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Virus:Worm/SdBot.59904.15
Date discovered:15/11/2005
Type:Worm
In the wild:Yes
Reported Infections:Low
Distribution Potential:Medium
Damage Potential:Medium
Static file:Yes
File size:59.904 Bytes
MD5 checksum:453b23838e4c0C1ecebc635092f32112
VDF version:6.32.00.183

 General Method of propagation:
   • Local network


Aliases:
   •  Symantec: W32.Spybot.Worm
   •  Kaspersky: Backdoor.Win32.SdBot.aig
   •  TrendMicro: WORM_SDBOT.CQB
   •  F-Secure: Backdoor.Win32.SdBot.aig
   •  Sophos: W32/Rbot-AXG
   •  Panda: W32/Sdbot.FPR.worm
   •  VirusBuster: Worm.Rbot.DBX
   •  Bitdefender: Backdoor.Sdbot.AIG


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%\shost.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\CurrentControlSet\Services\ServiceHost
   • "Type"=dword:00000110
   • "Start"=dword:00000002
   • "ErrorControl"=dword:00000000
   • "ImagePath"="%WINDIR%\shost.exe"
   • "DisplayName"="Service Hosts"
   • "ObjectName"="LocalSystem"
   • "FailureActions"=%hex values%
   • "Description"="Service Hosts"



The value of the following registry key is removed:

–  HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Shell Extensions
   • "ALGM"="%malware execution directory%\%executed file%"



The following registry keys are added:

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

– HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Shell Extensions
   • "ALGM"="%malware execution directory%\%executed file%"



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$
   • ADMIN$


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

–Cached usernames and passwords.

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


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 Servers:

Server: j.m3gak**********
Port: 4367
Channel: #it
Nickname: [P00|USA|%five-digit random character string%]
Password: z

Server: j.m3gak**********
Port: 4367
Channel: #it-s
Nickname: [P00|USA|%five-digit random character string%]
Password: z

Server: j.m3gak**********
Port: 4367
Channel: #blood-e
Nickname: [P00|USA|%five-digit random character string%]
Password: z



– This malware has the ability to collect and send information such as:
    • Malware uptime
    • Information about running processes


– Furthermore it has the ability to perform actions such as:
    • Disable network shares
    • Download file
    • Enable network shares
    • Execute file
    • Kill process
    • Perform DDoS attack
    • Perform network scan
    • Updates itself

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

 Miscellaneous Mutex:
It creates the following Mutex:
   • Z3I

 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.

Description inserted by Irina Boldea on Monday, April 17, 2006
Description updated by Irina Boldea on Monday, April 17, 2006

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