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Win32.HLLP.Swisyn
Added to the Dr.Web virus database:
2013-05-21
Virus description added:
2019-07-19
Technical Information
To ensure autorun and distribution
Modifies the following registry keys
[<HKLM>\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce] 'Explorer' = '%WINDIR%\resources\themes\explorer.exe RO'
[<HKLM>\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce] 'Svchost' = '%WINDIR%\resources\svchost.exe RO'
Creates or modifies the following files
Creates the following services
[<HKLM>\SYSTEM\CurrentControlSet\Services\Schedule] 'Start' = '00000002'
Malicious functions
To complicate detection of its presence in the operating system,
forces the system hide from view:
Modifies file system
Creates the following files
%WINDIR%\resources\themes\explorer.exe
%WINDIR%\resources\spoolsv.exe
%WINDIR%\resources\svchost.exe
Sets the 'hidden' attribute to the following files
%WINDIR%\resources\themes\explorer.exe
%WINDIR%\resources\spoolsv.exe
%WINDIR%\resources\svchost.exe
Miscellaneous
Searches for the following windows
ClassName: 'Progman' WindowName: ''
Creates and executes the following
'%WINDIR%\resources\themes\explorer.exe'
'%WINDIR%\resources\spoolsv.exe' SE
'%WINDIR%\resources\svchost.exe'
'%WINDIR%\resources\spoolsv.exe' PR
'%WINDIR%\resources\themes\explorer.exe' ' (with hidden window)
'%WINDIR%\resources\spoolsv.exe' SE' (with hidden window)
'%WINDIR%\resources\svchost.exe' ' (with hidden window)
'%WINDIR%\resources\spoolsv.exe' PR' (with hidden window)
'%WINDIR%\explorer.exe' ' (with hidden window)
'%WINDIR%\syswow64\schtasks.exe' /create /tn "svchost" /tr "%WINDIR%\resources\svchost.exe" /sc daily /st 03:04 /f' (with hidden window)
'%WINDIR%\syswow64\schtasks.exe' /create /tn "svchost" /tr "%WINDIR%\resources\svchost.exe" /sc daily /st 03:05 /f' (with hidden window)
Executes the following
'%WINDIR%\explorer.exe'
'%WINDIR%\syswow64\schtasks.exe' /create /tn "svchost" /tr "%WINDIR%\resources\svchost.exe" /sc daily /st 03:04 /f
'%WINDIR%\syswow64\schtasks.exe' /create /tn "svchost" /tr "%WINDIR%\resources\svchost.exe" /sc daily /st 03:05 /f
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