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.
Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.
For general instructions on disinfecting a local network infection, please see Eliminating A Local Network Outbreak.
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.
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:
The backdoor joins the following password-protected IRC channels:
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