Senior Detection & Response Engineer: Building Next-Gen SOC Alerts

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Link: Expel Careers – Senior Detection & Response Engineer

You Should Know:

Key Responsibilities & Technical Workflow

A Senior Detection & Response Engineer at Expel designs high-fidelity alerts that automate threat intelligence enrichment, endpoint detection and response (EDR) analysis, and contextual event correlation. Below are critical commands and tools used in such roles:

1. Automated IP Enrichment (Command Line & Tools)

 Use WHOIS and GeoIP lookup for attacker IP analysis 
whois <ATTACKER_IP> 
curl ipinfo.io/<ATTACKER_IP>/json

Python Script for Bulk Enrichment:

import requests 
def enrich_ip(ip): 
response = requests.get(f"https://ipapi.co/{ip}/json/") 
return response.json() 
print(enrich_ip("8.8.8.8"))  Example: Google DNS

2. EDR (Endpoint Detection & Response) Queries

  • Windows (Microsoft Defender ATP): 
    Get-MpThreatDetection -ThreatID <ID> | Format-List
  • Linux (Auditd for Process Tracing): 
    ausearch -k "malicious_process" | aureport -f -i

3. SOC Alert Automation (Splunk/Sigma Rules)

Example Sigma Rule for detecting suspicious process execution:

title: Suspicious PowerShell Execution 
description: Detects PowerShell with hidden window 
logsource: 
product: windows 
service: powershell 
detection: 
selection: 
CommandLine: " -WindowStyle Hidden " 
condition: selection

4. Log Aggregation & SIEM Queries

  • Elasticsearch Query for Alert Context: 
    GET /alerts/_search 
{ 
"query": { 
"bool": { 
"must": [ 
{ "match": { "ip": "<ATTACKER_IP>" } }, 
{ "range": { "@timestamp": { "gte": "now-1h" } } } 
] 
} 
} 
}

5. Incident Response Playbook (Sample Steps)

1. Triage Alert:

grep "critical_alert_id" /var/log/soc/alerts.log

2. Isolate Host (Linux):

iptables -A INPUT -s <MALICIOUS_IP> -j DROP

3. Memory Forensics (Volatility):

volatility -f memory.dump pslist

What Undercode Say

A next-gen Detection & Response Engineer merges threat intelligence, automation, and forensic analysis to reduce SOC workload. Mastery of EDR tools, SIEM queries, and scripting is non-negotiable. Expel’s role emphasizes contextual alerting, a trend moving toward AI-driven SOCs with automated remediation.

Expected Output:

  • Faster MTTR (Mean Time to Respond) via enriched alerts.
  • Reduced false positives with Sigma rules and behavioral analytics.
  • Integration of threat feeds (e.g., MISP, AlienVault OTX) into detection pipelines.

Prediction

SOC roles will evolve into AI-augmented analysts, where engineers design self-healing detection systems using LLM-driven log analysis (e.g., ChatGPT for log parsing). Expel’s job posting hints at this shift—automation-first threat hunting is the future.

Relevant URL: Expel Careers

References:

Reported By: Bradystouffer Careers – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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