WORM_SDBOT.ARK

Malware type: Worm

Aliases: Backdoor.Win32.SdBot.aad (Kaspersky), Generic.dk (McAfee), W32.Spybot.Worm (Symantec), TR/Crypt.XPACK.Gen (Avira), Mal/Emogen-U (Sophos),

In the wild: Yes

Destructive: No

Language: English

Platform: Windows NT, 2000, XP

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:

High

Distribution potential:

High

Description: 

This worm propagates via network shares. It uses a list of user names and passwords to gain access to other systems in the network. It then attempts to drop copies of itself in network shares of successfully accessed systems.

It also takes advantage of the following Windows vulnerabilities to propagate across networks:

  • Remote Procedure Call (RPC) Locator vulnerability
  • 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:

This worm has backdoor capabilities. It connects an IRC server, where it listens for commands coming from a remote malicious user. It executes these commands locally on an infected system, providing the remote user virtual control over the system.

Apart from its capability to steal CD keys, it retrieves passwords and other sensitive information. It does this by using a carnivore network sniffer that checks for certain strings in packets.

It can also perform a denial of service attack against a target site using several methods.

For additional information about this threat, see:

Description created: Feb. 25, 2005 9:47:19 AM GMT -0800
Description updated: Feb. 25, 2005 9:54:20 AM GMT -0800


TECHNICAL DETAILS


File type: PE

Memory resident:  Yes

Size of malware: 90,112 Bytes

Initial samples received on: Feb 25, 2005

Compression type: Morphine

Vulnerability used:  (MS04-011) Security Update for Microsoft Windows (835732), (MS03-001) Unchecked Buffer in Locator Service Could Lead to Code Execution (810833), (MS03-007) Unchecked Buffer In Windows Component Could Cause Server Compromise (815021), (MS03-026) Buffer Overrun In RPC Interface Could Allow Code Execution

Details:

Arrival and Installation

Upon execution, this worm drops a copy of itself as lsasss.exe in the Windows system folder.

It creates the following registry entries to ensure its automatic execution at every Windows startup:

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\
CurrentVersion\Run
m4n70s Personal Firewall = "m4n70s.exe"

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\
CurrentVersion\RunServices
m4n70s Personal Firewall = "m4n70s.exe"

HKEY_CURRENT_USER\Software\Microsoft\Windows\
CurrentVersion\Run
m4n70s Personal Firewall = "m4n70s.exe"

It also modifies the following registry entries:

HKEY_LOCAL_MACHINE\Software\Microsoft\Ole
EnableDCOM= From "Y" to �N�

HKEY_LOCAL_MACHINE\System\CurrentControlSet\
Control\Lsa
Restrictanonymous = From �dword:00000000� To �dword:00000001�

Network Propagation

This worm propagates via network shares. It uses the following user names and passwords to gain access to other systems in the network:

  • 12345
  • 123456
  • 1234567
  • 12345678
  • 123456789
  • 1234567890
  • access
  • accounting
  • accounts
  • administrador
  • administrat
  • administrateur
  • administrator
  • admins
  • backup
  • bitch
  • blank
  • brian
  • changeme
  • chris
  • cisco
  • compaq
  • computer
  • control
  • database
  • databasepass
  • databasepassword
  • db1234
  • dbpass
  • dbpassword
  • default
  • domain
  • domainpass
  • domainpassword
  • exchange
  • george
  • guest
  • hello
  • homeuser
  • internet
  • intranet
  • katie
  • linux
  • login
  • loginpass
  • nokia
  • oeminstall
  • oemuser
  • office
  • oracle
  • orainstall
  • outlook
  • owner
  • pass1234
  • passwd
  • password
  • password1
  • peter
  • qwerty
  • server
  • siemens
  • sqlpassoainstall
  • staff
  • student
  • susan
  • system
  • teacher
  • technical
  • win2000
  • win2k
  • win98
  • windows
  • winnt
  • winpass
  • winxp
  • wwwadmin

It then attempts to drop copies of itself in the following network shares of successfully accesssed systems:

  • ADMIN$\system32
  • C$\Windows\system32
  • C$\WINNT\system32

It also takes advantage of the following Windows vulnerabilities to propagate across networks:

  • Remote Procedure Call (RPC) Locator vulnerability
  • 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:

When it finds a vulnerable target system, it drops and executes a copy of itself on the system.

