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Virus:Worm/Sdbot.39936.9
Date discovered:18/05/2006
Type:Worm
In the wild:Yes
Reported Infections:Low
Distribution Potential:Medium
Damage Potential:Medium
Static file:Yes
File size:39.936 Bytes
MD5 checksum:05e9876a966f3d9ee124e649509b0Fd0
VDF version:6.34.01.101
IVDF version:6.34.01.103 - Thursday, May 18, 2006

 General Methods of propagation:
   • Local network
   • Mapped network drives


Aliases:
   •  Symantec: W32.Spybot.Worm
   •  TrendMicro: WORM_SDBOT.HM
   •  Eset: IRC/SdBot
   •  Bitdefender: Backdoor.SDBot.6A9913B0


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%\win32host.exe

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

HKLM\SYSTEM\CurrentControlSet\Services\Win32Kernel
   • "Type"=dword:00000110
   • "Start"=dword:00000002
   • "ErrorControl"=dword:00000000
   • "ImagePath"="%WINDIR%\win32host.exe"
   • "DisplayName"="Win32 Kernel Update"
   • "ObjectName"="LocalSystem"
   • "FailureActions"=%hex values%
   • "Description"="Win32 OS Update"



The following registry keys are added:

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

HKLM\SYSTEM\CurrentControlSet\Control
   • "WaitToKillServiceTimeout"="7000"



The following registry keys are changed:

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

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

HKLM\SOFTWARE\Policies\Microsoft\WindowsFirewall\StandardProfile
   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\SYSTEM\CurrentControlSet\Services\lanmanworkstation\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:
   • ADMIN$
   • IPC$
   • C$


Exploit:
It makes use of the following Exploits:
– 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)
– 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 Servers:

Server: free.avupda**********
Port: 80
Channel: #pg
Nickname: [P00|USA| %five-digit random character string%]
Password: d00l

Server: free.avupda**********
Port: 80
Channel: #pg
Nickname: [P00|USA| %five-digit random character string%]
Password: d00l

Server: free.updateav**********
Port: 80
Channel: #pg
Nickname: [P00|USA| %five-digit random character string%]
Password: d00l

Server: free.allavupdates.biz
Port: 80
Channel: #pg
Nickname: [P00|USA| %five-digit random character string%]
Password: d00l



 This malware has the ability to collect and send information such as:
    • CPU speed
     Details about drivers
    • Free disk space
    • Free memory
    • Malware uptime
    • 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:
    • Disable network shares
    • Edit registry
    • Enable network shares
    • Execute file
    • Kill process
    • Perform DDoS attack
     Perform network scan
     Register a service
    • Shut down system
     Start spreading routine
    • Terminate process
     Updates itself

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

 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.

說明撰寫者 Irina Boldea 開啟 2006年7月19日星期三
說明更新者 Irina Boldea 開啟 2006年7月19日星期三

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