W32/Rbot-AJA

Please follow the instructions for removing worms.

W32/Rbot-AJA is a worm and IRC backdoor Trojan for the Windows platform.

W32/Rbot-AJA spreads to other network computers by exploiting common buffer overflow vulnerabilites, including:

LSASS (MS04-011)
RPC-DCOM (MS04-012)
MSSQL (MS02-039) (CAN-2002-0649)

W32/Rbot-AJA 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.

W32/Rbot-AJA includes functionality to:

- steal confidential information including Internet Account Manager and Hotmail user accounts and passwords
- carry out DDoS flooder attacks
- silently download, install and run new software
- access the internet and communicate with a remote server via HTTP
- act as a SOCKS4 proxy

When first run W32/Rbot-AJA moves itself to <Windows>\lsass.exe and creates the file <System>\rdriv.sys.

The file rdriv.sys is detected as Troj/Rootkit-W.

The file lsass.exe is registered as a new system driver service named "Local Security Authority System Service", with a display name of "lsass" and a startup type of automatic, so that it is started automatically during system startup.

The file rdriv.sys is registered as a new system driver service named "rdriv", with a display name of "rdriv".

The following patches for the operating system vulnerabilities exploited by W32/Rbot-AJA can be obtained from the Microsoft website:

MS04-012
MS04-011
MS02-039 W32/Rbot-AJA is a worm and IRC backdoor Trojan for the Windows platform.

W32/Rbot-AJA spreads to other network computers by exploiting common buffer overflow vulnerabilites, including:

LSASS (MS04-011)
RPC-DCOM (MS04-012)
MSSQL (MS02-039) (CAN-2002-0649)

W32/Rbot-AJA 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.

W32/Rbot-AJA includes functionality to:

- steal confidential information including Internet Account Manager and Hotmail user accounts and passwords
- carry out DDoS flooder attacks
- silently download, install and run new software
- access the internet and communicate with a remote server via HTTP
- act as a SOCKS4 proxy

When first run W32/Rbot-AJA moves itself to <Windows>\lsass.exe and creates the file <System>\rdriv.sys.

The file rdriv.sys is detected as Troj/Rootkit-W.

The file lsass.exe is registered as a new system driver service named "Local Security Authority System Service", with a display name of "lsass" and a startup type of automatic, so that it is started automatically during system startup. Registry entries are created under:

HKLM\SYSTEM\CurrentControlSet\Services\Local Security Authority System Service\

The file rdriv.sys is registered as a new system driver service named "rdriv", with a display name of "rdriv". Registry entries are created under:

HKLM\SYSTEM\CurrentControlSet\Services\rdriv\

W32/Rbot-AJA sets the following registry entries, disabling the automatic startup of other software:

HKLM\SYSTEM\CurrentControlSet\Services\Messenger
Start
4

HKLM\SYSTEM\CurrentControlSet\Services\RemoteRegistry
Start
4

HKLM\SYSTEM\CurrentControlSet\Services\TlntSvr
Start
4

Registry entries are set as follows:

HKLM\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate
DoNotAllowXPSP2
1

HKLM\SOFTWARE\Microsoft\Ole
EnableDCOM
N

HKLM\SYSTEM\CurrentControlSet\Control\Lsa
restrictanonymous
1

HKLM\SYSTEM\CurrentControlSet\Hardware Profiles\0001\Software\
Microsoft\windows\CurrentVersion\Internet Settings
ProxyEnable
1

HKLM\SYSTEM\CurrentControlSet\Hardware Profiles\Current\Software\
Microsoft\windows\CurrentVersion\Internet Settings
ProxyEnable
1

Registry entries are created under:

HKLM\SOFTWARE\Microsoft\Security Center\
HKLM\SOFTWARE\Policies\Microsoft\WindowsFirewall\DomainProfile\
HKLM\SOFTWARE\Policies\Microsoft\WindowsFirewall\StandardProfile\

The following patches for the operating system vulnerabilities exploited by W32/Rbot-AJA can be obtained from the Microsoft website:

MS04-012
MS04-011
MS02-039