Sophos

W32/Delbot-AL

Category
Type
What to do
Prevalence low high

Summary

 
How it spreads
  • Network shares
Affected operating systems Windows
Characteristics
  • Installs itself in the registry
Included in our products from June 2007 (4.18)
Protection available since 18 April 2007 20:14:46 (GMT)
Detected by All Sophos products

Action

More Information

W32/Delbot-AL is a worm with backdoor functionality for the Windows platform.

W32/Delbot-AL spreads to other network computers by scanning network shares for weak passwords, and by exploiting common buffer overflow vulnerabilities, including:
- Symantec (SYM06-010)
- Microsoft Security Advisory (935964): Vulnerability in RPC on Windows DNS Server Could Allow Remote Code Execution.

W32/Delbot-AL runs continuously in the background, providing a backdoor server which allows a remote intruder to gain access and control over the computer, and includes functionality to download, install and run new software.

When first run W32/Delbot-AL copies itself to <System>\cnen.exe and attempts to download a file to <Root>\site.exe. At the time of writing this downloaded file is detected as Troj/Delback-B.

The following registry entry is created to run cnen.exe on startup:

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
nClient
<System>\cnen.exe

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