W32/Rbot-GQK is a worm and IRC backdoor for the Windows platform.
W32/Rbot-GQK spreads to other network computers by exploiting common buffer overflow vulnerabilities, including: LSASS (MS04-011) and RPC-DCOM (MS04-012).
W32/Rbot-GQK 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.
When first run W32/Rbot-GQK copies itself to <System>\pwjbvphi.exe.
The following registry entry is created to run <System>\pwjbvphi.exe on startup:
HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Microsoft Windows
pwjbvphi.exe
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
Microsoft Windows
pwjbvphi.exe
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Microsoft Windows
pwjbvphi.exe