andreacristaldi-DefenderRuleParser/Parsers/NscriptSpParser.cs

// DefenderRuleParser
// Author: Andrea Cristaldi 2025 - https://github.com/andreacristaldi/DefenderRuleParser
// This project is licensed under the Apache 2.0 License.
/*
 * Summary: NSCRIPT “SP” variant parser (scanning/probing flavored data).
 * Origin: dump-driven; record types and lengths derived from hex evidence.
 * Role: Formats command-like items for human review.
 */
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using DefenderRuleParser2.Models;

namespace DefenderRuleParser2.Parsers
{
    public class NscriptSpParser : ISignatureParser
    {
        public void Parse(BinaryReader reader, int size, uint threatId)
        {
            long offset = reader.BaseStream.Position;

            try
            {
                if (size != 14)
                {
                    Logger.Warn($"[NSCRIPT_SP] ! Unexpected size: {size} bytes. Expected: 14.");
                    return;
                }

                byte[] data = reader.ReadBytes(14);
                string hex = BitConverter.ToString(data).Replace("-", " ");

                Logger.Info($"[NSCRIPT_SP] Threat ID: {threatId}, Size: 14 bytes");
                Logger.Info($"  > Hex: {hex}");

                if (ThreatDatabase.TryGetThreat(threatId, out var threat))
                {
                    threat.Signatures.Add(new SignatureEntry
                    {
                        Type = "SIGNATURE_TYPE_NSCRIPT_SP",
                        Offset = offset,
                        Pattern = new List<string> { hex },
                        Parsed = true,
                        Logic = null,
                        ConditionType = "PRESENCE",
                        ConditionValue = 1
                    });
                }
            }
            catch (Exception ex)
            {
                Logger.Error($"[!] NSCRIPT_SP Error parsing at offset 0x{offset:X}: {ex.Message}");
            }
            finally
            {
                reader.BaseStream.Seek(offset + size, SeekOrigin.Begin);
            }
        }
    }
}