W32/Rbot-ML 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-ML moves itself to the Windows system folder as msisrv32.exe and creates the following registry entries to ensure it is run at system logon:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
Microsoft Service InstallShield = msisrv32.exe
HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices\
Microsoft Service InstallShield = msisrv32.exe
W32/Rbot-ML also sets the following registry entry:
HKCU\Software\Microsoft\OLE\
Microsoft Service InstallShield = msisrv32.exe
W32/Rbot-ML speads to network shares with weak passwords and via network security vulnerabilities including the LSASS(MS04-011), RPC-DCOM(MS04-012), IIS5SSL(MS04-011), DameWare(CAN-2003-1030) and WebDav(MS03-007) vulnerabilities.
W32/Rbot-ML can also download and execute remote files on the infected computer, terminate processes related to security applications, log key strokes, retrieve information such as CD keys for various games and flood other computers with network packets.