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Virus:Worm/SdBot.aad.373
Date discovered:04/01/2006
Type:Worm
In the wild:Yes
Reported Infections:Low
Distribution Potential:Medium
Damage Potential:Medium
Static file:Yes
File size:65.024 Bytes
MD5 checksum:7eac026af1b7f20F52765af44e0926d8
VDF version:6.33.00.96

 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:
   • Drops a malicious file
   • Lowers security settings
   • Registry modification
   • Makes use of software vulnerability
   • Third party control

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



The following file is created:

%SYSDIR%\remon.sys Further investigation pointed out that this file is malware, too. Detected as: Tr/Rootkit.Agent.AB

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

[HKLM\SYSTEM\CurrentControlSet\Services\nvidGUIv2]
   • "Type"=dword:00000110
   • "Start"=dword:00000002
   • "ErrorControl"=dword:00000000
   • "ImagePath"="%WINDIR%\nvidGUIv.exe"
   • "DisplayName"="nvidGUIv"
   • "ObjectName"="LocalSystem"
   • "FailureActions"=%hex values%
   • "Description"="Manages Video devices for Windows-based "



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:
   • D$\Windows\System32
   • C$\Winnt\System32
   • ADMIN$\System32
   • ADMIN$
   • 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: http.**********servers.net
Port: 5552
Channel: #vec
Nickname: [P00|USA| %five-digit random character string%]
Password: #vece

Server: http.**********0rder.com
Port: 6556
Channel: #vec
Nickname: [P00|USA| %five-digit random character string%]
Password: #vece



 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:
     Launch DDoS ICMP flood
     Launch DDoS SYN flood
     Launch DDoS UDP flood
    • Disable network shares
    • Download file
    • 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
    • Upload file
     Visit a website

 Process termination It tries to terminate the following processes and delete the corresponding files:
   • i11r54n4.exe; rate.exe; winsys.exe; irun4.exe; bbeagle.exe;
      d3dupdate.exe; teekids.exe; Penis32.exe; MSBLAST.exe;
      PandaAVEngine.exe; taskmon.exe; mscvb32.exe; ssate.exe; sysinfo.exe


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

 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/**********

As a result it may send some information. This is done via the HTTP GET request on a CGI script.

 Miscellaneous Mutex:
It creates the following Mutex:
   • Add3ZA1M

 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 Tuesday, September 26, 2006
Description updated by Irina Boldea on Wednesday, October 11, 2006

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