Sophos

W32/Codbot-AA

Category
Type
What to do
Prevalence low high

Summary

 
How it spreads
  • Network shares
Affected operating systems Windows
Characteristics
  • Installs itself in the registry
Protection available since 23 September 2005 06:28:47 (GMT)
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Action

More Information

W32/Codbot-AA is a network worm with backdoor Trojan functionality for the Windows platform.

The backdoor component of W32/Codbot-AA connects to a predetermined IRC channel and awaits further commands from a remote user. The backdoor component can be instructed to perform various functions, including:

silently download, install and run new software
start an FTP server
send raw IRC commands
harvest system information
scan networks for vulnerabilities

W32/Codbot-AA spreads through network shares and through various operating system vulnerabilities such as the following:

LSASS (MS04-011)
RPC-DCOM (MS04-012)
IMAIL Server
ASN.1 (MS04-007)

Patches for the vulnerabilities exploited by W32/Codbot-AA can be obtained from Microsoft at:

MS04-011
MS04-012
MS04-007 W32/Codbot-AA is a network worm with backdoor Trojan functionality for the Windows platform.

When run, W32/Codbot-AA copies itself to the Windows system folder as a read-only, hidden, system file winjava.exe and registers itself as a service process with the following properties:

"Description"="Interacts Javascript with the current system."
"DisplayName"="Enables Java Support"
"ImagePath"=<System>\winjava.exe

The following registry entries are created to run winjava.exe as a service process each time the computer starts up:

HKLM\SYSTEM\CurrentControlSet\Services\Java
<several entries>

W32/Codbot-AA also sets values under the following registry entries so that winjava.exe is also run when booting in safe-mode:

HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot\Minimal\Java\

HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot\Network\Java\

The backdoor component of W32/Codbot-AA connects to a predetermined IRC channel and awaits further commands from a remote user. The backdoor component can be instructed to perform various functions, including:

silently download, install and run new software
start an FTP server
send raw IRC commands
harvest system information
scan networks for vulnerabilities

W32/Codbot-AA spreads through network shares and through various operating system vulnerabilities such as the following:

LSASS (MS04-011)
RPC-DCOM (MS04-012)
IMAIL Server
ASN.1 (MS04-007)

Patches for the vulnerabilities exploited by W32/Codbot-AA can be obtained from Microsoft at:

MS04-011
MS04-012
MS04-007

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