We are seeking a hands-on

Senior Cybersecurity Specialist with strong experience in threat detection, incident response, email security, and vulnerability management. The role will focus on investigating complex security incidents, threat hunting, email/BEC investigations, vulnerability risk prioritization, and driving remediation across enterprise environments.

Key Responsibilities

- Investigate and respond to security incidents using

SentinelOne EDR or equivalent platforms.

- Perform threat hunting, malware analysis, IOC/TTP analysis, root-cause analysis, and incident containment.

- Investigate phishing, spear-phishing and BEC incidents using

Abnormal Security, Microsoft Defender for Office 365, Exchange Online, and Microsoft 365

.

- Analyze email headers, URLs, attachments, SPF, DKIM and DMARC configurations.

- Assess and prioritize vulnerabilities using

Tanium or equivalent vulnerability-management platforms.

- Evaluate CVSS, exploitability,



exposure and business impact to determine remediation priority.

- Partner with infrastructure and application teams to drive vulnerabilities through remediation and closure.

- Produce clear technical investigation reports, risk assessments, and executive-level security reporting.

Required Skills

- 5–8+ years in Cybersecurity Operations, Incident Response, Threat Hunting or Vulnerability Management.

- Strong hands-on experience with

SentinelOne/EDR, Abnormal Security or email-security platforms, and Tanium or equivalent

.

- Robust knowledge of

MITRE ATT&CK;, IOC/TTP analysis, malware analysis, BEC/phishing investigations and CVSS

.

- Experience with

Microsoft 365, Defender for Office 365, Exchange Online and Azure AD/Entra ID security

.

- Strong investigative, RCA, stakeholder-management and remediation-governance skills.

📌 Senior Cybersecurity Specialist – Threat Detection & Vulnerability Management (Toronto)
🏢 HCLTech
📍 Toronto