The Only Cybersecurity Newsletter That Ships Sigma Detection Rules With Every Post

The gap between threat description and defensive action is where most intelligence gets lost. A practitioner reads that a critical CVE is being actively exploited, then spends 45 minutes writing a detection rule from scratch, translating the ATT&CK technique into a platform-specific query, and manually extracting IOCs into a format their SIEM can ingest. That 45 minutes is the actual cost of a newsletter that describes without delivering.

Decryption Digest eliminates that gap. Every post that describes an actively exploited threat also ships the Sigma rules to detect it, the WAF configurations to block it at the network layer, and the structured IOCs to feed directly into threat intelligence platforms and SIEM blocklists. Practitioners read the briefing and have everything they need to act before 9am.

Decryption Digest is a free daily threat intelligence briefing that ships Sigma detection rules in 8 vendor formats alongside every applicable post. The detection rule pipeline runs in parallel with editorial production: as the threat intelligence is authored, Sigma rules are generated, translated across vendor backends, and attached to the post as subscriber-gated content available the same morning the briefing delivers.

Sigma vendor backends included with every applicable post: Splunk SPL, Elastic KQL and EQL, Microsoft Sentinel KQL (Log Analytics workspace), CrowdStrike Falcon Query Language (FQL), Google Chronicle YARA-L 2.0, IBM QRadar AQL, Suricata rules (network-layer detection), and generic Sigma YAML (universal format for any compatible platform).

WAF rules are included with network-layer threats for ModSecurity, Cloudflare WAF, AWS WAF, and Azure WAF. Structured IOCs ship with every post: IP addresses and CIDR ranges (C2 infrastructure), domains and subdomains (phishing, C2, malware delivery), file hashes (MD5, SHA-1, SHA-256), YARA signatures for file-based indicators, and ATT&CK technique IDs.

Subscribers access detection rules and IOCs through the full blog post. The paid portal adds vendor-native detection queries written directly in each platform's native language, paste-ready without Sigma translation: Splunk SPL, Elastic KQL and EQL, Microsoft Sentinel KQL, CrowdStrike FQL, Chronicle YARA-L 2.0, and QRadar AQL, plus mitigation configurations for seven firewall and WAF vendors.

A SOC analyst's morning workflow with Decryption Digest looks different from a newsletter that only describes threats. The analyst reads the daily briefing in the first 10 minutes of the morning and gets the threat context: what is being exploited, by whom, against which sectors, with what technique chain.

They then open the full post and access the subscriber-gated detection rules. For a host-based attack, they get Splunk SPL that queries Windows Security Event logs for the specific behavior pattern, Elastic EQL for the same detection, and Microsoft Sentinel KQL using the SecurityEvent table. They copy the rule for their platform and paste it directly into their SIEM. No rewriting from an ATT&CK description. No translating a generic indicator into a platform-specific query. One copy-paste operation.

For network-layer threats, WAF rules ship alongside the detection content. A CVE in a web application framework comes with a ModSecurity rule that blocks the exploit pattern at the WAF level, and a Cloudflare WAF expression for organizations using Cloudflare as their edge provider.

Paid portal subscribers get an additional layer: vendor-native queries for detect, hunt, mitigate, prevent, and respond categories, each written in the target platform's native query language by practitioners who know the platform's telemetry schema and field naming conventions.

The evaluation criteria for a threat intelligence source changes when detection rule delivery is on the table. The relevant questions shift from 'does this newsletter cover the threats we care about?' to 'does it give us what we need to act on those threats without additional analyst work?'

For vulnerability management teams, the relevant metric is time from threat disclosure to deployed detection rule. With a source that only describes threats, that time includes analyst research, rule authoring, platform-specific translation, and peer review. With Decryption Digest, it is the time to read the post, copy the rule, and paste it.

For security leaders evaluating the ROI of a threat intelligence subscription, the calculation includes analyst time. If an analyst spends 30 minutes per threat writing detection rules that Decryption Digest delivers ready-to-deploy, and the analyst covers 5 threats per week, the weekly time saving is 2.5 hours of analyst capacity redirected from rule authoring to threat investigation. Over a year, that is more than 100 hours of recovered analyst time per analyst from a single free daily briefing.

Subscribe to Decryption Digest free at decryptiondigest.com/newsletter and access detection rules in 8 vendor formats, WAF configurations, and structured IOCs with every applicable post.