Sophos

W32/IrcWorm-A

Category
Type
What to do
Prevalence low high

Summary

 
How it spreads
  • Chat programs
Affected operating systems Windows
Characteristics
  • Installs itself in the registry
Included in our products from May 2007 (4.17)
Protection available since 27 March 2007 09:30:57 (GMT)
Detected by All Sophos products

Action

More Information

W32/IrcWorm-A is an IRC worm for the Windows platform.

When W32/IrcWorm-A is installed the following files are created:

<Windows>\photo album.zip
<System>\rdfhost.dll

The worm will then attempt to connect to an IRC channel and begin sending messages enticing other users to accept the file transfer of zip file.

The following registry entry is created to run code exported by {5344BB88-3DE1-409F-8307-C85923A1F4DD} on startup:

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\ShellServiceObjectDelayLoad
rdshost
{5344BB88-3DE1-409F-8307-C85923A1F4DD}

The file rdfhost.dll is registered as a COM object, creating registry entries under:

HKCR\CLSID\{5344BB88-3DE1-409F-8307-C85923A1F4DD}

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