Virus:Worm/CodBot.19792
Date discovered:17/08/2005
Type:Worm
In the wild:No
Reported Infections:Low
Distribution Potential:Medium
Damage Potential:Medium
Static file:Yes
File size:19.456 Bytes
MD5 checksum:A99408E866C8115BC605C00446911017
VDF version:6.31.1.104

 General Method of propagation:
   • Local network


Aliases:
   •  Symantec: W32.Toxbot
   •  Mcafee: Exploit-Lsass.gen
   •  Kaspersky: Backdoor.Win32.Codbot.am
   •  TrendMicro: WORM_TOXBOT.B
   •  VirusBuster: Worm.Codbot.Gen.2
   •  Bitdefender: GenPack:Backdoor.SDBot.F12601F2


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


Side effects:
   • Steals information
   • Third party control

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



It deletes the initially executed copy of itself.

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

– [HKLM\SYSTEM\CurrentControlSet\Services\Rpcmon]
   • "Type"=dword:00000110
   • "Start"=dword:00000002
   • "ErrorControl"=dword:00000000
   • "ImagePath"="%SYSDIR%\rpcmon.exe"
   • "DisplayName"="Remote Procedure Call (RPC) Monitoring"
   • "ObjectName"="LocalSystem"
   • "FailureActions"=%hex numbers%
   • "Description"="Monitoring the end point mapper and other RPC services."

– [HKLM\SYSTEM\CurrentControlSet\Services\Rpcmon\Security]
   • "Security"=%hex numbers%



The following registry keys are added:

– [HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot\Minimal\Rpcmon]
   • @="Service"

– [HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot\Network\Rpcmon]
   • @="Service"

 Network Infection In order to ensure its propagation the malware attemps to connect to other machines as described below.


Exploit:
It makes use of the following Exploits:
– MS02-061 (Elevation of Privilege in SQL Server Web)
– MS03-026 (Buffer Overrun in RPC Interface)
– MS03-039 (Buffer Overrun in RPCSS Service)
– MS03-049 (Buffer Overrun in the Workstation Service)
– MS04-011 (LSASS Vulnerability)


Infection process:
Creates an FTP script on the compromised machine in order to download the malware to the remote location.

 IRC To deliver system information and to provide remote control it connects to the following IRC Servers:

Server: 0x80.online-**********.org
Port: 1023, 6556
Channel: #15#
Nickname: %random character string%
Password: g3t0u7

Server: 0x80.going<.MASK>formars.com
Port: 1023, 6556
Channel: #15#
Nickname: %random character string%
Password: g3t0u7

Server: 0x80.my**********.com
Port: 1023, 6556
Channel: #15#
Nickname: %random character string%
Password: g3t0u7

Server: 0x80.**********-secure.name
Port: 1023, 6556
Channel: #15#
Nickname: %random character string%
Password: g3t0u7

Server: 0xff.**********zero.info
Port: 1023, 6556
Channel: #15#
Nickname: %random character string%
Password: g3t0u7

Server: 0x80.martian**********.com
Port: 1023, 6556
Channel: #15#
Nickname: %random character string%
Password: g3t0u7



– This malware has the ability to collect and send information such as:
    • CPU speed
    • Malware uptime
    • Information about the network
    • Size of memory


– Furthermore it has the ability to perform actions such as:
    • Download file
    • Execute file

 Backdoor The following ports are opened:

– %SYSDIR%\rpcmon.exe on UDP port 69 in order to provide a TFTP server.
– %SYSDIR%\rpcmon.exe on a random TCP port in order to provide an FTP server.
– %SYSDIR%\rpcmon.exe on a random TCP port in order to provide backdoor capabilities.

 Stealing It tries to steal the following information:

– A logging routine is started after the following website is visited, which contains one of the following substrings in the URL:
   • "e-gold"
   • "egold"
   • "bank"
   • "login"
   • "e-bay"
   • "ebay"
   • "paypal"

– It captures:
    • Keystrokes
    • Window information

 Miscellaneous Mutex:
It creates the following Mutex:
   • XRpCMoNx

 File details Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

Description inserted by Andrei Gherman on Wednesday, August 17, 2005
Description updated by Andrei Gherman on Wednesday, August 8, 2007

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