WORM_RBOT.CB

Malware type: Worm

Aliases: Packed, W32.Spybot.Worm

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 arrives via network shares, and drops a copy of itself in the Windows System folder as the file GVC.EXE.

This worm also has backdoor capabilities. It connects to an Internet Relay Chat (IRC) server and waits for malicious commands issued by a remote user, which includes launching denial of service (DoS) attacks against target sites. It also steals CD keys of certain game applications

This worm utilizes UPX type compression, and runs on Windows 95, 98, NT, ME, 2000, and XP.

For additional information about this threat, see:

Description created: Jun. 1, 2004 1:02:54 PM GMT -0800


TECHNICAL DETAILS


Size of malware: 52,224 Bytes (compressed); 99,328 Bytes (uncompressed)

Related toWORM_RBOT

Details:

Installation and Autostart Techniques

Upon execution, this worm drops a copy of itself in the Windows system directory as GVC.EXE.

To ensure its automatic execution at system startup, this worm creates the following registry entry:

HKEY_LOCAL_MACHINE\SOFTWARE\
Microsoft\Windows\CurrentVersion\Run
GvC="GVC.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\
Microsoft\Windows\CurrentVersion\RunServices
GvC="GVC.exe"

HKEY_CURRENT_USER\SOFTWARE\
Microsoft\Windows\CurrentVersion\Run
GvC="GVC.exe"

Network Propagation

The worm searches for the following network shares:

  • \Admin$\
  • \Admin$\system32\
  • \c$\
  • \c$\windows\system32\
  • \c$\winnt\system32\
  • \D$\
  • \ipc$
  • \print$\
  • \SharedDocs$\
  • \SharedDocs\

If the folders have full access rights, the worm attempts to copy itself onto these network shares. However, if the shared folders have restricted access rights, the worm attempts a force log in routine by using a list of commonly used user names and passwords.

Backdoor Capabilities

This worm also has backdoor capabilities. It comes with an Internet Relay Chat client, which allows it to connect to an IRC channel and listen for malicious commands issued by the remote user. These commands include the following:

  • Disable network shares
  • Disconnect from IRC server
  • Download, update and execute file from a website
  • Download, update and execute file from FTP
  • Execute an exe file
  • Generate random nick
  • Join an IRC channel
  • Perform a mode change in IRC
  • Perform port redirections
  • Retrieve information such as: amount of RAM available on the system, processor speed, operating system used, time connected to the Internet, local IP address, internet connection type, and uptime
  • Send message to private user
  • Uninstall malware
  • Visit a website
The worm could also perform the following Denial of Service attacks:
  • ICMP flood
  • SYN flood
  • UDP flood

Information Theft

The worm obtains CD Keys of the following software:

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



Analysis by: Karmina Aquino


SOLUTION


Minimum scan engine version needed: 6.500

Pattern file needed: 1.896.45


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_RBOT.CB.

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 95, 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 95, 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:
    GvC="GVC.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:
    GvC="GVC.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:
    GvC="GVC.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

Running Trend Micro Antivirus

Scan your system with Trend Micro antivirus and delete all files detected as WORM_RBOT.CB. 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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