WORM_RBOT.FPW

Malware type: Worm

Aliases: Backdoor.Win32.Rbot.ckm (Kaspersky), W32/Sdbot.worm (McAfee), IRC Trojan (Symantec), Worm/Rbot.46080.11 (Avira), Troj/StartP-BEN (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


Infection Channel 2 : Propagates via software vulnerabilities


Description: 

This worm may be downloaded unknowingly by a user when visiting malicious Web sites.

It drops copies of itself.

It creates registry entries to enable its automatic execution at every system startup.

It propagates by searching the network for certain shares, into which it attempts to drop copies of itself.

It takes advantage of the LSASS vulnerability to propagate across networks. More information about the said vulnerability may be found on te following Web page:

It opens random ports to join certain channels. It then executes commands issued by a remote malicious user.

For additional information about this threat, see:

Description created: May. 24, 2007 1:16:18 PM GMT -0800


TECHNICAL DETAILS


File type: PE

Memory resident:  Yes

Size of malware: 46,080 Bytes

Ports used: Random

Initial samples received on: May 23, 2007

Vulnerability used:  (MS04-011) Security Update for Microsoft Windows (835732)

Payload 1: Compromises system security

Details:

Arrival Details

This worm may be downloaded unknowingly by a user when visiting malicious Web site(s).

Installation

This worm drops the following copy(ies) of itself:

  • %System%\absecure32.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

Autostart Techniques

This worm creates the following registry entry(ies) to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Office Monitor Secure Systema = "%System%\absecure32.exe"

Propagation via Network Shares

This worm searches the network for the following share(s), into which it attempts to drop copies of itself:

  • ADMIN$
  • IPC$

Propagation via Software Vulnerabilities

This worm takes advantage of the following software vulnerability(ies) to propagate across networks:

  • LSASS ulnverability

More information about the said vulnerability may be found on te following Web page:

Backdoor Capabilities

This worm comes with a built-in Internet Relay Chat (IRC) client, which allows it to connect to an IRC channel. It opens a random port and waits for commands from a remote malicious user. It is capable of doing the following:

  • Download components
  • Execute or terminate existing process
  • Gather system information
  • Perform basic IRC commands
  • Perform port redirection

Affected Platforms

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


SOLUTION


Minimum scan engine version needed: 8.000

Pattern file needed: 4.485.00

Pattern release date: May 23, 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.

Solution:

Terminating the Malware Program

This procedure terminates the running malware process.

  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 process:
      absecure32.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 computer.
  4. To check if the malware process has been terminated, close Task Manager, and then open it again.
  5. Close Task Manager.

*NOTE: On computers 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.

On computers running all Windows platforms, if the process you are looking for is not in the list displayed by Task Manager or Process Explorer, continue with the next solution procedure, noting additional instructions. If the malware process is in the list displayed by either Task Manager or Process Explorer, but you are unable to terminate it, restart your computer in safe mode.

Editing the Registry

This malware modifies the computer'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_CURRENT_USER>Software>Microsoft>
    Windows>CurrentVersion>Run
  3. In the right panel, locate and delete the entry:
    Office Monitor Secure Systema = "%System%\absecure32.exe"

    (Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)
  4. 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 computers.

Users running other Windows versions can proceed with the succeeding solution set(s).

Running Trend Micro Antivirus

If you are currently running in safe mode, please restart your computer normally before performing the following solution.

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

Applying Patch

This malware exploits a known vulnerability. Download and install the fix patch supplied by the vendor. Refrain from using this product until the appropriate patch has been installed. Trend Micro advises users to download critical patches upon release by vendors.




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