BackDoor.IRC.Bot.1720

Technical Information

To ensure autorun and distribution:

Modifies the following registry keys:

[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\ctfmon.exe] 'Debugger' = 'wiacmfgr.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'ctfmon.exe' = 'ctfmon.exe'

Malicious functions:

To bypass firewall, removes or modifies the following registry keys:

[<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List] '<SYSTEM32>\wiacmfgr.exe' = '<SYSTEM32>\wiacmfgr.exe:*:Enabled:DHCP Router'
[<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '<SYSTEM32>\wiacmfgr.exe' = '<SYSTEM32>\wiacmfgr.exe:*:Enabled:DHCP Router'

Creates and executes the following:

<SYSTEM32>\wiacmfgr.exe <Full path to virus>

Executes the following:

<SYSTEM32>\net1.exe stop KPF4
<SYSTEM32>\sc.exe config SmcService start= disabled
<SYSTEM32>\sc.exe delete SmcService
<SYSTEM32>\sc.exe delete KPF4
<SYSTEM32>\sc.exe stop SmcService
<SYSTEM32>\net.exe stop SmcService
<SYSTEM32>\sc.exe stop cmdAgent
<SYSTEM32>\sc.exe delete cmdAgent
<SYSTEM32>\net1.exe stop cmdAgent
<SYSTEM32>\sc.exe stop vsmon
<SYSTEM32>\net.exe stop cmdAgent
<SYSTEM32>\net1.exe stop SmcService
<SYSTEM32>\sc.exe config cmdAgent start= disabled
<SYSTEM32>\sc.exe config KPF4 start= disabled
<SYSTEM32>\sc.exe config OutpostFirewall start= disabled
<SYSTEM32>\sc.exe delete OutpostFirewall
<SYSTEM32>\net.exe stop TmPfw
<SYSTEM32>\net.exe stop OutpostFirewall
<SYSTEM32>\net1.exe stop McShield
<SYSTEM32>\sc.exe stop OutpostFirewall
<SYSTEM32>\sc.exe stop TmPfw
<SYSTEM32>\net1.exe stop TmPfw
<SYSTEM32>\net.exe stop KPF4
<SYSTEM32>\sc.exe stop KPF4
<SYSTEM32>\net1.exe stop OutpostFirewall
<SYSTEM32>\sc.exe config TmPfw start= disabled
<SYSTEM32>\sc.exe delete TmPfw
<SYSTEM32>\sc.exe config acssrv start= disabled
<SYSTEM32>\sc.exe delete acssrv
<SYSTEM32>\net.exe stop SAVService
<SYSTEM32>\net.exe stop acssrv
<SYSTEM32>\sc.exe /C sc stop SAVService
<SYSTEM32>\sc.exe stop acssrv
<SYSTEM32>\sc.exe stop SAVService
<SYSTEM32>\sc.exe stop SAVAdminService
<SYSTEM32>\net.exe stop SAVAdminService
<SYSTEM32>\sc.exe config SAVAdminService start= disabled
<SYSTEM32>\sc.exe /pid=3380
<SYSTEM32>\sc.exe config SavService start= disabled
<SYSTEM32>\net1.exe /C sc stop "Sophos AutoUpdate Service"
<SYSTEM32>\net1.exe stop SPF4
<SYSTEM32>\net.exe stop SbPF.Launcher
<SYSTEM32>\sc.exe stop SbPF.Launcher
<SYSTEM32>\sc.exe delete vsmon
<SYSTEM32>\net.exe stop vsmon
<SYSTEM32>\sc.exe config vsmon start= disabled
<SYSTEM32>\net1.exe stop vsmon
<SYSTEM32>\sc.exe config SbPF.Launcher start= disabled
<SYSTEM32>\sc.exe config SPF4 start= disabled
<SYSTEM32>\net1.exe stop SbPF.Launcher
<SYSTEM32>\sc.exe delete SPF4
<SYSTEM32>\sc.exe delete SbPF.Launcher
<SYSTEM32>\net.exe stop SPF4
<SYSTEM32>\sc.exe stop SPF4
<SYSTEM32>\sc.exe delete McShield
