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Virus:Worm/SdBot.akv
Date discovered:17/11/2005
Type:Worm
In the wild:No
Reported Infections:Low
Distribution Potential:Medium
Damage Potential:Medium
Static file:Yes
File size:76.800 Bytes
MD5 checksum:e4c3dcd460c2e4c898c65a59161c2d80
VDF version:6.36.01.45
IVDF version:6.36.01.48 - Friday, November 17, 2006

 General Method of propagation:
   • Local network


Aliases:
   •  Kaspersky: Backdoor.Win32.SdBot.avd
   •  TrendMicro: WORM_SDBOT.ALQ
   •  Sophos: W32/Tilebot-HH

It was previously detected as:
     TR/Packed.CryptExe


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


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

 Files It copies itself to the following location:
   • %SYSDIR%\lsyss.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\Windows Reg Service
   • "Type"=dword:00000110
   • "Start"=dword:00000002
   • "ErrorControl"=dword:00000000
   • "ImagePath"="%SYSDIR%\lsyss.exe"
   • "DisplayName"="Windows Reg Service"
   • "ObjectName"="LocalSystem"
   • "FailureActions"=%hex value%
   • "Description"="Windows Reg Service"



The values of the following registry keys are removed:

–  HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Shell Extensions
   • "jda30"=%executed file%

–  HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\
   ProxyEnable
–  HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\
   ProxyServer
–  HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\
   ProxyOverride
–  HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\
   AutoConfigURL


The following registry keys are added:

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Shell Extensions
   • "jda30"=%executed file%

HKLM\SYSTEM\CurrentControlSet\Services\Windows Reg Service\Security
   • "Security"=%hex value%

HKLM\SYSTEM\CurrentControlSet\Services\Windows Reg Service\Enum
   • "0"="Root\\LEGACY_WINDOWS_REG_SERVICE\\0000"
   • "Count"=dword:00000001
   • "NextInstance"=dword:00000001

HKLM\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_WINDOWS_REG_SERVICE
   • "NextInstance"=dword:00000001

HKLM\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_WINDOWS_REG_SERVICE\
   0000
   • "Service"="Windows Reg Service"
   • "Legacy"=dword:00000001
   • "ConfigFlags"=dword:00000000
   • "Class"="LegacyDriver"
   • "ClassGUID"="{8ECC055D-047F-11D1-A537-0000F8753ED1}"
   • "DeviceDesc"="Windows Reg Service"

HKLM\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_WINDOWS_REG_SERVICE\
   0000\Control
   • "*NewlyCreated*"=dword:00000000
   • "ActiveService"="Windows Reg Service"

HKLM\SOFTWARE\Microsoft\Security Center
   • "UpdatesDisableNotify"=dword:00000001
   • "AntiVirusDisableNotify"=dword:00000001
   • "FirewallDisableNotify"=dword:00000001
   • "AntiVirusOverride"=dword:00000001
   • "FirewallOverride"=dword:00000001

HKLM\SOFTWARE\Policies\Microsoft\WindowsFirewall\DomainProfile
   • "EnableFirewall"=dword:00000000

HKLM\SOFTWARE\Policies\Microsoft\WindowsFirewall\StandardProfile
   • "EnableFirewall"=dword:00000000

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\
   Auto Update
   • "AUOptions"=dword:00000001

HKLM\SYSTEM\CurrentControlSet\Services\wscsvc
   • "Start"=dword:00000004

HKLM\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters
   • "AutoShareWks"=dword:00000000
   • "AutoShareServer"=dword:00000000

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

HKLM\SYSTEM\CurrentControlSet\Services\TlntSvr
   • "Start"=dword:00000004

HKLM\SYSTEM\CurrentControlSet\Services\RemoteRegistry
   • "Start"=dword:00000004

HKLM\SYSTEM\CurrentControlSet\Services\Messenger
   • "Start"=dword:00000004



The following registry keys are changed:

HKLM\SYSTEM\CurrentControlSet\Control
   Old value:
   • "WaitToKillServiceTimeout"="2000"
   New value:
   • "WaitToKillServiceTimeout"="7000"

HKLM\SYSTEM\CurrentControlSet\Control\Lsa
   Old value:
   • "restrictanonymous"=dword:00000000
   New value:
   • "restrictanonymous"=dword:00000001

HKLM\SOFTWARE\Microsoft\Ole
   Old value:
   • "EnableDCOM"="Y"
   New value:
   • "EnableDCOM"="N"

 Network Infection Exploit:
It makes use of the following Exploits:
– MS03-026 (Buffer Overrun in RPC Interface)
– MS03-039 (Buffer Overrun in RPCSS Service)
– MS04-007 (ASN.1 Vulnerability)
– MS04-011 (LSASS Vulnerability)
– MS05-039 (Vulnerability in Plug and Play)


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: x.realdot**********
Port: 8080
Server password: master
Channel: #4.
Nickname: [P00|USA|%five-digit random character string%]
Password: .....



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


 Furthermore it has the ability to perform actions such as:
    • Disable network shares
    • Download file
    • Edit registry
    • Enable network shares
    • Kill process
    • Open remote shell
     Perform network scan
    • Shut down system
    • Terminate malware

 Process termination List of processes that are terminated:
   • i11r54n4.exe; rate.exe; winsys.exe; irun4.exe; bbeagle.exe;
      d3dupdate.exe; teekids.exe; Penis32.exe; MSBLAST.exe;
      PandaAVEngine.exe; mscvb32.exe; ssate.exe; sysinfo.exe


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

Description inserted by Bogdan Iliuta on Friday, November 17, 2006
Description updated by Bogdan Iliuta on Monday, November 20, 2006

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