WORM_KAMERAL.A

Malware type: Worm

Aliases: Email-Worm.Win32.Kameral.a (Kaspersky), W32/Kameral.a@MM (McAfee), W32.Kameral (Symantec), Worm/Kameral (Avira), W32/Kameral-A (Sophos),

In the wild: Yes

Destructive: No

Language: English

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

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:

High

Distribution potential:

High

Description: 
This worm drops a copy of itself as the file, MPREXE.EXE in the Windows folder.

(Note: There is another normal file with the same name, MPREXE.EXE, located in the Windows system folder.)

It then modifies the Windows registry so that it is able to run at every system startup.

Analyzing the malware code, it is found that this worm attempts to propagate via email using MAPI (Messaging Application Programming Interface).

The email message has an attached copy of this malware, and includes the following text strings:

I Hope you reply me. Thank you very much for reading my msg Bye.

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

For additional information about this threat, see:

Description created: Dec. 19, 2003 4:39:33 PM GMT -0800
Description updated: Dec. 19, 2003 5:05:34 PM GMT -0800


TECHNICAL DETAILS


Size of malware: 196,663 Bytes (Compressed)
454,656 Bytes (Uncompressed)

Initial samples received on: Dec 19, 2003

Payload 1: Terminates processes

Details:

Installation

Upon execution, this memory-resident worm drops a copy of itself as the following file:

    %Windows%\MPREXE.EXE

(Notes: %Windows% is the default Windows folder, usually C:\Windows or C:\WinNT. There is another normal file with the same name, MPREXE.EXE, located in the Windows system folder.)

This malware then creates the following registry entry so that it is able to run at every system startup:

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\
CurrentVersion\Run
Explorer = "%Windows%\mprexe.exe"

It also creates/modifies the following registry entries:

HKEY_LOCAL_MACHINE\Software\Microsoft\General\Settings
MainServer = "http://www.kamerali.com/ip.txt"

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Policies\System
NoDispCPL = dword:00000001

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Policies\Explorer
DisableRegistryTools = dword:00000001

The last registry entry supposedly disables REGEDIT.EXE but this routine fails to manifest.

Email Propagation

Analyzing the malware code, it is found that this worm attempts to propagate via email using MAPI (Messaging Application Programming Interface).

The email message has an attached copy of this malware, and includes the following text strings:

I Hope you reply me. Thank you very much for reading my msg Bye.

Program Termination

This worm terminates the following processes:

  • NAVAPW32.EXE
  • NAVW32.EXE
  • _AVP32.EXE
  • _AVPCC.EXE
  • _AVPM.EXE
  • AVP32.EXE
  • AVPCC.EXE
  • AVPM.EXE
  • AVP.EXE
  • IAMAPP.EXE
  • IAMSERV.EXE
  • FRW.EXE
  • ZONEALARM.EXE
  • VSMON.EXE
  • BLACKICE.EXE
  • BLACKD.EXE

Other Details

This worm displays a hoax message box containing the text, "WARNING" in the status bar. The image is as follows:

This worm disables the Windows button. Consequently, all hotkeys that use the Windows button are also disabled. It also disables the ALT-TAB hotkey.




Analysis by: Joey N. Costoya


SOLUTION


Minimum scan engine version needed: 5.400

Pattern file needed: 1.705.15

Pattern release date: Dec 19, 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:

Terminating the Malware Program

This procedure terminates the running malware process from memory.

  1. Open Windows Task Manager.
    On Windows 95/98/ME systems, press
    CTRL%20ALT%20DELETE
    On Windows NT/2000/XP systems, press
    CTRL%20SHIFT%20ESC, and click the Processes tab.
  2. In the list of running programs*, locate the process:
    MPREXE.EXE
  3. Select the malware process, then press either the End Task or the End Process button, depending on the version of Windows on your system.
  4. To check if the malware process has been terminated, close Task Manager, and then open it again.
  5. Close Task Manager.

*NOTE: On systems running Windows 95/98/ME, Windows 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.

To remove the malware autostart entries:

  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:
    Explorer = "%Windows%\mprexe.exe"
    Note: %Windows% is the default Windows folder, usually C:\Windows or C:\WinNT.
  4. 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.

Restoring other Registry Entries

  1. Still in Registry Editor, double click on the following registry key in the left panel
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\General\Settings
  2. In the right panel, locate and delete the registry entry:
    MainServer = "http://www.kamerali.com/ip.txt"
  3. In the left panel, double-click on the following:
    HKEY_CURRENT_USER\Software\Microsoft\Windows\
    CurrentVersion\Policies\System
  4. In the right panel, locate and delete the entry:
    NoDispCPL
  5. In the left panel, double-click on the following:
    HKEY_CURRENT_USER\Software\Microsoft\Windows\
    CurrentVersion\Policies\Explorer
  6. In the right panel, locate and delete the entry:
    DisableRegistryTools
  7. Close the Registry Editor.

Additional Windows ME/XP Cleaning Instructions

Running Trend Micro Antivirus

Scan your system with Trend Micro antivirus and delete all files detected as WORM_KAMERAL.A. 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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