Cyber Security Services Sydney

Cyber Security Services. Reduce Risk. Strengthen Your Security.

City Systems helps Sydney and Australian organisations reduce cyber risk, meet regulatory obligations and protect critical business data through practical, standards-aligned cyber security solutions.

Our security-first approach is proactive, risk-based and tailored to your organisation — combining security technology, monitoring, governance and practical advice to strengthen your security posture over time.

Whether you need ongoing protection, compliance support, Microsoft 365 security or strategic cyber security guidance, we work as an extension of your team.

Book a Cyber Security Review → Explore Cyber Security How We Secure Your IT ↓

Assess Understand security gaps and business risk

Protect Implement practical security controls

Monitor Maintain ongoing visibility and detection

Improve Strengthen security maturity over time

Practical Cyber Security

Security Isn't One Size Fits All.

Every organisation has a different technology
environment, risk profile and set of compliance obligations.

We take the time to understand how your organisation operates
before recommending controls, technology or security frameworks.

Our goal is to reduce real-world risk while making security practical to manage, clearly documented and appropriate to the needs of your organisation.

Cyber Security Services

Protection Across Your Technology Environment.

Our cyber security services combine technology, monitoring, governance and practical risk management to help protect your people, systems and data.

Security Assessments

Identify vulnerabilities, security gaps and opportunities to improve your overall cyber security posture.

Microsoft 365 Security & Data Protection

Strengthen identities, email, collaboration and data protection across Microsoft 365, including DLP and information protection.

Endpoint & Device Security

Protect laptops, desktops and supported devices through secure configuration, monitoring and endpoint controls.

Identity & Access

Strengthen authentication, privileged access, account security and identity protection.

Security Monitoring

Continuous security monitoring helps identify suspicious activity and emerging threats earlier.

Incident Response

Prepare for security incidents with documented response processes, escalation and recovery support.

Governance & Compliance

Support security policies, risk management, audit preparation and regulatory requirements.

Security Awareness

Help staff recognise cyber risks and build safer security behaviours through practical awareness and guidance.

ISO 27001 Certified

Security Isn't Just What We Recommend. It's How We Operate.

City Systems is ISO 27001 certified, reflecting a structured, risk-based approach to information security management, governance and continual improvement.

We apply those same principles across the technology services we deliver, helping keep security, risk management and operational resilience part of everyday IT management.

01 Risk-Based

Security priorities informed by risk rather than technology for technology's sake.

02 Documented

Clear security processes, responsibilities and governance.

03 Auditable

Security controls structured to support accountability and compliance requirements.

04 Continually Improved

Security reviewed and strengthened as threats, systems and requirements evolve.

Modern Cyber Risk

Protect Against the Risks Businesses Face Every Day.

Cyber incidents don't only affect large enterprises. Organisations of every size can be exposed through email, identity, devices, applications and people.

Effective cyber security combines preventative controls with monitoring, user awareness and a clear plan for responding when something goes wrong.

Phishing & Email Threats

Reduce the risk of malicious email, credential theft and social engineering.

Ransomware

Strengthen preventative controls, monitoring and recovery capability.

Business Email Compromise

Improve identity and email security to reduce impersonation and financial fraud.

Credential Theft

Protect accounts through stronger identity, authentication and access controls.

Data Loss & Breaches

Protect sensitive information through layered security and data protection.

Advanced Cyber Security

Continuous Monitoring. Detection. Response.

Modern cyber threats can bypass traditional preventative controls. City Systems provides advanced monitoring, detection and response capabilities designed to identify suspicious activity earlier and support rapid action when a potential threat is detected.

Our managed security approach extends protection across endpoints, Microsoft 365, identities and user activity, combining security technology with ongoing monitoring and specialist investigation.

0124/7 Managed Threat Detection & Response

Continuous monitoring, investigation and response to suspicious or malicious activity.

02Endpoint Threat Detection & Response

Advanced endpoint monitoring to identify malicious behaviour and indicators of compromise.

03Microsoft 365 Threat Monitoring

Monitoring for suspicious sign-ins, account compromise and malicious cloud activity.

