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Win32.HLLW.Autoruner2.52681
Added to the Dr.Web virus database:
2019-07-18
Virus description added:
2019-07-22
Technical Information
To ensure autorun and distribution
Modifies the following registry keys
[<HKCU>\software\Microsoft\Windows\CurrentVersion\Run] '812f3ff4423794267dbe4716fd18a376' = '"%TEMP%\csrss.exe" ..'
[<HKLM>\software\Microsoft\Windows\CurrentVersion\Run] '812f3ff4423794267dbe4716fd18a376' = '"%TEMP%\csrss.exe" ..'
Creates or modifies the following files
%HOMEPATH%\start menu\programs\startup\812f3ff4423794267dbe4716fd18a376.exe
Creates the following files on removable media
<Drive name for removable media>:\812f3ff4423794267dbe4716fd18a376.exe
<Drive name for removable media>:\autorun.inf
Malicious functions
To bypass firewall, removes or modifies the following registry keys
[<HKLM>\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '%TEMP%\csrss.exe' = '%TEMP%\csrss.exe:*:Enabled:csrss.exe'
To complicate detection of its presence in the operating system,
forces the system hide from view:
Executes the following
'<SYSTEM32>\netsh.exe' firewall add allowedprogram "%TEMP%\csrss.exe" "csrss.exe" ENABLE
Modifies file system
Creates the following files
Sets the 'hidden' attribute to the following files
<Drive name for removable media>:\812f3ff4423794267dbe4716fd18a376.exe
<Drive name for removable media>:\autorun.inf
%TEMP%\csrss.exe
%HOMEPATH%\start menu\programs\startup\812f3ff4423794267dbe4716fd18a376.exe
Miscellaneous
Creates and executes the following
'%TEMP%\csrss.exe'
'<SYSTEM32>\netsh.exe' firewall add allowedprogram "%TEMP%\csrss.exe" "csrss.exe" ENABLE' (with hidden window)
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