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Tuesday, 11 January 2005 |
Backdoor.Sdbot.AJ is a network-aware worm with back door capabilities that spreads via network shares and allows a remote attacker to gain unauthorized access to the compromised computer.
When executed, it performs the following actions:
Creates the following files:
%System%msnmessenger.exe
msnconfig.dat (created in the directory the original file was executed from)
Note: %System% is a variable that refers to the System folder. By default this is C:WindowsSystem (Windows 95/98/Me), C:WinntSystem32 (Windows NT/2000), or C:WindowsSystem32 (Windows XP).
Adds the value:
"Microsoft Windows Update" = "msnmessenger.exe"
to the registry keys:
HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurrentVersionRun
HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurrentVersionRunServices
HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionRun
so that it is executed every time Windows starts.
Opens a back door on the compromised system by connecting to an IRC server through TCP port 59 on the domain moskemongo.biz.
Listens for commands from a remote attacker to perform some of the following actions:
Perform a Denial of Service attack against a third party
Connect to a URL
Upload and download files
Execute programs
Conduct port scans
Attempts to spread to the following network shares:
C$
IPC$
ADMIN$
on randomly generated IP addresses using usernames obtained through the NetUserEnum API and a list of passwords.
Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":
Turn off and remove unneeded services. By default, many operating systems install auxiliary services that are not critical, such as an FTP server, telnet, and a Web server. These services are avenues of attack. If they are removed, blended threats have less avenues of attack and you have fewer services to maintain through patch updates.
If a blended threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services (for example, all Windows-based computers should have the current Service Pack installed.). Additionally, please apply any security updates that are mentioned in this writeup, in trusted Security Bulletins, or on vendor Web sites.
Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
Configure your email server to block or remove email that contains file attachments that are commonly used to spread viruses, such as .vbs, .bat, .exe, .pif and .scr files.
Isolate infected computers quickly to prevent further compromising your organization. Perform a forensic analysis and restore the computers using trusted media.
Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
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