BackDoor.Maxplus.6196

Technical Information

To ensure autorun and distribution:

Modifies the following registry keys:

[<HKLM>\SYSTEM\ControlSet001\Services\WinSock2\Parameters\Protocol_Catalog9\Catalog_Entries\000000000002] 'PackedCatalogItem' = ''
[<HKLM>\SYSTEM\ControlSet001\Services\WinSock2\Parameters\Protocol_Catalog9\Catalog_Entries\000000000003] 'PackedCatalogItem' = ''
[<HKLM>\SYSTEM\ControlSet001\Services\WinSock2\Parameters\Protocol_Catalog9\Catalog_Entries\000000000004] 'PackedCatalogItem' = ''
[<HKLM>\SYSTEM\ControlSet001\Services\WinSock2\Parameters\NameSpace_Catalog5\Catalog_Entries\000000000001] 'LibraryPath' = 'mswsock.dll'
[<HKLM>\SYSTEM\ControlSet001\Services\WinSock2\Parameters\NameSpace_Catalog5\Catalog_Entries\000000000003] 'LibraryPath' = 'mswsock.dll'
[<HKLM>\SYSTEM\ControlSet001\Services\WinSock2\Parameters\Protocol_Catalog9\Catalog_Entries\000000000001] 'PackedCatalogItem' = ''
[<HKLM>\SYSTEM\ControlSet001\Services\WinSock2\Parameters\Protocol_Catalog9\Catalog_Entries\000000000005] 'PackedCatalogItem' = ''
[<HKLM>\SYSTEM\ControlSet001\Services\WinSock2\Parameters\Protocol_Catalog9\Catalog_Entries\000000000009] 'PackedCatalogItem' = ''
[<HKLM>\SYSTEM\ControlSet001\Services\WinSock2\Parameters\Protocol_Catalog9\Catalog_Entries\000000000010] 'PackedCatalogItem' = ''
[<HKLM>\SYSTEM\ControlSet001\Services\WinSock2\Parameters\Protocol_Catalog9\Catalog_Entries\000000000011] 'PackedCatalogItem' = ''
[<HKLM>\SYSTEM\ControlSet001\Services\WinSock2\Parameters\Protocol_Catalog9\Catalog_Entries\000000000006] 'PackedCatalogItem' = ''
[<HKLM>\SYSTEM\ControlSet001\Services\WinSock2\Parameters\Protocol_Catalog9\Catalog_Entries\000000000007] 'PackedCatalogItem' = ''
[<HKLM>\SYSTEM\ControlSet001\Services\WinSock2\Parameters\Protocol_Catalog9\Catalog_Entries\000000000008] 'PackedCatalogItem' = ''

Creates the following services:

[<HKLM>\SYSTEM\ControlSet001\Services\.mrxsmb] 'ImagePath' = '\?'

Malicious functions:

Injects code into

the following system processes:

<SYSTEM32>\winlogon.exe
%WINDIR%\Explorer.EXE

Modifies file system :

Creates the following files:

%WINDIR%\$NtUninstallKB27979$\4121336045\@
%WINDIR%\$NtUninstallKB27979$\4121336045\L\alehhooo
%WINDIR%\$NtUninstallKB27979$\4121336045\Desktop.ini

Deletes itself.

Network activity:

Connects to:

'21#.#08.252.185':80
'pr####.fling.com':80

TCP:

HTTP GET requests:

21#.#08.252.185/5699002-2F6F334BF9ACF1B2401D3874A5B0C048/counter.img?th################################
21#.#08.252.185/5699002-2F6F334BF9ACF1B2401D3874A5B0C048/counter.img?th###############################
pr####.fling.com/geo/txt/city.php

UDP: