KRSID Ransomware Mass File Encryption Activity (.krsid extension)

Ibrahim Saud@tektrix

•updated Sep 20, 2026•1•0•4

This rule detects mass file modification, creation, or renaming activity involving files with the '.krsid' extension. The threshold is set to monitor for more than 20 occurrences, which is indicative of potential ransomware encryption activity, while explicitly excluding common system, temporary, and development paths, and filtering out processes explicitly performing shadow copy deletion.