Purple › Module 3 › Lesson 4
Lab — DE Basics
Pack detection-as-code, telemetry needs, and false positive cost cards — DE basics file from $PURPLE_LAB only.
Visual · t35_de_basics_lab
Lab: DE basics pack. $PURPLE_LAB only. Original Cyberlium.
Opening
DE basics pack merges DaC to telemetry to FP cost — paperwork before Sigma module.
Lessons 3-1–3-3 named detection-as-code, telemetry needs, and false positive cost. This lab merges three sections into one $PURPLE_LAB DE artifact with M1 ethics and M2 concepts cross-references. No stranger-network sims or unauthorized log collection — detection engineering paperwork only. Next: Quiz — Detection Engineering Basics.
1. Lab contract: DE basics pack
Create $HOME/cyberlium-lab/t35-m03-l04-de-basics-lab.txt merging detection-as-code, telemetry needs, and false positive cost sections with $PURPLE_LAB fictional T1059 rule and M1/M2 cross-references.
Optional: link telemetry row to lab host from M1 inventory.
Command guide
Try these commands — Lab contract: DE basics pack
═══ TOOLS & WEBSITES ═══ Browse / read these (authorized learning only — stay in YOUR lab / program scope)
Sigma — https://sigmahq.io/ Elastic detection — https://www.elastic.co/guide/en/security/current/rules-ui.html MITRE ATT&CK — https://attack.mitre.org/
═══ INSTALL ═══
Linux (Debian/Ubuntu):
Command — copy this
sudo apt install python3
macOS:
Command — copy this
brew install python3
Windows: Download https://python.org/downloads/
═══ LINUX / macOS ═══
Command — copy this
export PURPLE_LAB=${PURPLE_LAB:-$HOME/cyberlium-lab/t35-purple}
cat > "$PURPLE_LAB/notes/de-basics-lab-summary.md" <<'EOF'
# Detection Engineering Basics Lab — YOUR lab
- detection-as-code.txt: version control + review + test
- telemetry-needs.md: log sources per ATT&CK technique
- false-positive-cost.txt: tuning literacy
## Next
- Write failed-logon Sigma stub in rules/ (Module 4)
- Seed auth.jsonl and jq-validate (Module 5)
## Refusals
- No credential dump atomics; no stranger-network sims
EOFCommand — copy this
grep -E 'failed-logon|Refusals|auth.jsonl' "$PURPLE_LAB/notes/de-basics-lab-summary.md" ls "$PURPLE_LAB/notes/"
═══ WINDOWS ═══
Command — copy this
Get-Content $HOME/cyberlium-lab/t35-purple/notes/telemetry-needs.md | Select-String T1110
Primary tools to practice this lesson: grep, python3. Reference sites: Sigma (https://sigmahq.io/); Elastic detection (https://www.elastic.co/guide/en/security/current/rules-ui.html); MITRE ATT&CK (https://attack.mitre.org/). Run every command in the box — install first, then the usage lines — only on YOUR lab / program scope.
2. Cross-check ethics
Grep for live victim logs, stranger-network refs, production secrets — remove. Confirm all examples use $PURPLE_LAB fictional data.
Rule examples use placeholder paths — no real credentials.
3. Lock the proof
chmod 600 on the pack. Quiz next — then Sigma Named.
DE basics literacy feeds Sigma and SIEM lessons in M4.
4. What you ship: DE basics pack for $PURPLE_LAB
Merged DaC, telemetry, FP sections. $PURPLE_LAB named. NO stranger sims. chmod 600.
5. What you record before the next lesson
Date. DE basics pack path. $PURPLE_LAB named. File t35-m03-l04-de-basics-lab.txt chmod 600.
6. Wrong vs right: stranger networks vs YOUR purple lab
Worked failure — same MSF word, opposite target. Right never needs a café Wi-Fi or classmate laptop.
Wrong
Include live victim log samples. Skip telemetry needs section.
Right
Write YOUR DE basics pack for $PURPLE_LAB. chmod 600. Next: Quiz — Detection Engineering Basics.
Mission: freeze YOUR DE basics pack on disk
1) Merge M3 literacy sections. 2) Confirm zero live victim or stranger-network refs. 3) Link M1/M2 cross-refs. 4) chmod 600.
Stuck? Ask Cyberlium AI Mentor
One governed DE pack beats ten untested SIEM console clicks.
Knowledge Check
APPLY: This lab requires:
Multiple choice
Knowledge Check
APPLY: True or False: DE basics pack must use fictional lab host placeholders.
True or False
Knowledge Check
APPLY: DE basics pack supports:
Multiple choice