04Identity Threat Detection

Visibility into suspicious authentication, compromised credentials and unauthorised access.

05Managed Security Operations

Security alerts reviewed and investigated by security specialists with escalation where required.

06Ransomware & Malware Protection

Detection and response capabilities designed to identify ransomware, malware and advanced threats.

07Persistent Threat Detection

Identification of techniques attackers may use to maintain unauthorised access to systems.

08Security Incident Investigation

Analysis of detected events to determine their nature, severity and potential business impact.

09Threat Containment & Remediation

Support to contain identified threats and implement appropriate remediation actions.

10Security Awareness & Phishing Protection

Ongoing capabilities that help staff recognise phishing, social engineering and common cyber threats.

11Security Reporting & Visibility

Clear visibility of detected threats, security incidents and remediation activity.

Microsoft 365 Data Protection

Protect Sensitive Information. Reduce the Risk of Data Loss.

Data Loss Prevention (DLP) helps organisations identify, monitor and protect sensitive information as it is used, shared and stored across Microsoft 365.

City Systems can help design, implement and manage Microsoft Purview DLP policies that reduce accidental or unauthorised sharing while allowing staff to continue working productively.

PROTECT

Sensitive Business Data

Identify and protect financial, personal, confidential and other sensitive information across your organisation.

CONTROL

External Sharing

Warn, restrict or block sensitive information from being shared with unauthorised users or external services.

MICROSOFT 365

Email, Files & Collaboration

Apply DLP controls across Exchange Online, SharePoint, OneDrive, Teams and supported endpoints.

AI & CLOUD

Reduce Data Leakage

Help reduce the risk of sensitive information being copied, uploaded or shared through unapproved applications and AI services.

GUIDANCE

User Policy Warnings

Provide users with real-time warnings and policy guidance when their actions may expose sensitive information.

VISIBILITY

Monitoring & Review

Improve visibility of potential data-loss events and continually refine policies as business requirements change.

DLP should protect information without unnecessarily restricting how your organisation works.

We help assess your Microsoft 365 environment, identify sensitive information, develop appropriate policies and progressively implement controls based on your organisation's risk profile, licensing and compliance requirements.

Australian Cyber Security Frameworks

Essential Eight. A Strong Security Baseline.

We help organisations assess, implement and improve security controls aligned with the Australian Signals Directorate's Essential Eight and broader Australian cyber security guidance.

As ASD guidance evolves, the objective remains the same: implement practical controls that meaningfully reduce cyber risk and improve resilience.

We treat frameworks as part of a broader security strategy — not as a once-off compliance checklist.

Read our Essential Eight 2026 update →

Security Maturity Assess. Prioritise. Remediate. Improve.

We help identify security gaps, prioritise remediation and progressively strengthen controls based on your organisation's risk profile.

MFA Patching Applications Privileges Backups Hardening

City Systems Security Framework

How We Secure Your IT Environment.

Layered protection across people, identity, devices, cloud, data, monitoring and recovery — designed to reduce risk and strengthen resilience across your technology environment.

PREVENT PROTECT DETECT RESPOND RECOVER IMPROVE

People &
Identity

Multi-factor authentication
Conditional Access
Security awareness
Privileged access controls
Identity monitoring

Devices &
Endpoints

Managed devices
Endpoint protection & EDR
Device encryption
Patch & vulnerability management
Secure configuration

Microsoft 365
& Cloud

Email protection
Microsoft 365 security
Secure collaboration
Cloud security configuration
Threat monitoring

Data
Protection

Data loss prevention
Information protection
Data classification
External sharing controls
Sensitive-data monitoring

Monitoring &
Response

24/7 managed threat detection
Security event analysis
Identity threat detection
Incident investigation
Containment & remediation

Backup &
Resilience

Regular automated backups
Secure off-site protection
Disaster recovery
Business continuity
Recovery testing

ISO 27001 Certified

⚙Managed IT

◇Cyber Security

☁Microsoft Cloud

Our Security Approach

Assess. Protect. Monitor. Respond. Improve.

