Technical Information
To ensure autorun and distribution:
Modifies the following registry keys:
- [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'Isass.exe' = '"%APPDATA%\Winzip\Isass.exe" ..'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'Isass.exe' = '"%APPDATA%\Winzip\Isass.exe" ..'
Creates the following files on removable media:
- <Drive name for removable media>:\chrome.exe
Malicious functions:
To bypass firewall, removes or modifies the following registry keys:
- [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '%APPDATA%\winzip\Isass.exe' = '%APPDATA%\winzip\Isass.exe:*:Enabled:Is...
Executes the following:
- '<SYSTEM32>\netsh.exe' firewall add allowedprogram "%APPDATA%\Winzip\Isass.exe" "Isass.exe" ENABLE
Modifies file system:
Creates the following files:
- %APPDATA%\winzip\Isass.exe
Sets the 'hidden' attribute to the following files:
- <Drive name for removable media>:\chrome.exe
- <Full path to file>
Network activity:
Connects to:
- 'sa##.#yq-see.com':2453
UDP:
- DNS ASK sa##.#yq-see.com
Miscellaneous:
Searches for the following windows:
- ClassName: 'Shell_traywnd' WindowName: ''
Creates and executes the following:
- '%APPDATA%\winzip\Isass.exe'
