Virus:Worm/Sdbot.63532
Date discovered:12/09/2006
Type:Worm
In the wild:No
Reported Infections:Low
Distribution Potential:Medium
Damage Potential:Medium
Static file:Yes
File size:63.532 Bytes
MD5 checksum:839ed2ee0a78543a78ab82cd0b346830
VDF version:6.35.01.215
IVDF version:6.35.01.219 - Wednesday, September 13, 2006

 General Method of propagation:
   • Local network


Aliases:
   •  Kaspersky: Backdoor.Win32.SdBot.auv
   •  TrendMicro: WORM_SDBOT.BW
   •  F-Secure: Backdoor.Win32.SdBot.auv
   •  Grisoft: IRC/BackDoor.SdBot2.HXT
   •  Eset: IRC/SdBot


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


Side effects:
   • Disable security applications
   • Drops a file
   • Lowers security settings
   • Registry modification
   • Third party control

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



It deletes the initially executed copy of itself.



The following file is created:

– %malware execution directory%\removeMe%four-digit random character string%.bat Furthermore it gets executed after it was fully created. This batch file is used to delete a file.

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

– [HKLM\SYSTEM\CurrentControlSet\Services\msvbn]
   • "Type"=dword:00000110
   • "Start"=dword:00000002
   • "ErrorControl"=dword:00000000
   • "ImagePath"="%WINDIR%\msvbn.exe"
   • "DisplayName"="msvbn"
   • "ObjectName"="LocalSystem"
   • "FailureActions"=%hex values%
   • "Description"="Aol Software v9"

– [HKLM\SYSTEM\CurrentControlSet\Services\msvbn\Security]
   • "Security"=%hex values%

– [HKLM\SYSTEM\CurrentControlSet\Services\msvbn\Enum]
   • "0"="Root\\LEGACY_MSVBN\\0000"
   • "Count"=dword:00000001
   • "NextInstance"=dword:00000001



The following registry keys are changed:

– [HKLM\SYSTEM\CurrentControlSet\Control]
   Old value:
   • "WaitToKillServiceTimeout"="20000"
   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

– [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:
   • "AUState"=dword:00000007
   • "AUOptions"=dword:00000001
   New value:
   • "AUState"=dword:00000001
   • "AUOptions"=dword:00000001

– [HKLM\SYSTEM\CurrentControlSet\Services\TlntSvr]
   Old value:
   • "Start"=%user defined settings%
   New value:
   • "Start"=dword:00000004

– [HKLM\SYSTEM\CurrentControlSet\Services\wscsvc]
   Old value:
   • "Start"=%user defined settings%
   New value:
   • "Start"=dword:00000004

– [HKLM\SYSTEM\CurrentControlSet\Services\RemoteRegistry]
   Old value:
   • "Start"=%user defined settings%
   New value:
   • "Start"=dword:00000004

– [HKLM\SYSTEM\CurrentControlSet\Services\Messenger]
   Old value:
   • "Start"=%user defined settings%
   New value:
   • "Start"=dword:00000004

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

– [HKLM\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters]
   New value:
   • "AutoShareWks"=dword:00000000
   • "AutoShareServer"=dword:00000000

– [HKLM\SYSTEM\CurrentControlSet\Services\lanmanworkstation\
   parameters]
   New value:
   • "AutoShareWks"=dword:00000000
   • "AutoShareServer"=dword:00000000

– [HKLM\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate]
   Old value:
   • "DoNotAllowXPSP2"=%user defined settings%
   New value:
   • "DoNotAllowXPSP2"=dword:00000001

– [HKLM\SOFTWARE\Microsoft\Ole]
   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:
   • Z$
   • Y$
   • X$
   • W$
   • V$
   • U$
   • T$
   • S$
   • R$
   • Q$
   • P$
   • O$
   • N$
   • M$
   • L$
   • K$
   • J$
   • I$
   • H$
   • G$
   • F$
   • E$
   • D$
   • C$
   • ADMIN$
   • IPC$


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

– 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:
– 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 octet from its own address. Afterwards it tries to establish a connection with the created addresses.


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: kirsty.4n4rchy99.**********
Port: 61521
Channel: #q3
Nickname: [P00|USA|%five-digit random character string%]
Password: deddyman



– This malware has the ability to collect and send information such as:
    • CPU speed
    • Current user
    • Details about drivers
    • Free disk space
    • Free memory
    • Malware uptime
    • Information about the network
    • Size of memory
    • Username


– Furthermore it has the ability to perform actions such as:
    • connect to IRC server
    • Launch DDoS TCP flood
    • Launch DDoS UDP flood
    • Disable network shares
    • disconnect from IRC server
    • Download file
    • Edit registry
    • Enable network shares
    • Execute file
    • Kill process
    • Open remote shell
    • Perform DDoS attack
    • Perform network scan
    • Perform port redirection
    • Updates itself

 Process termination  List of services that are disabled:
   • Security Center
   • Windows Firewall/ICS
   • Remote Registry
   • Telnet
   • wscsvc
   • SharedAccess
   • Messenger
   • RemoteRegistry
   • Tlntsvr

 Backdoor Contact server:
The following:
   • http://www.4n4rchy99.info/**********

As a result it may send some information.

 Miscellaneous Mutex:
It creates the following Mutex:
   • 0x3mut3d010

 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 Adriana Popa on Tuesday, October 24, 2006
Description updated by Adriana Popa on Tuesday, October 24, 2006

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