Gootloader now uses 1,000-part ZIP archives for stealthy delivery

The Gootloader malware is now employing a stealthy delivery method using 1,000-part ZIP archives that are malformed to evade detection by analysis tools, while still being unpackable by Windows' default utility. This technique involves concatenating numerous ZIP files and introducing metadata mismatches to break common parsing tools, and defenders can spot this threat by looking for specific ZIP header features and repeating file headers.