Virus:Worm/IrcBot.ljo
Date discovered:08/07/2010
Type:Worm
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Medium
Static file:Yes
File size:29.696 Bytes
MD5 checksum:893d489a899af1d559eefaca63ea01b9
IVDF version:7.10.09.47 - Thursday, July 8, 2010

 General Methods of propagation:
   • Autorun feature
   • Local network


Aliases:
   •  Sophos: Mal/IRCBot-B
   •  Bitdefender: Backdoor.SDBot.DGFQ
   •  Eset: Win32/AutoRun.IRCBot.FC


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


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

 Files It copies itself to the following locations:
   • %drive%\autorunme.exe
   • %SYSDIR%\lunchers.exe



The following file is created:

– %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:

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Shell Extensions]
   • "systemxstuff"="%executed file%"

 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)
– MS03-039 (Buffer Overrun in RPCSS Service)
– MS04-007 (ASN.1 Vulnerability)
– MS06-040 (Vulnerability in Server Service)


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.


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: wff.wel**********.info
Port: 7000
Channel: #tv#
Nickname: [00|USA|XP|%number%]

 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 Tuesday, August 10, 2010
Description updated by Petre Galan on Tuesday, August 10, 2010

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