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Summary
Summary
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| How it spreads |
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|---|---|
| Affected operating systems | Windows |
| Characteristics |
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| Protection available since | 27 October 2005 14:02:51 (GMT) |
| Detected by | All Sophos products |
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Action
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More Information
W32/Codbot-AH is a worm and IRC backdoor Trojan for the Windows platform.
W32/Codbot-AH spreads to other network computers by exploiting common buffer overflow vulnerabilities, including: LSASS (MS04-011), RPC-DCOM (MS04-012), IMAIL Server and ASN.1 (MS04-007).
W32/Codbot-AH runs continuously in the background, providing a backdoor server which allows a remote intruder to gain access and control over the computer via IRC channels.
When first run W32/Codbot-AH copies itself to <System>\nbthlp.exe.
The file nbthlp.exe is registered as a new system driver service named "NetBIOS Helper", with a display name of "NetBIOS Helper Service" and a startup type of automatic, so that it is started automatically during system startup. Registry entries are created under:
HKLM\SYSTEM\CurrentControlSet\Services\NetBIOS Helper\
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