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Virus:Worm/SdBot.50227
Date discovered:10/11/2005
Type:Worm
In the wild:Yes
Reported Infections:Low
Distribution Potential:Medium
Damage Potential:Medium
Static file:Yes
File size:50.227 Bytes
MD5 checksum:e6e7fd8c69729fd4b88279fcaf112ef0
VDF version:6.32.00.164

 General Method of propagation:
   • Local network


Aliases:
   •  Symantec: W32.Spybot.Worm
   •  Kaspersky: Backdoor.Win32.SdBot.xd
   •  TrendMicro: WORM_SDBOT.COF
   •  F-Secure: Backdoor.Win32.SdBot.xd
   •  Sophos: W32/Tilebot-AX
   •  Panda: Bck/Sdbot.FJB
   •  VirusBuster: Worm.SdBot.BNO
   •  Bitdefender: Backdoor.SDBot.9053AB6E


Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003


Side effects:
   • Lowers security settings
   • Registry modification
   • Makes use of software vulnerability
   • Third party control

 Files It copies itself to the following location:
   • %WINDIR%\AsnFtpd.exe



It deletes the initially executed copy of itself.

 Registry The following registry keys are added in order to load the service after reboot:

HKLM\SYSTEM\ControlSet001\Services\ASNFTPD
   • "Type"=dword:00000110
   • "Start"=dword:00000002
   • "ErrorControl"=dword:00000000
   • "ImagePath"="%WINDIR%\AsnFtpd.exe"
   • "DisplayName"="ASNFTP daemon"
   • "ObjectName"="LocalSystem"
   • "FailureActions"=%hex values%
   • "Description"="The Windows ASN Ftp Daemon"



The following registry keys are added:

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Shell Extensions
   • "FTPDi"=%current date%
   • "FTPDr"=%double-byte-characters%

HKLM\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate
   • "DoNotAllowXPSP2"=dword:00000001



The following registry keys are changed:

HKLM\SYSTEM\CurrentControlSet\Control
   Old value:
   • "WaitToKillServiceTimeout"=%user defined settings%
   New value:
   • "WaitToKillServiceTimeout"="7000"

HKLM\SOFTWARE\Microsoft\Security Center
   Old value:
   • "UpdatesDisableNotify"=%user defined settings%
   • "AntiVirusDisableNotify"=%user defined settings%
   • "FirewallDisableNotify"=%user defined settings%
   • "AntiVirusOverride"=%user defined settings%
   • "FirewallOverride"=%user defined settings%
   New value:
   • "UpdatesDisableNotify"=dword:00000001
   • "AntiVirusDisableNotify"=dword:00000001
   • "FirewallDisableNotify"=dword:00000001
   • "AntiVirusOverride"=dword:00000001
   • "FirewallOverride"=dword:00000001

Deactivate Windows Firewall:
HKLM\SOFTWARE\Policies\Microsoft\WindowsFirewall\DomainProfile
   Old value:
   • "EnableFirewall"=%user defined settings%
   New value:
   • "EnableFirewall"=dword:00000000

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\
   Auto Update
   Old value:
   • "AUOptions"=%user defined settings%
   New value:
   • "AUOptions"=dword:00000001

HKLM\SYSTEM\CurrentControlSet\Control\Lsa
   Old value:
   • "restrictanonymous"=%user defined settings%
   New value:
   • "restrictanonymous"=dword:00000001

HKLM\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters
   Old value:
   • "AutoShareWks"=%user defined settings%
   • "AutoShareServer"=%user defined settings%
   New value:
   • "AutoShareWks"=dword:00000000
   • "AutoShareServer"=dword:00000000

HKLM\SOFTWARE\Microsoft\Ole
   Old value:
   • "EnableDCOM"=%user defined settings%
   New value:
   • "EnableDCOM"="N"

 Network Infection In order to ensure its propagation the malware attemps to connect to other machines as described below.

It drops copies of itself to the following network shares:
   • IPC$
   • d$\windows\system32
   • d$\winnt\system32
   • c$\windows\system32
   • c$\winnt\system32
   • ADMIN$\system32\
   • ADMIN$


It uses the following login information in order to gain access to the remote machine:

A list of usernames and passwords:
   • admin; root; server; asdfgh; asdf; !@; $%^&; !@; $%^; !@; $%; !@; $;
      654321; 123456; 12345; 1234; 123; 111; administrator



Exploit:
It makes use of the following Exploits:
– MS02-061 (Elevation of Privilege in SQL Server Web)
– MS03-026 (Buffer Overrun in RPC Interface)
– MS03-039 (Buffer Overrun in RPCSS Service)
– MS03-049 (Buffer Overrun in the Workstation Service)
– MS04-007 (ASN.1 Vulnerability)
– MS04-011 (LSASS Vulnerability)
– MS05-039 (Vulnerability in Plug and Play)


IP address generation:
It creates random IP addresses while it keeps the first two octets from its own address. Afterwards it tries to establish a connection with the created addresses.


Infection process:
Creates an FTP script on the compromised machine in order to download the malware to the remote location.


Remote execution:
It attempts to schedule a remote execution of the malware, on the newly infected machine. Therefore it uses the NetScheduleJobAdd function.

 IRC To deliver system information and to provide remote control it connects to the following IRC Server:

Server: whitehouse.d0n**********
Port: 4243
Channel: #raithe
Nickname: [P00|USA|%five-digit random character string%]



 This malware has the ability to collect and send information such as:
    • Cached passwords
     Collected Email addresses
    • CPU speed
    • Current user
     Details about drivers
    • Free disk space
    • Free memory
    • Information about the network
    • Information about running processes
    • Size of memory
    • Username
    • Information about the Windows operating system


 Furthermore it has the ability to perform actions such as:
     Launch DDoS ICMP flood
     Launch DDoS SYN flood
     Launch DDoS UDP flood
    • Disable network shares
    • Download file
    • Enable network shares
    • Execute file
    • Kill process
    • Perform DDoS attack
     Perform network scan
    • Perform port redirection
     Updates itself
    • Upload file

 Process termination  List of services that are disabled:
   • Security Center
   • Telnet
   • Remote Registry
   • Messenger

 Backdoor Contact server:
All of the following:
   • http://hpcgi1.nifty.com/mute/c/**********
   • http://www.age.ne.jp/x/maxwell/cgi-bin/**********
   • http://www2.dokidoki.ne.jp/tomocrus/cgi-bin/check/**********
   • http://cgi14.plala.or.jp/little_w/**********
   • http://yia.s22.xrea.com/**********
   • http://www.kinchan.net/cgi-bin/**********


 Miscellaneous It creates the following Mutex:
   • 0xFEDCBAFF

 File details Programming language:
The malware program was written in MS Visual C++.


Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

Descripción insertada por Irina Boldea el viernes 14 de abril de 2006
Descripción actualizada por Irina Boldea el viernes 14 de abril de 2006

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