W32/Rbot-JJ 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-JJ moves itself to the Windows system folder as winsdnz.exe and creates the following registry entries to ensure it is run at system logon:
HKCU\Software\Microsoft\Windows\CurrentVersion\Run\
Microsoft Loader = winsdnz.exe
HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
Microsoft Loader = winsdnz.exe
HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices\
Microsoft Loader = winsdnz.exe
W32/Rbot-JJ may also set the following registry entries:
HKLM\Software\Microsoft\Ole\EnableDCOM = N
HKLM\System\CurrentControlSet\Control\Lsa\restrictanonymous = 1
W32/Rbot-JJ speads to network shares with weak passwords and by exploiting system vulnerabilities including the RPC DCOM (MS04-012), WebDav (MS03-007), LSASS (MS04-011) and DameWare (CAN-2003-1030) vulnerabilities.
W32/Rbot-JJ will also download and execute remote files on the infected computer, log key strokes, retrieve information such as CD keys for various games and flood other computers with network packets.