W32/Rbot-BM is a worm which attempts to spread to remote network shares. It
also contains backdoor Trojan functionality, allowing unauthorised remote
access to the infected computer via IRC channels while running in the
background as a service process.
W32/Rbot-BM spreads to network shares with weak passwords as a result of
the backdoor Trojan element receiving the appropriate command from a remote user.
W32/Rbot-BM copies itself to the Windows system folder as WUAMMGR32.EXE
and creates entries at the following locations in the registry so as to run itself
on system startup, trying to reset them every minute:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run
HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices
HKCU\Software\Microsoft\Windows\CurrentVersion\Run
W32/Rbot-BM sets the following registry entries, trying to reset them every
2 minutes.
HKLM\SOFTWARE\Microsoft\Ole\EnableDCOM = "N"
HKLM\SYSTEM\CurrentControlSet\Control\Lsa\restrictanonymous = "1"
W32/Rbot-BM tries to delete the C$, D$, E$, IPC$ and ADMIN$ network shares
on the host computer every 2 minutes.
W32/Rbot-BM attempts to terminate certain processes related to anti-virus
and security programs including REGEDIT.EXE, MSCONFIG.EXE and NETSTAT.EXE.