Virus:Worm/IrcBot.164961
Date discovered:17/02/2010
Type:Worm
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Medium
Damage Potential:Medium
Static file:Yes
File size:164.961 Bytes
MD5 checksum:46e08081b696370727025779742237fd
IVDF version:7.10.04.80 - Wednesday, February 17, 2010

 General Methods of propagation:
   • Autorun feature
   • Local network


Aliases:
   •  Bitdefender: Backdoor.SDBot.DGFO
   •  Eset: Win32/AutoRun.Agent.RF


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:
   • %WINDIR%\sysdiag64.exe
   • %drive%\autorun.exe



The following files are created:

– %drive%\auTORUN.inf This is a non malicious text file with the following content:
   • %code that runs malware%

– %SYSDIR%\DROPPEDFILEOK.tmp



It tries to executes the following file:

– Filename:
   • "%WINDIR%\sysdiag64.exe"

 Registry The following registry keys are added in order to run the processes after reboot:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "sysdiag64.exe"="%WINDIR%\sysdiag64.exe"

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "MicrosoftNAPC"="%WINDIR%\sysdiag64.exe"

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\
   Run]
   • "MicrosoftCorp"="%WINDIR%\sysdiag64.exe"

–  [HKLM\SOFTWARE\Microsoft\PCHealth\ErrorReporting\DW]
   • DWFileTreeRoot

 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:
– 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.

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

Server: vte**********.info
Port: 51987
Channel: #pwn
Nickname: TsGh{USA-XP}%number%

 Injection – It injects itself as a remote thread into a process.

    Process name:
   • %random%


 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 Thursday, August 12, 2010

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