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Virus:Worm/Sdbot.53675.7
Type:Worm
In the wild:Yes
Reported Infections:Low
Distribution Potential:Medium
Damage Potential:Medium
Static file:Yes
File size:53.675 Bytes
MD5 checksum:a86b3f776bd1128c7fe8d4ec7dab9ba2
VDF version:6.36.00.213
IVDF version:6.36.00.237 - Sunday, November 5, 2006

 General Method of propagation:
   • Local network


Aliases:
   •  Kaspersky: Backdoor.Win32.SdBot.aad
   •  Sophos: W32/Tilebot-HW
   •  VirusBuster: Worm.SdBot.EKM
   •  Eset: IRC/SdBot
   •  Bitdefender: Backdoor.Sdbot.J


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


Side effects:
   • Drops a malicious file
   • Registry modification
   • Makes use of software vulnerability
   • Third party control

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



It renames the following file:

    •  %SYSDIR%\sfc_os.dll into %SYSDIR%\trash%five-digit random character string%



It deletes the initially executed copy of itself.



The following file is created:

%SYSDIR%\sfc_os.dll Further investigation pointed out that this file is malware, too. Detected as: TR/Sfc.A.mod

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

– HKLM\SYSTEM\CurrentControlSet\Services\LSA Shel (Export Version)
   • "Type"=dword:00000110
   • "Start"=dword:00000002
   • "ErrorControl"=dword:00000000
   • "ImagePath"="%WINDIR%\lsass.exe"
   • "DisplayName"="LSA Shel (Export Version)"
   • "ObjectName"="LocalSystem"
   • "FailureActions"=%hex values%
   • "Description"="LSA Shel (Export Version)"



The following registry keys are added:

– HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Shell Extensions
   • "p3g9s4o2h8v1"="%current date%"

– HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
   • "SFCScan"=dword:00000000
   • "SFCDisable"=dword:ffffff9d

 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$\windows\system32c$\
   • d$\winnt\system32
   • c$\windows\system32
   • c$\winnt\system32
   • Admin$\system32
   • Admin$


Exploit:
It makes use of the following Exploits:
– MS02-061 (Elevation of Privilege in SQL Server Web)
– MS04-007 (ASN.1 Vulnerability)
– MS06-040 (Vulnerability in Server Service)


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: mail.telon-**********
Port: 7412
Channel: #
Nickname: [P00|USA| %eight-digit random character string%]

Server: http.an1mal**********
Port: 9632
Channel: #
Nickname: [P00|USA| %eight-digit random character string%]



– This malware has the ability to collect and send information such as:
    • Collected Email addresses
    • CPU speed
    • Details about drivers
    • Free disk space
    • Free memory
    • 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
    • disconnect from IRC server
    • Download file
    • Edit registry
    • Enable network shares
    • Execute file
    • Join IRC channel
    • Kill process
    • Leave IRC channel
    • Open remote shell
    • Perform network scan
    • Register a service
    • Terminate process

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


 Backdoor Contact server:
All of the following:
   • http://www2.dokidoki.ne.jp/tomocrus/cgi-bin/check**********
   • http://www.kinchan.net/cgi-bin/**********
   • http://www.pistarnow.is.net.pl/**********
   • http://cgi.break.power.ne.jp/check/**********
   • http://www.proxy4free.info/cgi-bin/**********
   • http://69.59.137.236/cgi/**********
   • http://tutanchamon.ovh.org/**********
   • http://www.proxy.us.pl/**********
   • http://test.anonproxies.com/**********
   • http://www.nassc.com/**********
   • http://www.littleworld.pe.kr/**********
   • http://www.anonymitytest.com/cgi-bin/**********
   • http://tn0828-web.hp.infoseek.co.jp/cgi-bin/**********


 Miscellaneous Mutex:
It creates the following Mutex:
   • 9lcgm4w6f8

 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, January 30, 2007
Description updated by Irina Boldea on Wednesday, January 31, 2007

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