SecuLetter Logo Deep Email Threat Detection Most security tools only see the tip of the iceberg. Traditional AV, EDR and SEGs stop only known threats. SecuLetter performs assembly-level reverse-engineering and advanced sandboxing to uncover evasive, zero-day and file-borne attacks before they execute.
SecuLetter Email Security Solutions

Why Existing Solutions Are Insufficient

Known threats are caught by signatures. Sandboxes and behavior engines catch some unknowns — but sophisticated attacks use VM evasion, memory corruption, obfuscation and crafted exploits that hide until execution. SecuLetter inspects at the instruction/assembly level to reveal what others miss.

  • Known Threats: Signature-based detection (AV, EDR)
  • Unknown Threats: Sandbox & behavior-based detection
  • Hidden Threats: Assembly-level evasive attacks

SecuLetter's reverse-engineering pipeline detaches and analyzes machine instructions in real time, detecting memory manipulation, persistence, and evasion attempts before the payload runs — giving you true protection against zero-day and weaponized attachments.

Security Categories

Deep Threat Analysis

Assembly-level reverse engineering and instruction monitoring to detect evasive and unknown attacks that bypass traditional tools.

Zero-day & Exploit Defense

Real-time detection and neutralization of weaponized attachments, macro malware, and file-borne zero-day exploits.

Multi-layered Analysis Pipeline

Integrated static, dynamic, AI/CTI, sandbox, CDR and reverse-engineering analyses to minimize false positives and maximize detection accuracy.

Flexible Deployment

Supported deployments include on-prem appliances (SLE), inline SaaS (SLES), and cloud-native DISARM for Microsoft 365 / Gmail.

SecuLetter — Cloud Advanced Email Security (SLES)

Delivering clean, safe email instantly — before users click.

SecuLetter detects and neutralizes advanced email threats that standard SEGs miss — using reverse-engineering, sandboxing, and CDR to ensure safe delivery with no end-user disruption.

  • Real-time email defense — Catch zero-day exploits, macro malware, and weaponized attachments missed by conventional SEGs.
  • Assembly-level reverse engineering — Inspect instructions and VM behavior to uncover evasive techniques before execution.
  • Seamless experience — Clean emails delivered instantly with minimal latency and no manual intervention.

Key Features & Benefits

SecuLetter Features

SecuLetter combines high-fidelity static, dynamic and reverse-engineering analyses with Content Disarm & Reconstruction (CDR) to remove active exploit content and rebuild safe files — all at high speed and low latency.

  • 1. Assembly-Level Diagnosis
    • Inspect machine instructions to detect obfuscation, memory corruption, and persistence attempts
    • Significantly reduce false positives and false negatives compared to legacy sandboxes
  • 2. Multi-layered Protection
    • Static and dynamic analysis
    • Reverse-engineering engine
    • AI & threat intelligence correlation
    • PE and executable analysis
    • Password-protected and nested file handling
    • Content Disarm & Reconstruction (CDR)
  • 3. Faster, Safer Scans
    • Runs up to 5× faster than legacy APT sandboxes
    • Designed for high throughput with low impact to mail flow
  • 4. Neutralize Evasion Techniques
    • Detects VM evasion, script decoding, and other advanced hiding techniques

Product Lineup & Deployment Options

Flexible product choices for different environments and risk profiles.

SecuLetter Onboarding

Email Security (Appliance & SaaS)

  • SLE (Secure Email Gateway - Appliance) — SLE1000 (Entry), SLE3000 (Mid), SLE5000 (High-end)
  • SLES (Data-center Hosting / Inline SaaS) — Lightweight inline solution for cloud email
  • DISARM — Microsoft 365 & Gmail native integration (CDR & disarm mode)

File Security & CDR Appliances

  • SLF (Secure File Gateway) — SLF450 (Entry), SLF900 (Mid), SLF1800 (High-end)
  • SLCDR (Content Disarm & Reconstruction) — SLCDR450, SLCDR900, SLCDR1800
  • Flexible Licensing — Appliance, per-user SaaS, or hybrid deployment
SecuLetter

Trusted Partnership: NKH Solution & SecuLetter

Official SecuLetter certified partner — delivering reverse-engineering based email defense, CDR and integrations with SEGs, firewalls and cloud email platforms.

SecuLetter is trusted across government, defense, finance, manufacturing and critical infrastructure worldwide.