W32/Rbot-GTJ is a worm with IRC backdoor functionality for the Windows platform.
W32/Rbot-GTJ spreads to other network computers by exploiting common buffer overflow vulnerabilities, including: LSASS (MS04-011), RPC-DCOM (MS04-012), WKS (MS03-049) (CAN-2003-0812) and ASN.1 (MS04-007) and by copying itself to network shares protected by weak passwords.
W32/Rbot-GTJ 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-GTJ copies itself to <System>\csrs.exe.
The following registry entries are created to run csrs.exe on startup:
HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Microsoft Corp. Critical Services
csrs.exe
HKCU\Software\Microsoft\Windows\CurrentVersion\RunServices
Microsoft Corp. Critical Services
csrs.exe
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Microsoft Corp. Critical Services
csrs.exe
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
Microsoft Corp. Critical Services
csrs.exe
Registry entries are set as follows:
HKCU\Software\Microsoft\OLE
Microsoft Corp. Critical Services
csrs.exe
HKLM\SOFTWARE\Microsoft\Ole
Microsoft Corp. Critical Services
csrs.exe