WORM_RBOT.ATF

Malware type: Worm

Aliases: Backdoor.Win32.Rbot.gen (Kaspersky), W32/Sdbot.worm.gen.l (McAfee), W32.Spybot.Worm (Symantec), Worm/Rbot.121344.8 (Avira), Mal/Packer (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 takes advantage of the following Windows vulnerabilities to propagate across networks:

  • Remote Procedure Call (RPC) Distributed Component Object Model (DCOM) Vulnerability
  • IIS/WebDAV Vulnerability
  • LSASS Vulnerability

More information on these vulnerabilities can be found on the following Web pages:

It also propagates via network shares. It searches for certain network shares and attempts to drop copies of itself into these shares if they have full access rights. However, if the shared folders have restricted access rights, it attempts to log on using a list of user names and passwords.

It has backdoor capabilities. It has a built-in Internet Relay Chat (IRC) client engine, which enables it to connect to an IRC channel. It then opens a random port and listens for commands issued by a remote user. It performs these commands locally on an infected system, providing the remote user virtual control over the system.

This worm is capable of performing distributed denial of service (DDoS) attacks.

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

For additional information about this threat, see:

Description created: Nov. 9, 2004 10:28:24 AM GMT -0800


TECHNICAL DETAILS


Size of malware: 99,328 Bytes

Initial samples received on: Nov 9, 2004

Variant ofWORM_RBOT.A

Payload 1: Compromises system security

Payload 2: Launches DDoS attacks

Details:

Installation and Autostart Techniques

Upon execution, this memory-resident worm drops a copy of itself as MANAGER32.EXE in the Windows system folder.

To ensure its automatic execution at every Windows startup, it creates the following registry entries:

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\
CurrentVersion\Run
MS Manager32 Startup = "manager32.exe"

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\
CurrentVersion\RunServices
MS Manager32 Startup = "manager32.exe"

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\RunServices
MS Manager32 Startup = "manager32.exe"

Network Propagation and Exploits

This worm takes advantage of the following Windows vulnerabilities to propagate across networks:

  • Remote Procedure Call (RPC) Distributed Component Object Model (DCOM) Vulnerability
  • IIS/WebDAV Vulnerability
  • LSASS Vulnerability

More information on these vulnerabilities can be found on the following Web pages:

It also propagates via network shares. It searches for the following network shares:

  • ADMIN$
  • C$
  • D$
  • IPC$

If these folders have full access rights, this worm attempts to drop a copy itself into these network shares. However, if these shared folders have restricted access rights, it attempts to log on using the following list of user names and passwords:

User names:

  • a
  • aaa
  • abc
  • admin
  • Administrador
  • Administrateur
  • administrator
  • asdf
  • Default
  • Dell
  • Gast
  • Guest
  • home
  • Inviter
  • login
  • mgmt
  • Owner
  • pc
  • qwer
  • Standard
  • temp
  • Test
  • test
  • User
  • win
  • x
  • xyz

Passwords:

  • 0
  • 000000
  • 00000000
  • 007
  • 1
  • 110
  • 111
  • 111111
  • 11111111
  • 12
  • 121212
  • 123
  • 123123
  • 1234
  • 12345
  • 123456
  • 1234567
  • 12345678
  • 123456789
  • 1234qwer
  • 123abc
  • 123asd
  • 123qwe
  • 2002
  • 2003
  • 2600
  • 54321
  • 654321
  • 88888888
  • a
  • aaa
  • abc
  • abcd
  • Admin
  • administrator
  • alpha
  • asdf

Backdoor Capabilities

This worm has backdoor capabilities. It has a built-in Internet Relay Chat (IRC) client engine, which enables it to connect to an IRC channel. It then opens a random port and listens for commands issued by a remote user, such as the following:

  • Add registry autostart value
  • Add service with specified name
  • Capture image using webcam
  • Capture screenshot
  • Change IRC server
  • Delete registry autostart value
  • Delete service with specified name
  • Delete the original server file
  • Disconnect or reconnect to the server
  • Download a file from FTP
  • Enable or disable shares
  • Enable or disable shell handler
  • Enable or disable sniffer
  • Execute a command line function
  • Execute a file from a Web site
  • Execute a file from an FTP
  • Execute an .EXE file
  • Flush DNS
  • Generate a new random nick
  • Join or leave an IRC channel
  • Lists all processes
  • Lists all services
  • Load malware configuration from a file
  • Log keystrokes
  • Log on or log off the user
  • Open a file
  • Perform a mode change
  • Save malware configuration to a file
  • Search for file
  • Send a file over DCC
  • Send a private message through IRC
  • Terminate processes
  • Terminate the malware
  • Update itself from a Web site
  • Update itself from an FTP

Denial of Service

This worm is capable of performing distributed denial of service (DDoS) attacks using the following methods:

  • HTTP flood
  • ICMP flood
  • SYN flood
  • UDP flood



Analysis by: Marvin Cruz


SOLUTION


Minimum scan engine version needed: 6.810


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 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 process:
    MANAGER32.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, 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:
    MS Manager32 Startup = "manager32.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:
    MS Manager32 Startup = "manager32.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:
    MS Manager32 Startup = "manager32.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

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 all files detected as WORM_RBOT.ATF. 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.

Applying Patches

This malware exploits known vulnerabilities in Windows. Download and install the fix patches from the following Web pages:

Trend Micro advises users to download critical patches upon release by vendors.


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