SecuLetter MARS SLF is a file security solution designed to detect and block content-based security threats and malware embedded in non-executable files before they enter internal systems. The product performs assembly-level analysis through reverse engineering techniques, including memory analysis, SEH chain analysis, and CPU register analysis. The solution analyzes non-executable document files (HWP, MS Office, PDF), image files (BMP, JPEG, PNG, GIF), and compressed files (ZIP, ARJ, RAR, TGA) without file size limitations. It identifies and detects evasive threats that sandbox-based solutions may miss by examining active content such as URLs, macros, JavaScript, and shellcode embedded within documents. MARS SLF is optimized for deployment in network separation environments, integration with network relay systems, document centralization solutions, and file upload points such as web bulletin boards. The product supports SMB, NFS, and SSH (SFTP) protocols for file system integration. The solution includes an add-on component called MARS SLCDR (Content Disarm and Reconstruction) that combines traditional CDR technology with automated reverse engineering-based malware analysis. This component identifies active content within documents, removes executable elements, and reassembles clean documents to prevent attacks. The system provides administrator alerts upon malware detection and offers intuitive management reports for operational oversight.