W32/Rbot-AJL is a worm and IRC backdoor Trojan for the Windows platform.
W32/Rbot-AJL 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), MSSQL (MS02-039) (CAN-2002-0649) and Veritas (CAN-2004-1172) and by copying itself to network shares protected by weak passwords.
W32/Rbot-AJL 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-AJL copies itself to the Windows system folder as winPE.exe.
The following registry entries are created to run winPE.exe on startup:
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
ms ownage
winPE.exe
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
ms ownage
winPE.exe
W32/Rbot-AJL sets the following registry entries, disabling the automatic startup of other software:
HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess
Start
4
HKLM\SYSTEM\CurrentControlSet\Services\wuauserv
Start
4
Registry entries are set as follows:
HKCU\Software\Microsoft\OLE
ms ownage
winPE.exe
HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings
MaxConnectionsPer1_0Server
50
HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings
MaxConnectionsPerServer
50
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-AJL can be obtained from the Microsoft website:
MS02-039
MS03-049
MS04-011
MS04-012