Virus:Worm/VanBot.ay
Date discovered:13/03/2007
Type:Worm
In the wild:No
Reported Infections:Low
Distribution Potential:Medium
Damage Potential:Medium
Static file:Yes
File size:161.792 Bytes
MD5 checksum:d1923c613668592b0f579d96db21b738
VDF version:6.38.00.43
IVDF version:6.38.00.44 - Tuesday, March 13, 2007

 General Method of propagation:
   • Local network


Aliases:
   •  Kaspersky: Backdoor.Win32.VanBot.ay
   •  F-Secure: Backdoor.Win32.VanBot.ay
   •  Eset: Win32/Poebot


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


Side effects:
   • Drops a file
   • Records keystrokes
   • Registry modification
   • Steals information
   • Third party control

 Files It drops a copy of itself using a filename from a list:
– To: %SYSDIR%\ Using one of the following names:
   • csrs.exe
   • logon.exe
   • explorer.exe
   • supoolsvc.exe
   • lsass.exe
   • algs.exe
   • iexplore.exe
   • winamp.exe
   • firewall.exe
   • lssas.exe
   • winIogon.exe
   • spooIsv.exe
   • spoolsvc.exe




It deletes the initially executed copy of itself.



The following file is created:

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

 Registry One of the following values is added in order to run the process after reboot:

–  [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "Client Server Runtime Process"="%SYSDIR%\csrs.exe"
   • "Windows Logon Application"="%SYSDIR%\logon.exe"
   • "Windows Explorer"="%SYSDIR%\explorer.exe"
   • "Spooler SubSystem App"="%SYSDIR%\supoolsvc.exe"
   • "Local Security Authority Service"="%SYSDIR%\lsass.exe"
   • "Application Layer Gateway Service"="%SYSDIR%\algs.exe"
   • "Microsoft Internet Explorer"="%SYSDIR%\iexplore.exe"
   • "Winamp Agent"="%SYSDIR%\winamp.exe"
   • "Windows Network Firewall"="%SYSDIR%\firewall.exe
   • "Local Security Authority Service"="%SYSDIR%\lssas.exe"
   • "Windows Logon Application"="%SYSDIR%\winIogon.exe"
   • "Spooler SubSystem App"="%SYSDIR%\spooIsvc.exe"
   • "Spooler SubSystem App"="%SYSDIR%\spoolsvc.exe"

 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:
   • IPC$
   • print$
   • C$\Documents and Settings\All Users\Documents\$
   • admin$
   • Admin$\system32
   • c$\windows\system32
   • c$\winnt\system32
   • c$\windows
   • c$\winnt
   • e$\shared
   • d$\shared
   • c$\shared


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

– The following list of usernames:
   • staff; teacher; owner; student; intranet; lan; main; office; control;
      siemens; compaq; dell; cisco; ibm; oracle; sql; data; access;
      database; domain; god; backup; technical; mary; katie; kate; george;
      eric; none; guest; chris; ian; neil; lee; brian; susan; sue; sam;
      luke; peter; john; mike; bill; fred; joe; jen; bob; wwwadmin; oemuser;
      user; homeuser; home; internet; www; web; root; server; linux; unix;
      computer; adm; admin; admins; administrat; administrateur;
      administrador; administrator

– The following list of passwords:
   • winpass; blank; nokia; orainstall; sqlpassoainstall; db1234; db2; db1;
      databasepassword; databasepass; dbpassword; dbpass; domainpassword;
      domainpass; hello; hell; love; money; slut; bitch; fuck; exchange;
      loginpass; login; qwe; zxc; asd; qaz; win2000; winnt; winxp; win2k;
      win98; windows; oeminstall; oem; accounting; accounts; letmein; sex;
      outlook; mail; qwerty; temp123; temp; null; default; changeme; demo;
      test; 2005; 2004; 2001; secret; payday; deadline; work; 1234567890;
      123456789; 12345678; 1234567; 123456; 12345; 1234; 123; 007; pwd;
      pass; pass1234; dba; passwd; password; password1; abc



Exploit:
It makes use of the following Exploits:
– MS03-026 (Buffer Overrun in RPC Interface)
– MS03-049 (Buffer Overrun in the Workstation Service)
– MS04-011 (LSASS Vulnerability)
– MS05-039 (Vulnerability in Plug and Play)


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: l33.ko0ppol.**********
Port: 4545
Channel: #nerds#
Nickname: %random character string%

Server: a11.je34ke5.**********
Port: 8585
Channel: #nerds#
Nickname: %random character string%



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


– Furthermore it has the ability to perform actions such as:
    • Launch DDoS SYN flood
    • Download file
    • Perform network scan

 Stealing It tries to steal the following information:
– Recorded passwords used by the AutoComplete function

– The following CD keys:
   • World Of Warcraft
   • Unreal3
   • Steam
   • Conquer Online

– Passwords from the following programs:
   • FlashFXP
   • MSN
   • OutlookExpress

– A logging routine is started after keystrokes are typed that match one of the following strings:
   • paypal; cd key; cd-key; cdkey; passwort; auth; sxt; login; pw=; pass=;
      login=; password=; username=; passwd=; :auth; identify; oper;
      MailPass; pass; unknown; user

– It captures:
    • Keystrokes

– A logging routine is started after a website is visited, which contains the following substring in its URL:
   • paypal.com

– It captures:
    • Login information

 Miscellaneous Mutex:
It creates the following Mutex:
   • cd9f82a30d4ee5d683ae1fc7575b139ab344

 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 Monday, March 12, 2007
Description updated by Adriana Popa on Friday, March 16, 2007

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