<SYSTEM32>\sc.exe stop AntiVirService
<SYSTEM32>\sc.exe config AntiVirService start= disabled
<SYSTEM32>\sc.exe delete AntiVirService
<SYSTEM32>\sc.exe delete "avast! Antivirus"
<SYSTEM32>\net.exe stop AntiVirService
<SYSTEM32>\net1.exe stop "avast! Antivirus"
<SYSTEM32>\net.exe stop PASRV
<SYSTEM32>\sc.exe delete PASRV
<SYSTEM32>\net.exe stop VSSERV
<SYSTEM32>\net1.exe stop PASRV
<SYSTEM32>\net1.exe stop AntiVirService
<SYSTEM32>\sc.exe stop PASRV
<SYSTEM32>\sc.exe config PASRV start= disabled
<SYSTEM32>\sc.exe config "avast! Antivirus" start= disabled
<SYSTEM32>\sc.exe config K7RTScan start= disabled
<SYSTEM32>\sc.exe delete K7RTScan
<SYSTEM32>\net1.exe stop K7RTScan
<SYSTEM32>\ipconfig.exe /flushdns
<SYSTEM32>\net.exe stop K7RTScan
<SYSTEM32>\sc.exe stop K7RTScan
<SYSTEM32>\net.exe stop K7TSMngr
<SYSTEM32>\sc.exe delete K7TSMngr
<SYSTEM32>\sc.exe stop "avast! Antivirus"
<SYSTEM32>\net1.exe stop K7TSMngr
<SYSTEM32>\sc.exe stop K7TSMngr
<SYSTEM32>\sc.exe config K7TSMngr start= disabled
<SYSTEM32>\net.exe stop "avast! Antivirus"
<SYSTEM32>\sc.exe delete NOD32krn
<SYSTEM32>\net.exe stop ekrn
<SYSTEM32>\net1.exe stop NOD32krn
<SYSTEM32>\net1.exe stop avg9wd
<SYSTEM32>\sc.exe stop NOD32krn
<SYSTEM32>\sc.exe config NOD32krn start= disabled
<SYSTEM32>\sc.exe stop ekrn
<SYSTEM32>\sc.exe stop McShield
<SYSTEM32>\net1.exe stop ekrn
<SYSTEM32>\sc.exe config McShield start= disabled
<SYSTEM32>\sc.exe config ekrn start= disabled
<SYSTEM32>\sc.exe delete ekrn
<SYSTEM32>\net.exe stop McShield
<SYSTEM32>\net.exe stop NOD32krn
<SYSTEM32>\net.exe stop avg8wd
<SYSTEM32>\sc.exe stop avg8wd
<SYSTEM32>\sc.exe config avg8wd start= disabled
<SYSTEM32>\sc.exe stop VSSERV
<SYSTEM32>\sc.exe config VSSERV start= disabled
<SYSTEM32>\sc.exe delete VSSERV
<SYSTEM32>\net1.exe stop VSSERV
<SYSTEM32>\sc.exe stop avg9wd
<SYSTEM32>\sc.exe config avg9wd start= disabled
<SYSTEM32>\sc.exe delete avg9wd
<SYSTEM32>\net1.exe stop avg8wd
<SYSTEM32>\sc.exe delete avg8wd
<SYSTEM32>\net.exe stop avg9wd

Injects code into

the following system processes:

%WINDIR%\Explorer.EXE

Hides the following processes:

<SYSTEM32>\net.exe
<SYSTEM32>\wiacmfgr.exe
<Full path to virus>
<SYSTEM32>\cmd.exe
<SYSTEM32>\sc.exe

Modifies file system :

Creates the following files:

<SYSTEM32>\wiacmfgr.exe
%HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\KHMHGZ4F\rix[1]

Sets the 'hidden' attribute to the following files:

<SYSTEM32>\wiacmfgr.exe

Deletes itself.

Network activity:

Connects to:

'sr##.###senger-update.ru':9899
'ri#.###senger-update.ru':80

TCP:

HTTP GET requests:

ri#.###senger-update.ru/rix

UDP:

DNS ASK sr##.#eefxport.info
DNS ASK sr##.##inmeround.info
DNS ASK sr##.#astride.info
DNS ASK ri#.###senger-update.ru
DNS ASK sr##.###senger-update.ru
DNS ASK bs#.###senger-update.ru

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