Virus:Worm/IrcBot.530944
Date discovered:28/02/2009
Type:Worm
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low to medium
Damage Potential:Medium
Static file:Yes
File size:530.944 Bytes
MD5 checksum:a2eaf57c47a118e91a5edf694685eee7
IVDF version:7.01.02.96 - Saturday, February 28, 2009

 General Methods of propagation:
   • Autorun feature
   • Local network
   • Messenger


Aliases:
   •  Mcafee: W32/Spybot.worm.gen
   •  Sophos: Mal/Generic-A
   •  Panda: W32/IRCBot.CKA.worm
   •  Eset: Win32/Boberog.K
   •  Bitdefender: Trojan.Generic.1724469


Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003


Side effects:
   • Drops malicious files
   • Registry modification
   • Third party control

 Files It copies itself to the following locations:
   • %SYSDIR%\wmisys.exe
   • %drive%\RECYCLER\%CLSID%\autorun.exe



The following files are created:

– %drive%\RECYCLER\%CLSID%\Desktop.ini
– %drive%\autorun.inf This is a non malicious text file with the following content:
   • %code that runs malware%

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

– [HKLM\SYSTEM\CurrentControlSet\Services\WMISYS]
   • "Description"="Spools WMI applications."
   • "DisplayName"="WMI System App"
   • "ErrorControl"=dword:0x00000000
   • "FailureActions"=hex:0A,00,00,00,00,00,00,00,00,00,00,00,01,00,00,00,65,00,6D,00,01,00,00,00,B8,0B,00,00
   • "ImagePath"=""%SYSDIR%\wmisys.exe""
   • "ObjectName"="LocalSystem"
   • "Start"=dword:0x00000002
   • "Type"=dword:0x00000110



The following registry keys are changed:

– [HKLM\SYSTEM\CurrentControlSet\Control]
   New value:
   • "WaitToKillServiceTimeout"="7000"

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Shell Extensions]
   New value:
   • "GON"="%executed file%"

 Messenger It is spreading via Messenger. The characteristics are described below:

– AIM Messenger
– MSN Messenger

The URL then refers to a copy of the described malware. If the user downloads and executes this file the infection process will start again.

 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:
– MS04-007 (ASN.1 Vulnerability)
– MS06-040 (Vulnerability in Server Service)


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 Servers:

Server: schima.ch**********.info
Port: 8083
Channel: #sploit
Nickname: [00|USA|XP|%number%]

Server: cornea.ch**********.info

Server: sin.nk**********.info

Server: descent.ne**********.info

Server: design.nk**********.info

Server: argv.ne**********.info

Server: mute.nk**********.info

Server: system.cit**********.info

Server: load.nk**********.info

Server: core.ci**********.info

 Backdoor The following port is opened:
on TCP port 27282 in order to provide an HTTP server.

 Miscellaneous Anti debugging
It checks if one of the following files are present:
   • \\.\SICE
   • \\.\NTICE


 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 Petre Galan on Friday, March 5, 2010
Description updated by Petre Galan on Friday, March 5, 2010

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