Sophos

W32/Rbot-AWD

Aliases
  • Backdoor.Win32.Rbot.agc
  • W32/Gaobot.worm.gen.j
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 7 November 2005 11:47:14 (GMT)
Last updated 25 November 2005 13:35:31 (GMT)
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Action

More Information

W32/Rbot-AWD is a worm and IRC backdoor Trojan for the Windows platform.

W32/Rbot-AWD 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.

W32/Rbot-AWD spreads:

- to other network computers infected with Troj/Optix
- to other network computers by exploiting common buffer overflow vulnerabilities, including: LSASS (MS04-011), RPC-DCOM (MS04-012), WKS (MS03-049) (CAN-2003-0812), Veritas (CAN-2004-1172), PNP (MS05-039) and ASN.1 (MS04-007)
- by copying itself to network shares protected by weak passwords

W32/Rbot-AWD includes functionality to:

- carry out DDoS flooder attacks
- provide a proxy server
- silently download, install and run new software
- disable other software, including anti-virus, firewall and security related applications
- log keystrokes

When first run W32/Rbot-AWD copies itself to <System>\npfmontr.exe.

The following registry entries are created to run npfmontr.exe on startup:

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
NPF Value
NPFMONTR.exe

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
NPF Value
NPFMONTR.exe

Registry entries are set as follows:

HKCU\Software\Microsoft\OLE
NPF Value
NPFMONTR.exe

HKLM\SOFTWARE\Microsoft\Ole
EnableDCOM
N

HKLM\SYSTEM\CurrentControlSet\Control\Lsa
restrictanonymous
1

The following patches for the operating system vulnerabilities exploited by W32/Rbot-AWD can be obtained from the Microsoft website:

MS04-011
MS04-012
MS03-049
MS05-039
MS04-007

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