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Date discovered:14/07/2005
In the wild:Yes
Reported Infections:Low
Distribution Potential:Medium
Damage Potential:Medium
Static file:Yes
File size:38.400 Bytes
MD5 checksum:4a31bef1e822492e42b789ab4400f387
VDF version:

 General Method of propagation:
   • Local network

   •  Symantec: W32.IRCBot
   •  Kaspersky: Backdoor.Win32.SdBot.abf
   •  TrendMicro: WORM_SDBOT.BRP
   •  Sophos: W32/Sdbot-Fam
   •  Grisoft: IRC/BackDoor.SdBot.DWM
   •  VirusBuster: Worm.SdBot.BAI
   •  Eset: IRC/SdBot
   •  Bitdefender: Backdoor.SDBot.ABF

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

Side effects:
   • Registry modification
   • Makes use of software vulnerability
   • Third party control

 Files It copies itself to the following location:
   • %SYSDIR%\%seven-digit random character string%.exe

It deletes the initially executed copy of itself.

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

– HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
   • "duweculey"="%seven-digit random character string%.exe"

– HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
   • "duweculey"="%seven-digit random character string%.exe"

– HKCU\Software\Microsoft\Windows\CurrentVersion\Run
   • "duweculey"="%seven-digit random character string%.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$
   • C$\Documents and Settings\All Users\Documents\
   • C$\shared
   • C$\windows\system32
   • c$\winnt\system32
   • ADMIN$\system32\

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

– A list of usernames and passwords:
   • 123qwe123; zaqxsw; zaq123; motdepass; fuckyou; billgate; billgates;
      fred; bill; intranet; staff; teacher; student1; student; user1; afro;
      turnip; glen; freddy; internet; lan; nokia; ctx; 666; qweasdzxc;
      zxcvbnm; 123qaz; 123qwe; qwe123; qazwsx; qweasd; zxc123; pass1234;
      pwd; pass; passwd; admin; administrador; administrateur; administrator

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:

Port: 9000
Channel: #aa
Nickname: J%five-digit random character string%

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

 Miscellaneous Mutex:
It creates the following Mutex:
   • savum

 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 Irina Boldea on Thursday, May 11, 2006
Description updated by Irina Boldea on Thursday, May 11, 2006

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