![]() ![]() TAG said Russian-linked Sandworm and APT28 gangs are abusing this appended space WinRAR exploit, with both using it against Ukrainian targets, among others. ![]() ![]() In Google's example, a file named "poc.png_" (with the underscore representing the appended space) is the original item the user selected, but WinRAR also expands an identically named directory "poc.png_/" and an identically-named file that's actually a shell script: poc.png_.cmd. "ShellExecute attempts to identify file extensions by calling 'shell32!PathFindExtension' which fails because extensions with spaces are considered invalid." Instead of giving up, "ShellExecute proceeds to call "shell32!ApplyDefaultExts" which iterates through all files in a directory, finding and executing the first file with an extension matching any of the hardcoded ones," such as.
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