drops a copy of itself in the Windows system folder as the file driveinfo.exe. It then creates the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Drive Info = "driveinfo.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunServices
Drive Info = "driveinfo.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Drive Info = "driveinfo.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\RunServices
Drive Info = "driveinfo.exe"

It also creates the following registry entries as part of its installation routine:

HKEY_CURRENT_USER\Software\Microsoft\OLE
Drive Info = "driveinfo.exe"

HKEY_CURRENT_USER\SYSTEM\CurrentControlSet\
Control\Lsa
Drive Info = "driveinfo.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Ole
Drive Info = "driveinfo.exe"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\Lsa
Drive Info = "driveinfo.exe"

Network Propagation

This worm spreads by dropping copies of itself in the following network shares:

  • ADMIN$
  • ADMIN$\system32
  • IPC$

If these shares are password-protected, this worm uses cached passwords it gathers, as well as its own list of user names and passwords, in order to gain access.

Backdoor Capabilities

This worm also has backdoor capabilities. It opens a random port and operates as an Internet Relay Chat (IRC) bot that connects to an IRC server. It then joins an IRC channel, where it waits for certain commands coming from a remote malicious user. It executes these commands on local machine, providing the remote user virtual control over the affected system.

Some of these commands are as follows:

Other Details

This worm runs on Windows 98, ME, NT, 2000, XP, and Server 2003.

Analysis By: Benjamin Rivera


SOLUTION


Minimum scan engine version needed: 7.000

Pattern file needed: 2.982.05

Pattern release date: Dec 2, 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 the path and file name of all files detected as WORM_SPYBOT.ALQ.

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

If the process you are looking for is not in the list displayed by Task Manager, proceed to the succeeding solution set.

  1. Open Windows Task Manager.
    • On Windows 98 and ME, press
    CTRL%20ALT%20DELETE
    • On Windows NT, 2000, XP, and Server 2003, 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. If you were not able to terminate the malware process as described in the previous procedure, restart your system.

Editing the Registry

This malware modifies the system's registry. Users affected by this malware may need to modify or delete specific registry keys or entries. For detailed information regarding registry editing, please refer to the following articles from Microsoft:

  1. HOW TO: Backup, Edit, and Restore the Registry in Windows 95, Windows 98, and Windows ME
  2. HOW TO: Backup, Edit, and Restore the Registry in Windows NT 4.0
  3. HOW TO: Backup, Edit, and Restore the Registry in Windows 2000
  4. HOW TO: Back Up, Edit, and Restore the Registry in Windows XP and Server 2003

Removing Autostart Entries from the Registry

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

If the registry entries below are not found, the malware may not have executed as of detection. If so, proceed to the succeeding solution set.

  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:
    Drive Info = "driveinfo.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:
    Drive Info = "driveinfo.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:
    Drive Info = "driveinfo.exe"
  8. In the left panel, double-click the following:
    HKEY_CURRENT_USER>Software>Microsoft>
    Windows>CurrentVersion>RunServices
  9. In the right panel, locate and delete the entry:
    Drive Info = "driveinfo.exe"

Removing Other Malware Entries from the Registry

  1. Still in the Registry Editor, in the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>
    Control>Lsa
  2. In the right panel, locate and delete the entry:
    Drive Info = "driveinfo.exe"
  3. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Ole
  4. In the right panel, locate and delete the entry:
    Drive Info = "driveinfo.exe"
  5. In the left panel, double-click the following:
    HKEY_CURRENT_USER>SYSTEM>CurrentControlSet>
    Control>Lsa
  6. In the right panel, locate and delete the entry:
    Drive Info = "driveinfo.exe"
  7. In the left panel, double-click the following:
    HKEY_CURRENT_USER>Software>Microsoft>OLE
  8. In the right panel, locate and delete the entry:
    Drive Info = "driveinfo.exe"
  9. Close Registry Editor.

Important 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 set(s).

Running Trend Micro Antivirus

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




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