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F-Secure Virus Information Pages: SdBot.aay
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Summary
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SdBot represents the large family of backdoors - hacker's remote
access tools. These tools allow to control victims' computers
remotely by sending specific commands via IRC channels. Also,
these backdoors can steal data and spread to computers vulnerable
to exploits.
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Detailed Description
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The backdoor's file is a PE executable about 210 kilobytes long, packed with SVPK file compressor.
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:
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
"Shell" = "Explorer.exe mssvces.exe"
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 is used by the backdoor:
- asnpwnz12345.server.us:7645
- asnpwnz12345.server.us:95644
The backdoor joins the following password-protected IRC channel:
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
When spreading, the bot can exploit the following vulnerabilities:
- * LSASS (MS04-011) port 445
- * WKSSVC (MS03-049) port 445
- * ASN.1 (MS04-007) ports 80, 139, 445
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F-Secure Corporation |
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Last Modified: January 01, 2006
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