Corporate Cyber Security: Changing Threats and Defence Priorities

Cyber security was treated for a long time as a matter for the IT department. Today a data breach means halted production, lost customers, regulatory penalties and damaged reputation. It has ceased to be a technical issue and become a question of business continuity.
The shape of the threats has changed too. Rather than forcing a single vulnerability, attackers look for the weakest link — and more often than not that link is not a software flaw but a password or an email.

The majority of attacks on corporate systems today begin not with a sophisticated exploit but with a stolen or guessed password.
Distributed, low-and-slow attacks
- A classic brute-force attack made hundreds of attempts from a single address and was easy to block. Today's attacks are spread across hundreds of different IP addresses, each making only one or two attempts before withdrawing.
- This pattern is designed to slip beneath threshold-based protection. A rule of "five failed logins in ten minutes" never sees an attack that makes a single attempt per address.
Password reuse
- Using the same password across multiple accounts turns the compromise of one account into a total breach. Once a single mailbox password is obtained, every other account sharing it must be considered lost as well.
- The risk is particularly common where accounts are created internally with a standard password; a choice made for convenience becomes a door the attacker opens with a single key.

Ransomware no longer merely encrypts your data; it copies it first. Even if you restore from backup, the pressure of "pay or we publish" remains.
Taking backups is therefore not a sufficient defence on its own. Backups must be offline and immutable, recovery time must be measured, and the moment of intrusion must be detectable.

Even when your own systems are secure, the update server of a piece of software you use, or the access granted to a supplier, may be the weak link.
In most organisations the scope, duration and traceability of third-party access is unclear. If there is no written answer to "who can reach which system, and until when?", the risk is not being managed.

For years we could spot phishing emails by their broken grammar. Generative AI has removed that tell: messages can now be produced in flawless language, matched to internal tone, and even referencing previous correspondence.
Voice and video impersonation (deepfakes) pose a serious threat, particularly around payment instruction processes. Alongside technical controls, the habit of verifying critical transactions through a second channel is essential.

A password belonging to your organisation most often leaks not from your own systems but from the breach of another service your employee uses. Such data is sold in bulk on dark web marketplaces.
One arm of defence therefore points outward: regularly scanning for leaked credentials tied to your domain gives you the chance to act before an attack takes place.

Multi-factor authentication (MFA). The single highest-return measure. It blocks entry even when a password has been stolen. Prioritise administrator accounts, remote access and email.
Password policy and preventing reuse. A complexity rule alone is not enough; what matters most is that the same password is not used across multiple accounts.
Access control at network level. Management panels and infrastructure interfaces should not sit fully exposed to the internet; narrow access through IP restriction or a zero-trust approach.
Logging and monitoring. If you do not know when a breach began, you cannot establish its scope. Authentication records should be retained for at least 90 days and reviewed regularly.
Regular penetration testing. An audit carried out once a year falls short while systems change continuously. Automated, continuous scanning should run alongside point-in-time testing.

Start with an inventory: which systems are exposed to the internet, which accounts exist, and which are actually in use? Most organisations are surprised when they discover unused accounts that still hold privileges.
Then apply the highest-impact measure — which is almost always MFA. Close the most likely attack path rather than waiting to build a perfect security programme.
Finally, measure. How many accounts have MFA enabled, how many systems are monitored, when was the last penetration test? A level of security that is not measured cannot be managed.

Cyber security is not a project that is set up once and finished; it is a process that is operated continuously. As threats change, defences must change with them.
At Helix Teknoloji we make organisational risk visible and manageable through our security auditing, penetration testing, network access control and continuous monitoring services, together with RadarSonic, our data leak scanning platform.