Backdoor Capabilities

This worm connects to the Internet Relay Chat (IRC) server netopiax.bounceme.net using the nickname RaW-<random digits>. It then listens for commands coming from a remote malicious user, such as the following:

  • Scan for exploits
  • Retrieve CD keys of the following games:
    • 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
    • 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
    • Microsoft Windows
    • 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)
    • NHL 2002
    • NHL 2003
    • 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
  • Download files
  • Log keystrokes
  • List processes
  • Perform denial of service (DoS) attack
  • Locate files on target system
  • List threads
  • Retrieve network information
  • Kill processes
  • Kill threads
  • Delete files
  • Send files via the DCC IRC command
  • List shares in system
  • Capture screen
  • Clone itself
  • Send an email
  • Download file via FTP

It executes these commands locally on an infected system, providing the remote user virtual control over the system.

Information Theft

Apart from its capability to steal CD keys, this worm retrieves passwords and other sensitive information. It does this by using a carnivore network sniffer that checks for the following strings in packets:

  • : auth
  • : login
  • :!auth
  • :!hashin
  • :!login
  • :!secure
  • :!syn
  • :$auth
  • :$hashin
  • :$login
  • :$syn
  • :%auth
  • :%hashin
  • :%login
  • :%syn
  • :&auth
  • :&login
  • :'auth
  • :'login
  • :*auth
  • :*login
  • :%20auth
  • :%20login
  • :,auth
  • :,login
  • :-auth
  • :-login
  • :.auth
  • :.hashin
  • :.login
  • :.secure
  • :.syn
  • :/auth
  • :/login
  • :=auth
  • :=login
  • :?auth
  • :?login
  • :@auth
  • :@login
  • :\auth
  • :\login
  • :~auth
  • :~login
  • CDKey
  • JOIN #
  • login
  • login
  • NICK
  • now an IRC Operator
  • oper
  • OPER
  • PASS
  • PAYPAL
  • paypal
  • PAYPAL.COM
  • paypal.com
  • Set-Cookie:
  • USER

Denial of Service Attack

This worm can perform a denial of service attack against a target site using the following methods:

  • Ping flood
  • Syn flood
  • UDP flood

Other Details

This worm is compressed using FSG and compiled using Microsoft Visual C%20%20. It runs on Windows NT, 2000, and XP.

Analysis By: Patrick Estavillo


SOLUTION


Minimum scan engine version needed: 6.810

Pattern file needed: 3.833.00

Pattern release date: Oct 11, 2006


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 NT, 2000, and XP, press
    CTRL%20SHIFT%20ESC, then click the Processes tab.
  2. In the list of running programs*, locate the process:
    m4n70s.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.

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:
    m4n70s Personal Firewall = "m4n70s.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:
    m4n70s Personal Firewall = "m4n70s.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:
    m4n70s Personal Firewall = "m4n70s.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.

Restoring Modified Entries from the Registry

  1. Still in the Registry Editor, in the left panel, double-click the following:
    HKEY_CURRENT_USER>Software>Microsoft>
    OLE
  2. In the right panel, locate and modify the entry:
    EnableDCOM = From "N" to "Y"
  3. Close Registry Editor.

Restoring EnableDCOM and RestrictAnonymous Registry Entries

This malware modifies EnableDCOM and RestrictAnonymous registry entries to a certain value. To know more about restoring these registries to their original values, please refer to these articles:

  1. COM security frequently asked questions
  2. How to disable DCOM support in Windows
  3. How to Use the RestrictAnonymous Registry Value in Windows 2000
  4. The "RestrictAnonymous" Registry Value May Break the Trust to a Windows 2000 Domain

Additional Windows XP Cleaning Instructions

Users running Windows 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 delete all files detected as WORM_SDBOT.ARK. 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 Microsoft Web pages:

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


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