W32/Rbot-SZ 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-SZ copies itself to the Windows system folder as CRSSS.EXE and creates entries at the following locations in the registry so as to run itself on system startup:
HKCU\Software\Microsoft\Windows\CurrentVersion\Run\
start uploading = "crsss.exe"
HKCU\Software\Microsoft\Windows\CurrentVersion\RunServices\
start uploading = "crsss.exe"
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\
start uploading = "crsss.exe"
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices\
start uploading = "crsss.exe"
HKLM\SOFTWARE\Microsoft\Ole\
start uploading = "crsss.exe"
HKLM\SYSTEM\ControlSet001\Control\Lsa\
start uploading = "crsss.exe"
HKLM\SYSTEM\CurrentControlSet\Control\Lsa\
start uploading = "crsss.exe"
HKCU\SYSTEM\CurrentControlSet\Control\Lsa\
start uploading = "crsss.exe"
HKCU\Software\Microsoft\OLE\
start uploading = "crsss.exe"
W32/Rbot-SZ also sets the following registry entries:
HKLM\SOFTWARE\Microsoft\Ole\
EnableDCOM = "N"
HKLM\SYSTEM\CurrentControlSet\Control\Lsa\restrictanonymous