Win32.HLLW.Autoruner1.16518

Technical Information

To ensure autorun and distribution:

Modifies the following registry keys:

[<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'svchost' = '%WINDIR%\svchost.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'wuaclt.exe' = '%WINDIR%\javaupdate\expa.exe'

Creates the following files on removable media:

<Drive name for removable media>:\autorun.inf
<Drive name for removable media>:\Nueva Carpeta.exe
<Drive name for removable media>:\explore.exe

Malicious functions:

To complicate detection of its presence in the operating system,

forces the system hide from view:

hidden files

Creates and executes the following:

<LS_APPDATA>\svchost.exe

Executes the following:

<SYSTEM32>\attrib.exe +S +H +R "G:\autorun.inf"
<SYSTEM32>\attrib.exe +S +H +R "F:\autorun.inf"
<SYSTEM32>\attrib.exe +S +H +R "H:\autorun.inf"
<SYSTEM32>\attrib.exe +S +H +R "J:\autorun.inf"
<SYSTEM32>\attrib.exe +S +H +R "I:\autorun.inf"
<SYSTEM32>\attrib.exe +S +H +R "R:\explore.exe"
<SYSTEM32>\attrib.exe +S +H +R "Q:\explore.exe"
<SYSTEM32>\attrib.exe +S +H +R "S:\explore.exe"
<SYSTEM32>\attrib.exe +S +H +R "E:\autorun.inf"
<SYSTEM32>\attrib.exe +S +H +R "<Drive name for removable media>:\autorun.inf"
<SYSTEM32>\attrib.exe +S +H +R "Q:\autorun.inf"
<SYSTEM32>\attrib.exe +S +H +R "P:\autorun.inf"
<SYSTEM32>\attrib.exe +S +H +R "R:\autorun.inf"
<SYSTEM32>\ping.exe 127.0.0.1 -n 60
<SYSTEM32>\attrib.exe +S +H +R "S:\autorun.inf
<SYSTEM32>\attrib.exe +S +H +R "L:\autorun.inf"
<SYSTEM32>\attrib.exe +S +H +R "K:\autorun.inf
<SYSTEM32>\attrib.exe +S +H +R "M:\autorun.inf"
<SYSTEM32>\attrib.exe +S +H +R "O:\autorun.inf"
<SYSTEM32>\attrib.exe +S +H +R "N:\autorun.inf"
<SYSTEM32>\taskkill.exe /f /im explore.exe
<SYSTEM32>\reg.exe ADD HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL /v CheckedValue /t REG_DWORD /d "2" /f
<SYSTEM32>\attrib.exe +S +H +R "<Drive name for removable media>:\explore.exe"
<SYSTEM32>\attrib.exe +S +H +R "F:\explore.exe"
<SYSTEM32>\attrib.exe +S +H +R "E:\explore.exe"
<SYSTEM32>\ping.exe 127.0.0.1 -n 4
%WINDIR%\explorer.exe <Current directory>
<SYSTEM32>\ping.exe 127.0.0.1 -n 2
<SYSTEM32>\reg.exe ADD HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\NOHIDDEN /v CheckedValue /t REG_DWORD /d "2" /f
<SYSTEM32>\reg.exe ADD HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run /v wuaclt.exe /t REG_SZ /d "%WINDIR%\javaupdate\expa.exe" /f
<SYSTEM32>\attrib.exe +S +H +R "M:\explore.exe"
<SYSTEM32>\attrib.exe +S +H +R "L:\explore.exe"
<SYSTEM32>\attrib.exe +S +H +R "N:\explore.exe"
<SYSTEM32>\attrib.exe +S +H +R "P:\explore.exe"
<SYSTEM32>\attrib.exe +S +H +R "O:\explore.exe"
<SYSTEM32>\attrib.exe +S +H +R "H:\explore.exe"
<SYSTEM32>\attrib.exe +S +H +R "G:\explore.exe"
<SYSTEM32>\attrib.exe +S +H +R "I:\explore.exe"
<SYSTEM32>\attrib.exe +S +H +R "K:\explore.exe"
<SYSTEM32>\attrib.exe +S +H +R "J:\explore.exe"

Searches for windows to

detect analytical utilities:

ClassName: 'PROCMON_WINDOW_CLASS' WindowName: ''
ClassName: 'RegMonClass' WindowName: ''
ClassName: 'FileMonClass' WindowName: ''

Modifies file system :

Creates the following files:

%WINDIR%\svchost.exe
%WINDIR%\javaupdate\update_java.exe
%WINDIR%\temvir - CRNJEUFU.txt
%WINDIR%\csrss.exe
%WINDIR%\javaupdate\update.dll
<LS_APPDATA>\expa.exe
<LS_APPDATA>\svchost.exe
%WINDIR%\javaupdate\expa.exe
%TEMP%\a51921.bat

Sets the 'hidden' attribute to the following files:

<Drive name for removable media>:\autorun.inf
<Drive name for removable media>:\explore.exe
%TEMP%\a51921.bat

Network activity:

Connects to:

'mo####n.comxa.com':21

UDP:

DNS ASK mo####n.comxa.com

Miscellaneous:

Searches for the following windows:

ClassName: 'edit' WindowName: ''
ClassName: '' WindowName: 'TeamViewer - Registro de sucesos de la transferencia de archivos'
ClassName: '' WindowName: 'Sesion esponsorizada'
ClassName: '' WindowName: 'TeamViewer'
ClassName: '' WindowName: ''
ClassName: 'ThunderRT6FormDC' WindowName: 'Shareware Cheater v 3.0'
ClassName: 'ThunderRT6FormDC' WindowName: ''

Technologies

Terminology

Training and education

Myths

Technical Information