W32/Rbot-BFW is a worm and IRC backdoor Trojan for the Windows platform.
W32/Rbot-BFW spreads to other network computers by exploiting common buffer overflow vulnerabilities, including: LSASS (MS04-011), RPC-DCOM (MS04-012), WKS (MS03-049) (CAN-2003-0812) and ASN.1 (MS04-007) and by copying itself to network shares protected by weak passwords.
W32/Rbot-BFW 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-BFW copies itself to <System>\dczwin32.exe.
The following registry entries are created to run dczwin32.exe on startup:
HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Microsoft Winsock
dczwin32.exe
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Microsoft Winsock
dczwin32.exe
HKCU\Software\Microsoft\Windows\CurrentVersion\RunServices
Microsoft Winsock
dczwin32.exe
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
Microsoft Winsock
dczwin32.exe
Registry entries are set as follows:
HKCU\SYSTEM\CurrentControlSet\Control\Lsa
Microsoft Winsock
dczwin32.exe
HKLM\SYSTEM\CurrentControlSet\Control\Lsa
Microsoft Winsock
dczwin32.exe
HKCU\Software\Microsoft\OLE
Microsoft Winsock
dczwin32.exe
HKLM\SOFTWARE\Microsoft\Ole
Microsoft Winsock
dczwin32.exe