Ransomware is one of the most devastating forms of cybercrime — and attacks on Australian businesses are accelerating. In 2024, ransomware cost Australian organisations hundreds of millions in downtime, recovery and ransom payments. Understanding exactly how these attacks work is the first step to stopping them.
The Ransomware Attack Lifecycle
Ransomware attacks follow a predictable sequence. Each stage is an opportunity to detect and stop the attack before damage is done.
Stage 1: Initial Access
Attackers gain entry through a phishing email, malicious download, exposed remote desktop (RDP), or compromised credentials. This is the critical moment — if you stop it here, the attack fails. The most common vector in 2024 was phishing, accounting for over 40% of Australian ransomware incidents.
Stage 2: Establishing Persistence
Once inside, the attacker installs backdoor software to maintain access even after password changes or reboots. They often stay hidden for days or weeks before triggering the ransomware — the average dwell time in Australia is 16 days.
Stage 3: Lateral Movement
The attacker explores your network, identifies valuable data and backup systems, and moves to infect as many devices as possible to maximise leverage. They specifically target and destroy backup systems to remove your recovery options.
Stage 4: Data Exfiltration
Modern ransomware groups steal your data before encrypting it — creating double leverage. Pay the ransom, or we release your confidential customer and business data publicly. This "double extortion" now accounts for over 70% of ransomware attacks.
Stage 5: Encryption
The ransomware encrypts all targeted files using military-grade cryptography. Without the attacker's decryption key, your files are permanently inaccessible. Encryption of a full network can happen in under 45 minutes.
Stage 6: Ransom Demand
A ransom note demands payment — typically in cryptocurrency — in exchange for a decryption key. There is no guarantee paying will restore your files. Australian businesses paid an average of $1.4M in ransoms in 2024.
How IntrusionX Stops Ransomware
The most effective defence is layered — catching ransomware at multiple stages of the attack chain:
- Behavioural EDR — detects ransomware-like behaviour (mass file modification) before encryption completes
- 24/7 SOC monitoring — analysts detect unusual network activity during lateral movement
- Automated device isolation — instantly quarantines infected machines to stop spread
- Ransomware rollback — restores files to their pre-attack state within minutes
- Phishing-resistant email filtering — blocks the most common initial access vector
- Multi-factor authentication — prevents compromised credentials from granting access
What to Do If You've Been Hit
If ransomware is active in your environment: disconnect affected devices from the network immediately, do not pay the ransom without consulting security experts, and call our incident response line at +61 499 468 971. Speed is critical — every minute increases the blast radius.