Senior Threat Detection Engineer

Elastic is currently hiring for a Senior Threat Detection Engineer role, focusing on developing detection strategies to identify and mitigate cyber threats. This position is ideal for professionals skilled in analytics, threat intelligence, and response mechanisms.

You Should Know:

1. Key Responsibilities of a Detection Engineer

• Develop and fine-tune detection rules (SIEM, EDR, NDR).
• Analyze threat intelligence to improve detection capabilities.
• Automate detection workflows using scripting (Python, PowerShell).

2. Essential Tools & Technologies

• SIEMs: Elastic SIEM, Splunk, IBM QRadar
• EDR/XDR: CrowdStrike, Microsoft Defender ATP, Elastic Endgame
• Threat Intelligence Platforms: MISP, ThreatConnect, Anomali

3. Practical Detection Rule Examples

Elastic SIEM Detection Rule (YAML)

name: "Suspicious Process Execution - PowerShell Encoded Command" 
description: "Detects obfuscated PowerShell commands often used in attacks." 
risk_score: 80 
severity: "high" 
query: 
"process.name:powershell.exe AND process.args:/encodedcommand" 

Sigma Rule for Splunk

title: "Suspicious Scheduled Task Creation" 
description: "Detects malicious scheduled task creation." 
logsource: 
product: windows 
service: system 
detection: 
selection: 
EventID: 4698 
TaskName: "malicious" 
condition: selection 

1. Useful Linux & Windows Commands for Detection Engineers

Linux:

– `grep “suspicious_string” /var/log/auth.log` (Search for brute-force attempts)
– `journalctl -u sshd –since “1 hour ago”` (Check SSH logs)
– `tcpdump -i eth0 ‘port 53’` (Monitor DNS queries)

Windows:

– `Get-WinEvent -FilterHashtable @{LogName=’Security’; ID=4625}` (Failed logins)
– `schtasks /query /fo LIST /v` (List scheduled tasks)
– `netstat -ano | findstr ESTABLISHED` (Check active connections)

5. Threat Hunting with Command Line

• YARA for Malware Detection:

  yara -r malware_rules.yar /opt/suspicious_files 
  

• Log Analysis with AWK:

  awk '/Failed password/ {print $11}' /var/log/auth.log | sort | uniq -c 
  

6. Automating Threat Detection

• Python Script to Parse Logs:

  import re 
  with open('/var/log/syslog', 'r') as f: 
  for line in f: 
  if re.search('sshd.Failed', line): 
  print(line.strip()) 
  

7. Enhancing Detection with MITRE ATT&CK

• Map detections to Tactic IDs (e.g., T1059 for PowerShell attacks).
• Use Atomic Red Team to test detection rules:

  ./atomic-red-team execute -t T1059.001 
  

What Undercode Say

A Senior Detection Engineer must master SIEM rules, scripting, and log analysis. Practical knowledge of Elastic, Splunk, and EDR tools is crucial. Automation (Python, PowerShell) and familiarity with MITRE ATT&CK significantly improve detection efficiency.

Expected Output:

• Refined detection rules.
• Automated threat-hunting scripts.
• Enhanced security monitoring.

Relevant URL:

jobs.elastic.co

References:

Reported By: Dlacasse Senior – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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