Cyber security is an ongoing process of understanding risk, applying practical controls and continually strengthening the environment.

Assess

Understand your technology, security posture, business risk and compliance requirements.

Protect

Implement controls that reduce exposure across identities, devices, applications and data.

Monitor

Maintain visibility across your environment and identify suspicious activity earlier.

Respond

Establish practical processes for containment, escalation, recovery and communication.

Improve

Review risk, controls and security maturity continuously as threats and requirements change.

Flexible Cyber Security Support

Ongoing Protection or Additional Security Expertise.

Your organisation may need a complete managed security capability or additional expertise alongside an internal IT team.

City Systems can provide ongoing security management, monitoring and compliance support or assist with specific assessments, uplift projects and strategic security initiatives. For organisations wanting security integrated with day-to-day support, our Managed IT Services provide a broader security-first operating model.

Our role can adapt as your organisation, risk profile and compliance obligations change. This can be particularly useful for SMEs & Mid-Market organisations that need stronger security capability as they grow.

Security Across Your Technology

Cyber Security Works Best When Everything Works Together.

Security connects with the way your IT, cloud, identities and data are managed every day.

Managed IT Services

Proactive IT management with security built into everyday technology operations.

Explore → 02

Microsoft 365 & Cloud

Secure Microsoft cloud environments supporting identity, collaboration and productivity.

Explore → 03

Backup & Recovery

Protect critical information and maintain practical recovery capability.

Explore → 04

IT Strategy & Advisory

Practical technology and risk planning aligned with organisational priorities.

Explore → 05

SMEs & Mid-Market

Security, cloud and managed IT services for growing organisations with evolving technology requirements.

Explore → 06

Professional Services

Cyber security and technology services for firms handling sensitive client and business information.

Explore →

Why City Systems

Practical Security. Experienced Guidance.

ISO 27001 Certified

Security and risk management embedded into our own operations and service delivery.

20+ Years of Experience

Supporting Australian organisations and managing evolving technology environments.

Security + Managed IT

Security integrated with the technology your organisation relies on every day.

Risk-Based Approach

Practical controls based on your environment, priorities and security requirements.

Microsoft Expertise

Security across Microsoft 365, identities, devices, cloud services and collaboration.

Ongoing Improvement

Security reviewed, monitored and strengthened as risks and requirements evolve.

Cyber Security Services Sydney FAQs

Frequently Asked Cyber Security Questions.

Common questions about cyber security, Microsoft 365 protection, Essential Eight, monitoring and ongoing security management.

What cyber security services does City Systems provide?

Services can include security assessments, Microsoft 365 security, identity and access controls, endpoint security, monitoring, incident response planning, governance, compliance support, Essential Eight uplift, DLP and security awareness.

Can you help us improve Microsoft 365 security?

Yes. We can review and improve security across identities, devices, email, collaboration and data, including Entra, Intune, Microsoft security controls and Purview capabilities where appropriate.

Can City Systems help with Essential Eight?

Yes. We can assess your current maturity, identify gaps and help implement practical controls aligned with the Essential Eight and broader Australian cyber security guidance.

Do you provide Data Loss Prevention for Microsoft 365?

Yes. We can help design, implement and manage Microsoft Purview DLP policies to protect sensitive information across Exchange Online, SharePoint, OneDrive, Teams and supported endpoints.

Can you work alongside our internal IT team?

Yes. City Systems can provide specialist security capability, monitoring, compliance support, assessments and uplift projects alongside an existing internal IT team.

Is City Systems ISO 27001 certified?

Yes. City Systems is an ISO 27001 certified organisation, with information security and risk management embedded in the way we operate and deliver technology services.

Strengthen Your Security Posture

How Secure Is Your IT Environment Today?

Whether you're reviewing existing cyber security controls, preparing for compliance requirements, improving Microsoft 365 security or looking for ongoing protection, City Systems can help you identify risk and build a practical roadmap for improvement.

Book a Cyber Security Review → Call (02) 9169 5700