[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"skill:01M6AEVPSDBD7R3ZNYHB4G36XY":3,"skill-same:01M6AEVPSDBD7R3ZNYHB4G36XY":122},{"skillNo":4,"name":5,"nameZh":6,"description":7,"descriptionZh":6,"repositoryFullName":8,"ownerLogin":9,"ownerAvatarUrl":10,"ownerAccountNo":11,"ownerDisplayName":12,"repositoryNo":13,"starsCount":14,"licenseSpdxId":15,"licenseFileUrl":6,"sourceHtmlUrl":16,"categories":17,"keywords":18,"publishedAt":39,"linkOnly":40,"markdownContent":41,"markdownBody":42,"frontMatter":43,"refName":65,"commitSha":66,"skillDirectory":67,"forksCount":68,"repositoryHtmlUrl":69,"repositoryHomepageUrl":70,"ownerHtmlUrl":71,"ownerBlogUrl":72,"ownerDescription":73,"updatedAt":74,"install":75,"resources":88},"01M6AEVPSDBD7R3ZNYHB4G36XY","hunting-for-domain-fronting-c2-traffic",null,"Detects domain fronting C2 traffic by analyzing SNI-vs-HTTP-Host-header mismatches in proxy logs and inspecting TLS certificate discrepancies with pyOpenSSL. Use when hunting for command-and-control traffic hidden behind legitimate CDN domains, or when investigating proxy\u002FTLS logs for signs of domain fronting evasion.","mukul975\u002FAnthropic-Cybersecurity-Skills","mukul975","https:\u002F\u002Favatars.githubusercontent.com\u002Fu\u002F42860185?v=4","01M6ADEQR8T5M4EEG6C67BQCWF","Mahipal","01M6ADJPMYWG1E5GM1FWBE3128",35990,"Apache-2.0","https:\u002F\u002Fgithub.com\u002Fmukul975\u002FAnthropic-Cybersecurity-Skills\u002Fblob\u002Fmain\u002Fskills\u002Fhunting-for-domain-fronting-c2-traffic\u002FSKILL.md",[],[19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38],"hunting for domain fronting c2 traffic","c2","analyzing","pyopenssl","tls-inspection","domain-fronting","proxy-logs","detection","tls","network-security","network","cybersecurity","command-and-control","threat-hunting","server","logs","cdn","proxy","protocol","http","2026-11-10 10:12:30",false,"---\nname: hunting-for-domain-fronting-c2-traffic\ndescription: Detects domain fronting C2 traffic by analyzing SNI-vs-HTTP-Host-header\n  mismatches in proxy logs and inspecting TLS certificate discrepancies with pyOpenSSL.\n  Use when hunting for command-and-control traffic hidden behind legitimate CDN domains,\n  or when investigating proxy\u002FTLS logs for signs of domain fronting evasion.\ndomain: cybersecurity\nsubdomain: threat-hunting\ntags:\n- domain-fronting\n- c2-detection\n- tls-inspection\n- proxy-logs\n- pyopenssl\n- threat-hunting\n- network-security\nversion: '1.0'\nauthor: mahipal\nlicense: Apache-2.0\nd3fend_techniques:\n- Application Protocol Command Analysis\n- Network Isolation\n- Network Traffic Analysis\n- Client-server Payload Profiling\n- Network Traffic Community Deviation\nnist_csf:\n- DE.CM-01\n- DE.AE-02\n- DE.AE-07\n- ID.RA-05\nmitre_attack:\n- T1046\n- T1057\n- T1082\n- T1083\n- T1071\n---\n\n# Hunting for Domain Fronting C2 Traffic\n\n## Overview\n\nDomain fronting (MITRE ATT&CK T1090.004) is a technique where attackers use different domain names in the TLS SNI field and the HTTP Host header to disguise C2 traffic behind legitimate CDN-hosted domains. This skill detects domain fronting by parsing proxy\u002Fweb gateway logs for SNI-Host header mismatches, analyzing TLS certificates for CDN provider identification, flagging connections where the SNI points to a high-reputation domain but the Host header targets an attacker-controlled domain, and correlating with known CDN provider IP ranges.