Malware type: Worm

Aliases: Backdoor.Win32.IRCBot.bri (Kaspersky), Generic PWS.y (McAfee), W32.Spybot.Worm (Symantec), Worm/IrcBot.603136 (Avira),

In the wild: Yes

Language: English

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

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:


Distribution potential:


This memory-resident worm spreads through network shares and attempts to access machines using a long list of common user names and weak passwords.

This worm also has backdoor capabilities. It connects to a specific Internet Relay Chat (IRC) server on port 6667. It then joins a particular IRC channel where it receives several malicious commands. It also steals CD keys of certain game applications.

For additional information about this threat, see:

Description created: May. 2, 2005 4:36:50 AM GMT -0800


File type: PE

Memory resident:  Yes

Size of malware: 91,206 Bytes

Initial samples received on: Apr 17, 2005

Compression type: Yoda's Cryptor

Payload 1: Compromises Network Security

Trigger condition 1: Upon execution


Arrival and Installation

Upon execution, this memory-resident worm drops a copy of itself in the Windows system folder as KIMOCHI.EXE. It also adds the following entries in registy to ensure its automatic execution at every startup:

System Startup = "kimochi.exe"

System Startup = "kimochi.exe"

System Startup = "kimochi.exe"

(Note: %Windows% is the default Windows folder, usually C:\Windows or C:\WINNT.)

Network Propagation

This worm propagates by searching for the following network shares:


This worm attempts to access password-protected folders using a long list of common user names and weak passwords.

Backdoor Capabilities

This worm has backdoor capabilities. It connects to a certain IRC channel where a malicious user can enter commands. It can allow a malicious user to perform the following actions:

  • Add or delete network shares
  • Command shell execution of files
  • Connect and visit a URL
  • Download files from the compromised system
  • Enable and disable DCOM
  • Flood or sniff packets
  • Flush DNS
  • Get data form the clipboard
  • Get system information
  • Join and leave IRC channel
  • List and terminate processes
  • List network shares
  • Log keystrokes
  • Manipulate for upload iles
  • Scan IP or ports
  • Search for system passwords
  • Send and receive files through IRC
  • Update itself

Information Theft

This malware can also steal CD keys of the following game programs:

  • Battlefield 1942
  • Battlefield 1942 (Road To Rome)
  • Battlefield 1942 (Secret Weapons of WWII)
  • Battlefield Vietnam
  • Black and White
  • Chrome
  • Command and Conquer: Generals
  • Command and Conquer: Generals (Zero Hour)
  • Command and Conquer: Red Alert
  • Command and Conquer: Red Alert 2
  • Command and Conquer: Tiberian Sun
  • Counter-Strike (Retail)
  • FIFA 2002
  • FIFA 2003
  • Freedom Force
  • Global Operations
  • Gunman Chronicles
  • Half-Life
  • Hidden & Dangerous 2
  • IGI 2: Covert Strike
  • Industry Giant 2
  • James Bond 007: Nightfire
  • Legends of Might and Magic
  • Medal of Honor: Allied Assault
  • Medal of Honor: Allied Assault: Breakthrough
  • Medal of Honor: Allied Assault: Spearhead
  • NHL 2002
  • NHL 2003
  • Nascar Racing 2002
  • Nascar Racing 2003
  • Need For Speed Hot Pursuit 2
  • Need For Speed: Underground
  • Neverwinter Nights
  • Neverwinter Nights (Hordes of the Underdark)
  • Neverwinter Nights (Shadows of Undrentide)
  • Rainbow Six III RavenShield
  • Shogun: Total War: Warlord Edition
  • Soldier of Fortune II - Double Helix
  • Soldiers Of Anarchy
  • The Gladiators
  • Unreal Tournament 2003
  • Unreal Tournament 2004

Analysis By: Donne Celadi�a

Revision History:

First pattern file version: 4.678.05
First pattern file release date: Aug 29, 2007


Minimum scan engine version needed: 6.810

Pattern file needed: 4.679.00

Pattern release date: Aug 29, 2007

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.


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_SPYBOT.AII.

Trend Micro customers need to download the latest pattern file before scanning their system. Other users can use Housecall, Trend Micro's 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
    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:
  3. In the right panel, locate and delete the entry:
    System Startup = "kimochi.exe"

  4. (Note: %Windows% is the default Windows folder, usually C:\Windows or C:\WINNT.)
  5. In the left panel, double-click the following:
  6. In the right panel, locate and delete the entry:
    System Startup = "kimochi.exe"
  7. In the left panel, double-click the following:
  8. In the right panel, locate and delete the entry:
    System Startup = "kimochi.exe"
  9. Close Registry Editor.

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 set(s).

Running Trend Micro Antivirus

Scan your system with Trend Micro antivirus and delete files detected as WORM_SPYBOT.AII. 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 online virus scanner.

Trend Micro offers best-of-breed antivirus and content-security solutions for your corporate network, small and medium business, mobile device or home PC.