본문으로 건너뛰기
cccskills
무료GitHub에 공개

writing-suricata-and-snort-rules

Writes and validates Suricata/Snort IDS rules for network-based malware detection, covering rule anatomy, content/pcre matching, flow and threshold options, and common mistakes that cause false positives or no matches. Activates for requests to write a Suricata rule, create Snort signatures, or build network detection rules from IOCs or C2 patterns.

한국어 요약은 준비 중입니다. 원문 설명을 표시하고 있습니다.

설치 방법 보기

포함된 파일(4)

  • SKILL.md2.8 KB
  • LICENSE340 B
  • references/api-reference.md1.1 KB
  • scripts/analyst.py2.8 KB

SKILL.md(원문)

설치하기 전에 에이전트에게 전달되는 지시 내용을 확인할 수 있습니다.

Writing Suricata and Snort Rules

When to Use

  • You need to author IDS rules to detect C2 traffic, malware downloads, or exploit attempts from observed network indicators.
  • You want to validate rule syntax and avoid the patterns that cause false positives or silent non-matching.

Do not use broad content matches on common substrings that will flood alerts — anchor with flow direction, ports, offsets, and uniqueness. This skill builds and lints rules; deploy them through your IDS change process.

Prerequisites

  • The indicators to detect (URI, host header, TLS SNI/JA3, byte pattern) and a target IDS (Suricata or Snort).

Workflow

Step 1: Draft the rule

Choose action, protocol, addresses/ports, direction, and a unique msg, sid, and rev. Add content/pcre matches anchored with http.uri, tls.sni, flow:established,to_server, and offsets/depths.

Step 2: Lint the rule

python scripts/analyst.py lint rules.rules

Checks for required fields (msg, sid, rev, classtype), balanced quotes/parentheses, non-anchored overly short content, and duplicate SIDs.

Step 3: Tune to reduce noise

Add threshold/detection_filter, flowbits, and specific buffers (http.host, dns.query) to scope matches.

Step 4: Document and stage

Record what each rule detects and stage it for testing against a pcap before production.

Validation

  • Every rule has msg, a unique sid, and a rev.
  • content matches are anchored (buffer/offset/flow) rather than free-floating short strings.
  • Rules parse without unbalanced quotes/parentheses.

Pitfalls

  • Free-floating content:"GET" style matches creating massive false positives.
  • Duplicate or reused SIDs causing rule-load conflicts.
  • Forgetting flow:established and matching on unrelated traffic directions.

References

리뷰

아직 리뷰가 없습니다. 사용해 본 소감을 남겨 주세요.

댓글

로그인 없이 쓸 수 있습니다. 사용 후기, 질문, 작동하지 않은 환경 등을 편하게 남겨 주세요.

아직 댓글이 없습니다. 첫 댓글을 남겨 보세요.

보내면 바로 공개됩니다. 이메일 주소나 전화번호 같은 개인 정보는 쓰지 마세요. URL은 2개까지입니다.

0 / 1,000자

이 양식은 reCAPTCHA로 보호되며 Google 개인정보처리방침 및 서비스 약관이 적용됩니다.

같은 저장소의 스킬

Reverses Android malware: unpacking APKs, decompiling DEX bytecode to readable Java, auditing the manifest for abused permissions and components, and locating dynamically loaded or native payloads. Activates for requests to analyze an APK, decompile DEX, or investigate a suspicious Android app.

한국어 요약은 준비 중입니다. 원문 설명을 표시하고 있습니다.

meltedinhex/analyst-ai-pack222026년 7월 7일 업데이트

Analyzes API call traces from a sandbox or API monitor (JSON) to group calls by category, reconstruct high-level behaviors (process injection, file drops, network, crypto), and flag suspicious call sequences. Activates for requests to analyze an API trace, interpret sandbox API logs, or identify behavior from Win32/Native API calls.

한국어 요약은 준비 중입니다. 원문 설명을 표시하고 있습니다.

meltedinhex/analyst-ai-pack222026년 7월 7일 업데이트

Analyzes Windows Authenticode signatures on PE files: checking for a signature, reading the signer certificate chain, detecting revoked/expired/stolen certs, and recognizing signature-stripping and catalog-signing abuse. Activates for requests to analyze a code signature, verify Authenticode, or assess signer trust on a PE.

한국어 요약은 준비 중입니다. 원문 설명을 표시하고 있습니다.

meltedinhex/analyst-ai-pack222026년 7월 7일 업데이트

Analyzes banking trojan webinject configurations to extract targeted institutions, injected JavaScript/HTML, and data-theft hooks, mapping the fraud workflow. Activates for requests to analyze banking trojan webinjects, parse a webinject config, or map targeted banks and credential-theft injections.

한국어 요약은 준비 중입니다. 원문 설명을 표시하고 있습니다.

meltedinhex/analyst-ai-pack222026년 7월 7일 업데이트

Analyzes Python-based malware packaged as PyInstaller/py2exe executables by detecting the packer, locating the embedded archive, and identifying bundled .pyc modules for extraction and decompilation. Activates for requests to analyze compiled Python malware, unpack a PyInstaller binary, or extract pyc modules from a frozen Python executable.

한국어 요약은 준비 중입니다. 원문 설명을 표시하고 있습니다.

meltedinhex/analyst-ai-pack222026년 7월 7일 업데이트

Analyzes cryptojacking/coinminer malware by extracting mining pool endpoints (stratum), wallet addresses, algorithm and miner identifiers (XMRig and forks), and persistence or resource-control settings from static strings and config. Activates for requests to analyze a cryptominer, extract mining pool and wallet IOCs, or identify coinminer configuration.

한국어 요약은 준비 중입니다. 원문 설명을 표시하고 있습니다.

meltedinhex/analyst-ai-pack222026년 7월 7일 업데이트

meltedinhex의 스킬 모두 보기

이 스킬의 문제 신고