Threat Description

Backdoor:​W32/SdBot.AAY

Details

Aliases:Backdoor.Win32.SdBot.aay
Category:Malware
Type:Backdoor
Platform:W32

Summary



A remote administration utility which bypasses normal security mechanisms to secretly control a program, computer or network.



Removal


Automatic action

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

More

You may wish to refer to the Support Community for further assistance. You also may also refer to General Removal Instructions for a general guide on alternative disinfection actions.



Technical Details



Backdoor:W32/SdBot.AAY spreads by exploiting a variety of vulnerabilities and can be controlled by a remote attacker through a password-protected IRC channel.The backdoor's file is a PE executable about 210 kilobytes long, packed with SVPK file compressor.

Infection

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

  • "Shell" = "Explorer.exe mssvces.exe"

Propagation

The bot exploits the following vulnerabilities in order to spread:

  • LSASS (MS04-011) port 445
  • WKSSVC (MS03-049) port 445
  • ASN.1 (MS04-007) ports 80, 139, 445

Activity

When the backdoor is active, it connects to an IRC server, joins a certain channel and acts as a bot there. The backdoor also starts IDENTD server on port 113. The following IRC server and ports are used by the backdoor:

  • asnpwnz12345.server.us:7645
  • asnpwnz12345.server.us:95644

The backdoor joins the following password-protected IRC channel:

  • #asnpwn

A hacker can send commands to the bots to control infected computers. Several tasks can be performed, including the following:

  • start FTP server
  • 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
  • join and spy on certain IRC channels
  • download and execute files
  • manipulate Internet Explorer zone settings
  • scan and exploit computers vulnerable to exploits





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