\n\n\n## When to Use\n\n- When investigating security incidents that require hunting for domain fronting c2 traffic\n- When building detection rules or threat hunting queries for this domain\n- When SOC analysts need structured procedures for this analysis type\n- When validating security monitoring coverage for related attack techniques\n\n## Prerequisites\n\n- Web proxy or secure web gateway logs with SNI and Host header fields\n- Python 3.8+ with pyOpenSSL and cryptography libraries\n- TLS inspection enabled on proxy for Host header visibility\n- CDN provider IP range lists (CloudFront, Azure CDN, Cloudflare)\n\n## Steps\n\n1. Parse proxy logs for connections with both SNI and Host header fields\n2. Compare SNI domain against HTTP Host header for mismatches\n3. Extract TLS certificate Subject and SAN fields using pyOpenSSL\n4. Identify CDN-hosted connections via certificate issuer and IP ranges\n5. Flag high-confidence domain fronting where SNI and Host differ on CDN IPs\n6. Score alerts based on domain reputation differential\n7. Generate detection report with network flow context\n\n## Expected Output\n\nJSON report containing detected domain fronting indicators with SNI-Host pairs, certificate details, CDN provider identification, confidence scores, and MITRE ATT&CK technique mapping.\n","# Hunting for Domain Fronting C2 Traffic\n\n## Overview\n\nDomain fronting (MITRE ATT&CK T1090.004) is a technique where attackers use different domain names in the TLS SNI field and the HTTP Host header to disguise C2 traffic behind legitimate CDN-hosted domains. This skill detects domain fronting by parsing proxy\u002Fweb gateway logs for SNI-Host header mismatches, analyzing TLS certificates for CDN provider identification, flagging connections where the SNI points to a high-reputation domain but the Host header targets an attacker-controlled domain, and correlating with known CDN provider IP ranges.\n\n\n## When to Use\n\n- When investigating security incidents that require hunting for domain fronting c2 traffic\n- When building detection rules or threat hunting queries for this domain\n- When SOC analysts need structured procedures for this analysis type\n- When validating security monitoring coverage for related attack techniques\n\n## Prerequisites\n\n- Web proxy or secure web gateway logs with SNI and Host header fields\n- Python 3.8+ with pyOpenSSL and cryptography libraries\n- TLS inspection enabled on proxy for Host header visibility\n- CDN provider IP range lists (CloudFront, Azure CDN, Cloudflare)\n\n## Steps\n\n1. Parse proxy logs for connections with both SNI and Host header fields\n2. Compare SNI domain against HTTP Host header for mismatches\n3. Extract TLS certificate Subject and SAN fields using pyOpenSSL\n4. Identify CDN-hosted connections via certificate issuer and IP ranges\n5. Flag high-confidence domain fronting where SNI and Host differ on CDN IPs\n6. Score alerts based on domain reputation differential\n7. Generate detection report with network flow context\n\n## Expected Output\n\nJSON report containing detected domain fronting indicators with SNI-Host pairs, certificate details, CDN provider identification, confidence scores, and MITRE ATT&CK technique mapping.\n",{"name":5,"tags":44,"author":46,"domain":30,"license":15,"version":47,"nist_csf":48,"subdomain":32,"description":7,"mitre_attack":53,"d3fend_techniques":59},[24,45,23,25,22,32,28],"c2-detection","mahipal","1.0",[49,50,51,52],"DE.CM-01","DE.AE-02","DE.AE-07","ID.RA-05",[54,55,56,57,58],"T1046","T1057","T1082","T1083","T1071",[60,61,62,63,64],"Application Protocol Command Analysis","Network Isolation","Network Traffic Analysis","Client-server Payload Profiling","Network Traffic Community Deviation","main","54a798831d2266a3ca61ce68a7acb80b81160d57","skills\u002Fhunting-for-domain-fronting-c2-traffic",4395,"https:\u002F\u002Fgithub.com\u002Fmukul975\u002FAnthropic-Cybersecurity-Skills","https:\u002F\u002Fmahipal.engineer\u002FAnthropic-Cybersecurity-Skills\u002F","https:\u002F\u002Fgithub.com\u002Fmukul975","Mahipal.engineer","🔐 Cybersecurity | 💻 Dev | 📷 Street Photographer\r\n🎓 MSc | 📚 Research & AI Security","2026-08-31 12:32:44",{"source":8,"skillName":5,"commands":76,"prompt":86,"zipAvailable":87},[77,80,83],{"tool":78,"command":79},"npx","npx