W32/Rbot-AJY is a worm and IRC backdoor Trojan for the Windows platform.
W32/Rbot-AJY 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 WINS (MS04-045) and by copying itself to network shares protected by weak passwords.
W32/Rbot-AJY 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-AJY copies itself to <System>\w32explorer.exe.
The following registry entries are created to run w32explorer.exe on startup:
HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Systray
w32explorer.exe
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Systray
w32explorer.exe
HKCU\Software\Microsoft\Windows\CurrentVersion\RunServices
Systray
w32explorer.exe
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
Systray
w32explorer.exe
Registry entries are set as follows:
HKCU\SYSTEM\CurrentControlSet\Control\Lsa
Systray
w32explorer.exe
HKLM\SYSTEM\CurrentControlSet\Control\Lsa
Systray
w32explorer.exe
HKCU\Software\Microsoft\OLE
Systray
w32explorer.exe
HKLM\SOFTWARE\Microsoft\Ole
Systray
w32explorer.exe
HKLM\SOFTWARE\Microsoft\Ole
EnableDCOM
N
HKLM\SYSTEM\CurrentControlSet\Control\Lsa
restrictanonymous
1
The following patches for the operating system vulnerabilities exploited by W32/Rbot-AJY can be obtained from the Microsoft website:
MS04-011
MS04-012
MS03-049
MS04-045