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Win32.HLLW.Autoruner1.5232

Added to the Dr.Web virus database: 2011-12-05

Virus description added: 2011-12-06

Technical Information

To ensure autorun and distribution:

Modifies the following registry keys:

[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yljaud' = '%HOMEPATH%\yljaud.exe /H'
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yljaud' = '%HOMEPATH%\yljaud.exe /k'
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yljaud' = '%HOMEPATH%\yljaud.exe /o'
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yljaud' = '%HOMEPATH%\yljaud.exe /u'
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yljaud' = '%HOMEPATH%\yljaud.exe /v'
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yljaud' = '%HOMEPATH%\yljaud.exe /Z'

Creates the following files on removable media:

<Drive name for removable media>:\Passwords.exe
<Drive name for removable media>:\RCX3.tmp
<Drive name for removable media>:\RCX2.tmp
<Drive name for removable media>:\RCX6.tmp
<Drive name for removable media>:\RCX5.tmp
<Drive name for removable media>:\RCX4.tmp
<Drive name for removable media>:\Secret.exe
<Drive name for removable media>:\yljaud.exe
<Drive name for removable media>:\autorun.inf
<Drive name for removable media>:\Porn.exe
<Drive name for removable media>:\RCX1.tmp
<Drive name for removable media>:\Sexy.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:

%HOMEPATH%\yljaud.exe

Modifies file system :

Creates the following files:

%HOMEPATH%\yljaud.exe

Sets the 'hidden' attribute to the following files:

<Drive name for removable media>:\yljaud.exe
<Drive name for removable media>:\autorun.inf
%HOMEPATH%\yljaud.exe

Deletes the following files:

<Drive name for removable media>:\Passwords.exe
<Drive name for removable media>:\Porn.exe
<Drive name for removable media>:\Sexy.exe

Network activity:

Connects to:

'ns#.##ayer1352.com':8000

UDP:

DNS ASK ns#.##ayer1352.com
'<Private IP address>':1036

Miscellaneous:

Searches for the following windows:

ClassName: 'Indicator' WindowName: ''