Virus:Worm/Sdbot.129024.27
Date discovered:30/11/2006
Type:Worm
In the wild:No
Reported Infections:Low
Distribution Potential:Medium
Damage Potential:Low
Static file:Yes
File size:129.024 Bytes
MD5 checksum:f50ba23cf5bf5a3c0d65b28bdd346282
VDF version:6.35.01.99
IVDF version:6.35.01.100 - Wednesday, August 16, 2006

 General Method of propagation:
   • Local network


Aliases:
   •  Grisoft: IRC/BackDoor.SdBot2.GDM
   •  Eset: Win32/IRCBot.SW
   •  Bitdefender: Trojan.FirewallBypass


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


Side effects:
   • Blocks access to certain websites
   • Disable security applications
   • Lowers security settings
   • Registry modification
   • Makes use of software vulnerability
   • Third party control

 Files It copies itself to the following location:
   • %SYSDIR%\shoutcast.exe



It deletes the initially executed copy of itself.

 Registry The following registry key is added in order to run the process after reboot:

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices]
   • "SHOUTCAST for Windows NT"="shoutcast.exe"



The following registry key is continuously in an infinite loop added in order to run the process after reboot.

–  [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "SHOUTCAST for Windows NT"="shoutcast.exe"



It creates the following entry in order to bypass the Windows XP firewall:

– [HKLM\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\
   FirewallPolicy\StandardProfile\AuthorizedApplications\List]
   • "%SYSDIR%\shoutcast.exe"="%SYSDIR%\shoutcast.exe:*:Enabled:SHOUTCAST
      for Windows NT"



The following registry key is added:

– [HKLM\SOFTWARE\ProductName\ProductID]


The following registry keys are changed:

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

– [HKLM\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate]
   Old value:
   • "DoNotAllowXPSP2"=%user defined settings%
     "DoNotAllowXPSP3"=%user defined settings%
   New value:
   • "DoNotAllowXPSP2"=dword:00000001
     "DoNotAllowXPSP3"=dword:00000001

– [HKLM\SOFTWARE\Microsoft\security center]
   Old value:
   • "FirewallDisableNotify"=%user defined settings%
     "UpdatesDisableNotify"=%user defined settings%
     "AntiVirusDisableNotify"=%user defined settings%
     "AntiVirusOverride"=%user defined settings%
     "FirewallOverride"=%user defined settings%
   New value:
   • "FirewallDisableNotify"=dword:00000001
     "UpdatesDisableNotify"=dword:00000001
     "AntiVirusDisableNotify"=dword:00000001
     "AntiVirusOverride"=dword:00000001
     "FirewallOverride"=dword:00000001

 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:
   • C$
   • D$


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

–Cached usernames and passwords.

– A list of usernames and passwords:
   • www; windows; web; visitor; test2; test1; test; temp; telnet; ruler;
      remote; real; random; qwerty; public; pub; private; poiuytre;
      password; passwd; pass; oracle; one; nopass; nobody; nick; newpass;
      new; network; monitor; money; manager; mail; login; internet; install;
      hello; guest; free; demo; default; debug; database; crew; computer;
      coffee; bin; beta; backup; backdoor; anonymous; anon; alpha; adm;
      access; abc123; abc; system; sys; super; sql; shit; shadow; setup;
      security; secure; secret; 123456789; 12345678; 1234567; 123456; 12345;
      1234; 123; 00000000; 0000000; 000000; 00000; 0000; 000; server;
      administrateur; root; admin



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


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 Server:

Server: fbi32.cheapdf.**********
Port: 9568
Channel: #asn
Nickname: %Windows version%|USA|%two-digit random character string%
Password: owned



– This malware has the ability to collect and send information such as:
    • Current user
    • Information about the network


– Furthermore it has the ability to perform actions such as:
    • connect to IRC server
    • Launch DDoS SYN flood
    • Launch DDoS UDP flood
    • Disable network shares
    • Download file
    • Enable network shares
    • Join IRC channel
    • Perform network scan
    • Send emails
    • Updates itself
    • Visit a website

 Hosts The host file is modified as explained:

– In this case existing entries are deleted.

– Access to the following domains are redirected to other destinations:
   • www.virustotal.com
   • virusscan.jotti.org
   • sandbox.norman.no




The modified host file will look like this:


 Process termination List of processes that are terminated:
   • taskmgr.exe; process.exe; mmc.exe; regedit32.exe; regedit.exe;
      msconfig.exe; pccpfw.exe; kpf4gui.exe; fsguiexe.exe; efpeadm.exe;
      persfw.exe; zlclient.exe; Smc.exe; fsdfwd.exe; blackd.exe;
      MpfService.exe; nisum.exe; hijackthis.exe; MSASCui.exe; MsMpEng.exe;
      unregaaw.exe; blindman.exe; TeaTimer.exe; SpyCatcher.exe;
      swdoctor.exe; Tmas.exe; MssCli.exe; PPActiveDetection.exe;
      SpySweeper.exe; sunasServ.exe; Ad-Aware.exe; SpybotSD.exe;
      gcasServ.exe; Tmntsrv.exe; avgcc.exe; AVENGINE.EXE; ashAvast.exe;
      AVWIN.EXE; ntrtscan.exe; Mcshield.exe; fsav32.exe; AVKWCtl.exe;
      NAVAPSVC.exe


 Miscellaneous Mutex:


It creates one of the following Mutexes:
   • prison
   • owned

 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 the following runtime packer:
   • ENIGMA

Description inserted by Monica Ghitun on Thursday, November 30, 2006
Description updated by Monica Ghitun on Thursday, January 11, 2007

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