Individual skill

defense-log-analysis

Hunt for attacker activity in logs — auth, web, cloud, endpoint — with concrete queries and what to look for. Load for blue-team log/SIEM hunting, "analyze these logs", "find the attack", triage of auth/web/cloud logs, or building hunts. Signals: log files/SIEM, "what happened", IOC hunting.

skills/defense/defense-log-analysis/SKILL.md

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Last checked: Nov 7, 2026

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Repository stars (not skill ratings): 27
Repository last updated: Oct 14, 2026
License: MIT

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SKILL.mdcore · 2,580 bytes

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# Log analysis & threat hunting

## When it applies
You have logs (or a SIEM) and need to find attacker activity — during triage, IR, or proactive
hunting. Pairs with each offensive skill: know the attack, hunt its footprint.

## Why it works
Attacks leave patterns across log sources. Hunting hypothesis-first (pick a technique → query its
signature → pivot on hits) beats scrolling. The same ATT&CK technique shows up in auth, web, cloud,
and endpoint logs in characteristic ways.

## Method — by source, what to look for
1. **Authentication**: spikes of 4625/failed logins then a 4624 success (brute force → `web-rate-limit-bypass`);
   logins from new geos/ASNs/impossible travel; new/again-enabled accounts; MFA fatigue (many prompts).