W32/Rbot-BFN is a worm and IRC backdoor Trojan for the Windows platform.
W32/Rbot-BFN spreads to other network computers by exploiting common buffer overflow vulnerabilities, including: LSASS (MS04-011), WKS (MS03-049) (CAN-2003-0812) and ASN.1 (MS04-007).
W32/Rbot-BFN 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-BFN copies itself to <System>\mswsa32.exe.
The following registry entries are created to run mswsa32.exe on startup:
HKCU\Software\Microsoft\Windows\CurrentVersion\Run
MS Windows System Alert
MSWSA32.exe
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
MS Windows System Alert
MSWSA32.exe
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
MS Windows System Alert
MSWSA32.exe