Threat Description

SdBot.vc

Details

Category: Malware
Platform: W32
Aliases: SdBot.vc, Backdoor.Win32.SdBot.vc, SDBot

Summary


SdBot represents the large family of backdoors - hacker's remote access tools. These tools allow to contol victims' computers remotely by sending specific commands via IRC channels. Also these backdoors can steal data, spread to local network and to computers vulnerable to exploits.



Removal


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More scanning & removal options

More information on scanning or removal options is available in the documentation for your F-Secure security product on the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for further assistance.

Network Disinfection

For general instructions on disinfecting a local network infection, please see Eliminating A Local Network Outbreak.

Manual Disinfection

Caution: Manual disinfection is a risky process; it is recommended only for advanced users.

Manual disinfection for SdBot.vc backdoor requires renaming of an infected file named WUPDATED.EXE located in Windows System folder and restarting a system.



Technical Details


The backdoor's file is a PE executable about 71 kilobytes long, packed with Exe32Pack file compressor. The backdoor contains the PSEXEC utility in its body.

When the backdoor's file is started, it copies itself as WUPDATED.EXE file to Windows System folder and then creates the following startup key value in the Registry:

  [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]  "Configuration Loaded"="WUPDATED.EXE"  

The backdoor can also create the following key value:

  [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices]  "Configuration Loaded"="WUPDATED.EXE"  

When the backdoor is active, it connects to an IRC server (on port 6667), joins a certain channel and acts as a bot there. The backdoor starts IDENTD server on port 113.

The backdoor tries to contact the following IRC servers:

  irc.undernet.org  kan3.de  

The backdoor joins the following password-protected IRC channels:

  #maerchenland  #kellyfamily  

Here's how the code of the backdoor looks in disassembler's window:

A hacker can send commands to the bots to control infected computers. A hacker can do any of the following:

  * perform ping, SYN, ICMP and UDP flood  * get system information including information about OS, network and drives  * update the backdoor's file from Internet  * operate backdoor's bot (nick change, join/part channels, etc.)  * redirect traffic on certain ports  * open a URL with default web browser  * steal CD keys from popular games  * spread to computers via LAN (performs dictionary attack on share passwords)  * join and spy on certain IRC channels  * start remote processes using PSEXEC.EXE utility (extracted from the backdoor)  * download and execute files  

SdBot.vc steals CD keys for the following games if they are installed on an infected computer:

  Half-Life  Unreal Tournament 2003  Counter-Strike (Retail)  Project IGI 2  Battlefield 1942  Battlefield 1942 Road To Rome  Rainbow Six III RavenShield  Neverwinter Knights  Soldier of Fortune 2  The Gladiators  Need for Speed Hot Persuit 2  FIFA 2003  Command & Conquer Generals  Red Alert 2  Tiberian Sun  





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