W32/Rbot-ANF is a worm and IRC backdoor Trojan for the Windows platform.
W32/Rbot-ANF 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-ANF exploits the following vulnerabilities:
LSASS (MS04-011)
RPC-DCOM (MS04-012)
WKS (MS03-049) (CAN-2003-0812)
MSSQL (MS02-039) (CAN-2002-0649)
When first run W32/Rbot-ANF copies itself to <System>\mfs.exe.
The following registry entries are created to run mfs.exe on startup:
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Microsoft Incroporate
mfs.exe
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
Microsoft Incroporate
mfs.exe
W32/Rbot-ANF sets the following registry entries, disabling the automatic startup of other software:
HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess
Start
4
HKLM\SYSTEM\CurrentControlSet\Services\wuauserv
Start
4
Registry entries are set as follows:
HKCU\Software\Microsoft\OLE
Microsoft Incroporate
mfs.exe
HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings
MaxConnectionsPer1_0Server
50
HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings
MaxConnectionsPerServer
50
HKLM\SOFTWARE\Microsoft\Ole
EnableDCOM
N
HKLM\SYSTEM\CurrentControlSet\Control\Lsa
restrictanonymous
1