skills add mukul975\u002FAnthropic-Cybersecurity-Skills --skill hunting-for-domain-fronting-c2-traffic",{"tool":81,"command":82},"bunx","bunx skills add mukul975\u002FAnthropic-Cybersecurity-Skills --skill hunting-for-domain-fronting-c2-traffic",{"tool":84,"command":85},"pnpm","pnpm dlx skills add mukul975\u002FAnthropic-Cybersecurity-Skills --skill hunting-for-domain-fronting-c2-traffic","安装技能，技能地址：https:\u002F\u002Fgithub.com\u002Fmukul975\u002FAnthropic-Cybersecurity-Skills\u002Fblob\u002Fmain\u002Fskills\u002Fhunting-for-domain-fronting-c2-traffic\u002FSKILL.md",true,[89,94,100,104,108,112,116],{"path":90,"resourceType":90,"resourceTypeDesc":91,"sizeBytes":92,"sourceHtmlUrl":93},"LICENSE","许可证",11255,"https:\u002F\u002Fgithub.com\u002Fmukul975\u002FAnthropic-Cybersecurity-Skills\u002Fblob\u002Fmain\u002Fskills\u002Fhunting-for-domain-fronting-c2-traffic\u002FLICENSE",{"path":95,"resourceType":96,"resourceTypeDesc":97,"sizeBytes":98,"sourceHtmlUrl":99},"references\u002Fapi-reference.md","REFERENCE","参考文档",2120,"https:\u002F\u002Fgithub.com\u002Fmukul975\u002FAnthropic-Cybersecurity-Skills\u002Fblob\u002Fmain\u002Fskills\u002Fhunting-for-domain-fronting-c2-traffic\u002Freferences\u002Fapi-reference.md",{"path":101,"resourceType":96,"resourceTypeDesc":97,"sizeBytes":102,"sourceHtmlUrl":103},"references\u002Fcpp_docs.md",7507,"https:\u002F\u002Fgithub.com\u002Fshengdabai\u002FTony-Claude-Code-Skills\u002Fblob\u002Fmain\u002Fskills\u002Frghamilton3-dotfiles\u002Fdot_config\u002Fopencode\u002Fskills\u002Fcode-documenter\u002Freferences\u002Fcpp_docs.md",{"path":105,"resourceType":96,"resourceTypeDesc":97,"sizeBytes":106,"sourceHtmlUrl":107},"references\u002Fdart_flutter_docs.md",11350,"https:\u002F\u002Fgithub.com\u002Fshengdabai\u002FTony-Claude-Code-Skills\u002Fblob\u002Fmain\u002Fskills\u002Frghamilton3-dotfiles\u002Fdot_config\u002Fopencode\u002Fskills\u002Fcode-documenter\u002Freferences\u002Fdart_flutter_docs.md",{"path":109,"resourceType":96,"resourceTypeDesc":97,"sizeBytes":110,"sourceHtmlUrl":111},"references\u002Fjavascript_typescript_docs.md",5353,"https:\u002F\u002Fgithub.com\u002Fshengdabai\u002FTony-Claude-Code-Skills\u002Fblob\u002Fmain\u002Fskills\u002Frghamilton3-dotfiles\u002Fdot_config\u002Fopencode\u002Fskills\u002Fcode-documenter\u002Freferences\u002Fjavascript_typescript_docs.md",{"path":113,"resourceType":96,"resourceTypeDesc":97,"sizeBytes":114,"sourceHtmlUrl":115},"references\u002Fpython_docs.md",3347,"https:\u002F\u002Fgithub.com\u002Fshengdabai\u002FTony-Claude-Code-Skills\u002Fblob\u002Fmain\u002Fskills\u002Frghamilton3-dotfiles\u002Fdot_config\u002Fopencode\u002Fskills\u002Fcode-documenter\u002Freferences\u002Fpython_docs.md",{"path":117,"resourceType":118,"resourceTypeDesc":119,"sizeBytes":120,"sourceHtmlUrl":121},"scripts\u002Fagent.py","SCRIPT","脚本",6636,"https:\u002F\u002Fgithub.com\u002Fmukul975\u002FAnthropic-Cybersecurity-Skills\u002Fblob\u002Fmain\u002Fskills\u002Fhunting-for-domain-fronting-c2-traffic\u002Fscripts\u002Fagent.py",[123,154,178,205,230,257],{"skillNo":124,"name":125,"nameZh":6,"description":126,"descriptionZh":6,"repositoryFullName":8,"ownerLogin":9,"ownerAvatarUrl":10,"ownerAccountNo":11,"ownerDisplayName":12,"repositoryNo":13,"starsCount":14,"licenseSpdxId":15,"licenseFileUrl":6,"sourceHtmlUrl":127,"categories":128,"keywords":134,"publishedAt":39},"01M6AGDM3HJXTKXX15ZZ0ZVCJ3","verifying-build-provenance-with-slsa-sigstore","Verifies artifact signatures and SLSA provenance using Sigstore's cosign (verify, verify-attestation, verify-blob-attestation) and slsa-verifier (verify-artifact), enforcing keyless OIDC builder identity and source repo against SLSA Build levels. Use in CI\u002FCD before deploying artifacts, when consuming third-party attestations, establishing a SLSA Build L3 pipeline, or confirming provenance during incident response or