Sophos

W32/Rbot-FWX

Category
Type
What to do
Prevalence low high

Summary

 
How it spreads
  • Network shares
Affected operating systems Windows
Characteristics
  • Drops more malware
  • Installs itself in the registry
Included in our products from May 2007 (4.17)
Protection available since 24 November 2006 20:43:32 (GMT)
Last updated 18 March 2007 00:50:49 (GMT)
Detected by All Sophos products

Action

More Information

W32/Rbot-FWX is a worm for the Windows platform which includes backdoor functionality.

W32/Rbot-FWX spreads to network shares protected with weak passwords.

W32/Rbot-FWX 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/Rbot-FWX copies itself to <System>\1x32.exe and creates the
file \a.bat.

The file a.bat is detected as Troj/Batten-A.

The following registry entries are created to run 1x32.exe on startup:

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Numerical Xtermz Agent
1x32.exe

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
Numerical Xtermz Agent
1x32.exe

W32/Rbot-FWX sets the following registry entries, disabling the automatic
startup of other software:

HKLM\SYSTEM\CurrentControlSet\Services\wuauserv
Start
4

HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess
Start
4

Note: disabling autostart for the SharedAccess service deactivates the
Microsoft
Internet Connection Firewall (ICF).

Registry entries are set as follows:

HKCU\Software\Microsoft\OLE
Numerical Xtermz Agent
1x32.exe

HKLM\SOFTWARE\Microsoft\Ole
EnableRemoteConnect
N

HKLM\SOFTWARE\Microsoft\Ole
EnableDCOM
N

HKLM\SYSTEM\CurrentControlSet\Control\Lsa
restrictanonymous
1

Registry entries are created under:

HKCR\.key\

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