As Christmas greetings, invoices, and gift lists flood inboxes, malicious actors exploit the festive cheer with macro-laden attachments disguised as legitimate documents. These ‘naughty scripts’ are a classic delivery vector for malware, ransomware and credential theft. Attackers take advantage of human curiosity and urgency as employees are more likely to open a ‘delivery receipt’ or ‘holiday bonus spreadsheet’ during the festive season. Executives must be alert to this persistent threat, as malicious macros can quickly escalate into major data breaches or operational outages.
Malicious macros are small pieces of executable code embedded within Microsoft Office documents, typically Word or Excel files. When a user opens the document and enables macros, the code executes automatically, downloading and installing malware, creating persistence or establishing remote access.
Attackers distribute these documents through phishing campaigns or file-sharing links that appear to come from legitimate sources. Common lures include ‘delivery notifications,’ ‘Christmas party rosters,’ or ‘updated vendor payment forms.’ Once executed, the macro may download a remote access trojan (RAT), modify registry settings or disable antivirus software to maintain control.
Macros are particularly dangerous because they abuse a trusted feature within Office, making them difficult for traditional filters to block without impacting productivity. Attackers often digitally sign their documents or disguise file types to bypass security controls.
The Australian Cyber Security Centre (ACSC) has repeatedly warned about macro-based malware campaigns, especially during seasonal peaks. In December 2021, several Australian small businesses reported receiving ‘invoice update’ emails containing Excel files with malicious macros that installed the Emotet trojan, a notorious malware used to deliver ransomware. Once executed, the malware spread laterally through shared drives and email contacts, leading to multiple infections across connected organisations.
In the Annual Cyber Threat Report 2024-2025, Australian businesses saw the average cost of cybercrime increase by 50% overall to over $80,000. The cost to individuals grew less but still averaged $33,000 in the past year.
Several Essential Eight strategies directly address macro-based threats and significantly reduce exposure:
These measures collectively break the attack chain, stopping malicious macros from executing, spreading or achieving persistence.
By aligning with the Essential Eight and reinforcing staff awareness, organisations can ensure their systems stay secure, keeping the only Christmas surprises to those under the tree, not in the inbox.
Each agent compares the current patch list against what is actually installed on its device. Any gap between what has been released and what is deployed is immediately surfaced. Critically, Introspectus pays particular attention to the timing of patch deployment not just whether a patch is present, but when it was applied.
This temporal dimension is central to Essential Eight compliance, where the difference between a patch applied on day two versus day thirty can mean the difference between maturity levels, and between an environment that was protected and one that was exposed.
This combination of daily patch intelligence, severity-based filtering, agent-level validation, and deployment timing analysis gives organisations a real-time, evidence-based view of their operating system patch posture mapped directly to the ISM controls applicable to the Essential Eight patch operating systems strategy.
The visibility gap here is particularly consequential. A patch may be approved and scheduled, yet never successfully applied due to a failed deployment, a device that was offline during the maintenance window, a reboot that was deferred, or a system that exists outside managed channels entirely.
Organisations that rely solely on deployment tooling to confirm patch status are measuring intent, not reality. The ACSC is explicit on this point: organisations need to confirm patches have been applied successfully, not merely that they were dispatched.
Within the Essential Eight framework, patching operating systems is a core and non-negotiable control. The ACSC sets clear expectations: patches for internet-facing infrastructure must be applied within 48 hours when identified as critical or where working exploits exist, and within two weeks for standard releases.
Patches for workstations, servers, and network devices must be applied within one month, with tighter timeframes applying in high-threat environments. Critically, the ACSC also mandates that vulnerability scanning occurs at least daily for internet-facing systems and at least fortnightly for workstations and non-internet-facing infrastructure not to replace patching, but to confirm it has actually occurred.
From this inventory, Introspectus performs targeted web intelligence gathering. For each application identified, the platform locates the top five authoritative sources of patch and release information vendor security advisories, release notes, and vulnerability databases and retrieves that content into a central repository.
Aletheia, Introspectus’s AI analysis agent, then reads and analyses this content to extract the intelligence that matters for application patching: the latest available version, whether a release addresses a security vulnerability, the severity of that vulnerability, and all information relevant to the Essential Eight application patching requirements. This structured intelligence is mapped directly to the applicable ISM controls, producing defensible, audit-ready evidence of an organisation’s application patch compliance posture.
A critical and frequently overlooked problem is the visibility gap. Organisations may believe their applications are current when, in reality, patches have silently failed, devices have missed deployment windows, or software has been installed outside of managed channels entirely.
Without continuous inspection at the endpoint level, these gaps go undetected until an audit or, worse, a breach.
Within the Essential Eight standard, patching applications is a dedicated and non-negotiable control. The ACSC specifies clear timeframes: critical vulnerabilities in internet-facing services must be addressed within 48 hours, commonly used applications such as office productivity suites, web browsers, email clients and PDF software must be patched within two weeks of release, and all other applications within one month.
For organisations in high-threat environments, the bar is higher still. Meeting these requirements consistently across hundreds of distinct applications deployed across thousands of endpoints is not achievable through manual effort alone.