Sophos

W32/Sdbot-AJA

Aliases
  • WORM_SDBOT.CRG
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 21 December 2005 10:11:10 (GMT)
Detected by All Sophos products
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Action

More Information

W32/Sdbot-AJA is a worm and IRC backdoor Trojan for the Windows platform.

W32/Sdbot-AJA spreads to other network computers by exploiting common buffer overflow vulnerabilities, including: RPC-DCOM (MS04-012) and ASN.1 (MS04-007).

W32/Sdbot-AJA includes functionalities to:

- access the internet and communicate with a remote server via HTTP
- allow a remote intruder to gain access and control over the infected computer via IRC

When run, W32/Sdbot-AJA copies itself to <Windows>\dcmhelp.exe.

The file dcmhelp.exe is registered as a new system driver service named "DcomHelper", with a display name of "DcomHelper Service" and a startup type of automatic, so that it is started automatically during system startup. When run, W32/Sdbot-AJA sets the following registry entries:

HKLM\SYSTEM\CurrentControlSet\Services\DcomHelper\

HKLM\SYSTEM\CurrentControlSet\Services\Messenger
Start
4

HKLM\SYSTEM\CurrentControlSet\Services\RemoteRegistry
Start
4

HKLM\SYSTEM\CurrentControlSet\Services\TlntSvr
Start
4

HKLM\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate
DoNotAllowXPSP2
1

HKLM\SOFTWARE\Microsoft\Ole
EnableDCOM
N

HKLM\SYSTEM\CurrentControlSet\Control\Lsa
restrictanonymous
1

HKLM\SOFTWARE\Microsoft\Security Center\

HKLM\SOFTWARE\Policies\Microsoft\WindowsFirewall\DomainProfile\

HKLM\SOFTWARE\Policies\Microsoft\WindowsFirewall\StandardProfile\

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