admission control.","https:\u002F\u002Fgithub.com\u002Fmukul975\u002FAnthropic-Cybersecurity-Skills\u002Fblob\u002Fmain\u002Fskills\u002Fverifying-build-provenance-with-slsa-sigstore\u002FSKILL.md",[129],{"categoryNo":130,"categoryName":131,"taxonomyType":132,"taxonomyTypeDesc":133},"01JBSEEDCAT000000000000023","Skill与智能体开发","SCENARIO","使用场景",[135,136,137,138,139,30,140,141,142,143,144,145,146,147,148,149,150,151,152,153],"sigstore","provenance","slsa","verifying build provenance with slsa sigstore","security","incident response","identity","pr","code","artifacts","ci","supply-chain","pipeline","supply-chain-security","t1195","attestation","code-signing","cosign","keyless",{"skillNo":155,"name":156,"nameZh":6,"description":157,"descriptionZh":6,"repositoryFullName":8,"ownerLogin":9,"ownerAvatarUrl":10,"ownerAccountNo":11,"ownerDisplayName":12,"repositoryNo":13,"starsCount":14,"licenseSpdxId":15,"licenseFileUrl":6,"sourceHtmlUrl":158,"categories":159,"keywords":161,"publishedAt":39},"01M6AGDGBPWYVZ2F11GFKJ4HZ9","validating-tpm-measured-boot-attestation","Verifies TPM 2.0 measured-boot integrity and remote attestation with tpm2-tools -- reading PCRs (tpm2_pcrread), replaying the boot event log, generating and checking signed quotes (tpm2_quote\u002Ftpm2_checkquote), and sealing secrets to a PCR policy. Use to confirm a system booted trusted firmware\u002Fkernel for Zero Trust device posture, detect boot-chain tampering via PCR drift, or build a golden-value baseline for fleet attestation.","https:\u002F\u002Fgithub.com\u002Fmukul975\u002FAnthropic-Cybersecurity-Skills\u002Fblob\u002Fmain\u002Fskills\u002Fvalidating-tpm-measured-boot-attestation\u002FSKILL.md",[160],{"categoryNo":130,"categoryName":131,"taxonomyType":132,"taxonomyTypeDesc":133},[162,150,163,164,139,165,30,142,166,167,168,169,170,171,172,173,174,175,176,177],"boot","TPM","validating tpm measured boot attestation","policy","verification","ZeRO","firmware","Tools","measured-boot","PCR","integrity","secrets","remote-attestation","tpm2-tools","integrity-verification","trusted-computing",{"skillNo":179,"name":180,"nameZh":6,"description":181,"descriptionZh":6,"repositoryFullName":8,"ownerLogin":9,"ownerAvatarUrl":10,"ownerAccountNo":11,"ownerDisplayName":12,"repositoryNo":13,"starsCount":14,"licenseSpdxId":15,"licenseFileUrl":6,"sourceHtmlUrl":182,"categories":183,"keywords":188,"publishedAt":39},"01M6AGDCW0Y4FXZ3362GT1941M","validating-backup-integrity-for-recovery","Validates backup integrity through cryptographic hash verification, automated restore testing, corruption detection, and recoverability checks to confirm backups are reliable for disaster recovery and ransomware response. Use before relying on backups for recovery, when building post-backup validation pipelines, auditing backup infrastructure for compliance, or checking immutable\u002Fair-gapped backups for silent corruption or tampering.","https:\u002F\u002Fgithub.com\u002Fmukul975\u002FAnthropic-Cybersecurity-Skills\u002Fblob\u002Fmain\u002Fskills\u002Fvalidating-backup-integrity-for-recovery\u002FSKILL.md",[184,187],{"categoryNo":185,"categoryName":186,"taxonomyType":132,"taxonomyTypeDesc":133},"01JBSEEDCAT000000000000008","测试与质量",{"categoryNo":130,"categoryName":131,"taxonomyType":132,"taxonomyTypeDesc":133},[172,189,190,191,192,30,193,194,166,195,196,197,198,199,26,200,201,202,203,204],"backup","recovery","validating backup integrity for recovery","testing","infrastructure","validation","compliance","hash-verification","incident-response","ransomware","cryptocurrency","t1078","t1490","immutable","disaster-recovery","restore-testing",{"skillNo":206,"name":207,"nameZh":6,"description":208,"descriptionZh":6,"repositoryFullName":8,"ownerLogin":9,"ownerAvatarUrl":10,"ownerAccountNo":11,"ownerDisplayName":12,"repositoryNo":13,"starsCount":14,"licenseSpdxId":15,"licenseFileUrl":6,"sourceHtmlUrl":209,"categories":210,"keywords":212,"publishedAt":39},"01M6AGD9GBG2KZ336AE763J3WH","triaging-windows-with-kape","Runs KAPE (Kroll Artifact Parser and Extractor) to collect targeted forensic artifacts (registry hives, $MFT, event logs, prefetch, browser data) via Targets and parse them with Modules wrapping Eric Zimmerman's EZ Tools (PECmd, MFTECmd, RECmd). Use during early incident containment\u002Ftriage when full disk imaging is impractical but a defensible, parseable Windows artifact set is needed quickly, including at-scale remote collection.","https:\u002F\u002Fgithub.com\u002Fmukul975\u002FAnthropic-Cybersecurity-Skills\u002Fblob\u002Fmain\u002Fskills\u002Ftriaging-windows-with-kape\u002FSKILL.md",[211],{"categoryNo":130,"categoryName":131,"taxonomyType":132,"taxonomyTypeDesc":133},[213,214,215,30,216,217,34,218,219,220,221,222,223,224,225,226,169,227,228,229],"windows","kape","triaging windows with kape","registry","browser","windows-forensics","dfir","mft","mftecmd","data","prefetch","eric-zimmerman","digital-forensics","SET","collection","pecmd","artifact-collection",{"skillNo":231,"name":232,"nameZh":6,"description":233,"descriptionZh":6,"repositoryFullName":8,"ownerLogin":9,"ownerAvatarUrl":10,"ownerAccountNo":11,"ownerDisplayName":12,"repositoryNo":13,"starsCount":14,"licenseSpdxId":15,"licenseFileUrl":6,"sourceHtmlUrl":234,"categories":235,"keywords":237,"publishedAt":39},"01M6AGD5PW5J4EVZM958WD74ZQ","triaging-vulnerabilities-with-ssvc-framework","Triages and prioritizes vulnerabilities with CISA's Stakeholder-Specific Vulnerability Categorization (SSVC) decision tree, weighing exploitation status (via the CISA KEV catalog and FIRST EPSS API), technical impact, automatability, and mission prevalence to output Track\u002FTrack*\u002FAttend\u002FAct decisions. Use when prioritizing vulnerability scan results (OpenVAS, Nessus, Qualys) for remediation planning beyond raw CVSS scores.","https:\u002F\u002Fgithub.com\u002Fmukul975\u002FAnthropic-Cybersecurity-Skills\u002Fblob\u002Fmain\u002Fskills\u002Ftriaging-vulnerabilities-with-ssvc-framework\u002FSKILL.md",[236],{"categoryNo":130,"categoryName":131,"taxonomyType":132,"taxonomyTypeDesc":133},[238,239,240,30,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255,256],"vulnerabilities","framework","triaging vulnerabilities with ssvc framework","status","planning","CISA","vulnerability-management","risk-management","nessus","qualys","openvas","cvss","remediation","risk","vulnerability","api","prioritization","ssvc","decision-tree",{"skillNo":258,"name":259,"nameZh":6,"description":260,"descriptionZh":6,"repositoryFullName":8,"ownerLogin":9,"ownerAvatarUrl":10,"ownerAccountNo":11,"ownerDisplayName":12,"repositoryNo":13,"starsCount":14,"licenseSpdxId":15,"licenseFileUrl":6,"sourceHtmlUrl":261,"categories":262,"keywords":264,"publishedAt":39},"01M6AGD24TTQQM4CXG69E3B9TJ","triaging-security-incident","Performs initial triage of security incidents using the NIST SP 800-61r3 and SANS PICERL frameworks, classifying incident type, assigning priority by business impact, and routing to the appropriate response team. Use when a SIEM\u002FEDR alert needs human classification, concurrent alerts must be prioritized, or a user report or threat-intel IOC match requires initial incident categorization.","https:\u002F\u002Fgithub.com\u002Fmukul975\u002FAnthropic-Cybersecurity-Skills\u002Fblob\u002Fmain\u002Fskills\u002Ftriaging-security-incident\u002FSKILL.md",[263],{"categoryNo":130,"categoryName":131,"taxonomyType":132,"taxonomyTypeDesc":133},[139,265,30,266,267,268,269,270,271,272,273,200,274,201,275,276,277,278,279,280],"triaging security incident","siem","file","ioc","soc","NIST-800-61","NIST","severity","edr","execution","analysis","classification","severity-classification","incident-triage","SANS-PICERL","SOC-operations"]