Inside a Hacker's Playbook: What Organisations Can Learn from a Real Attack
What can cybercriminals teach us about cybersecurity? Insights from a recent ransomware negotiation reveal how a single vulnerability can escalate into a major security breach, and what organizations can learn from it.
A Rare Look Inside a Real Cyberattack
At Secutec, we don't just analyze cyberattacks from a distance. We gain insights directly from the people behind them.
As an internationally recognized cybercrime negotiator, Geert Baudewijns, founder and CEO of Secutec, regularly communicates with cybercriminal groups on behalf of organizations affected by ransomware attacks.
These negotiations offer a rare perspective on how attackers operate, which vulnerabilities they exploit and how they navigate corporate networks. Understanding the root cause of an attack is often an important part of the negotiation process.
During a recent case, a Ransomware group shared a remarkably detailed account of how it had allegedly compromised an organization's network, obtained privileged credentials, accessed critical infrastructure and exfiltrated sensitive data.
This case illustrates how a single vulnerability, combined with inadequate security controls, can potentially lead to a complete network compromise.
The following story is based on information provided by the attackers during negotiations. Their claims have not been fully independently verified, and identifying details have been removed.
The Attack, told by the Attackers
The attackers' explanation reveals several critical lessons about how modern cyberattacks unfold.
1. The Initial Entry Point: Exploiting an Exposed Vulnerability
The attack reportedly began not with a phishing email, but with the exploitation of a vulnerability in internet-facing infrastructure.
VPN gateways, firewalls and exposed servers are attractive targets because they provide potential entry points into corporate environments. Attackers actively scan for vulnerable systems, particularly those that remain unpatched.
The lesson: Organizations need continuous visibility into their external attack surface. Identifying exposed assets, detecting vulnerabilities and prioritizing remediation are essential to reducing opportunities for attackers.
2. The Domino Effect of Compromised Credentials
Once inside the network, the attackers reportedly discovered domain administrator credentials on a server.
Those credentials allegedly provided access across the Windows domain. By testing password variations, the attackers were subsequently able to compromise additional critical infrastructure.
What started as access to a single system escalated into control over large parts of the organization's IT environment.
The lesson: Privileged accounts require particularly strong protection. Multifactor authentication (MFA), Privileged Access Management (PAM), dedicated administrator accounts and network segmentation can significantly limit an attacker's ability to move laterally.
A single compromised credential should never become the key to an entire network.
3. Data Theft Happens Before the Ransom Demand
One of the most revealing details was the timing of the data theft.
While the attackers were still planning their next steps, they were already exfiltrating sensitive information.
This illustrates an important reality of modern ransomware operations: the damage can begin long before encryption or a ransom demand makes the attack visible.
Attackers may spend considerable time exploring systems, escalating privileges and collecting valuable data while remaining undetected.
The lesson: Prevention alone is insufficient. Continuous monitoring, endpoint detection and response (EDR/XDR), and behavioral threat detection are essential to identify suspicious activity early, particularly lateral movement, unusual access patterns and abnormal data transfers.
4. When Cybercriminals Offer Security Advice
Perhaps the most ironic part of the exchange came at the end.
The attackers themselves provided a list of cybersecurity recommendations, including modern endpoint protection, systematic MFA, regular patching, protected backups and dedicated cybersecurity expertise.
Advice from cybercriminals must always be treated critically. Nevertheless, their recommendations reinforce an uncomfortable truth: many serious breaches exploit weaknesses in fundamental security controls.
The lesson: Effective cybersecurity does not necessarily mean adding more technologies. It means ensuring that essential security measures are implemented correctly, work together and are continuously monitored.
What Can Organizations Learn?
This case demonstrates how several security weaknesses can combine to turn a single intrusion into a major incident. Protecting an organization requires more than addressing individual vulnerabilities. It demands a coordinated approach across five essential areas.
-
Attack Surface Management:
Continuously identify internet-facing assets, detect exposed vulnerabilities and prioritize remediation before attackers exploit them.
-
Identity Security:
Protect privileged accounts through PAM, MFA, strong access controls and appropriate network segmentation.
-
Continuous Threat Detection:
Monitor suspicious behavior across endpoints, identities and infrastructure to identify threats before they escalate.
-
24/7 Security Operations:
Ensure continuous detection, investigation and response, even outside regular business hours.
-
Incident Readiness:
Maintain protected, regularly tested backups and established incident response procedures to minimize disruption and accelerate recovery.
The key takeaway? Cyber resilience depends not only on preventing attackers from entering a network, but also on detecting their presence, limiting their movements and responding before significant damage occurs.
Turning First-Hand Intelligence into Stronger Cyberdefence
For Secutec, this exchange represents more than an interesting case study.
Our direct contact with cybercriminals, combined with continuous threat intelligence research and monitoring of criminal ecosystems, helps us identify emerging attack techniques, understand recurring weaknesses and adapt our security services to the threats organizations actually face.
Through the SecureSIGHT Exposure Management Platform, Secutec helps organizations identify vulnerabilities and security exposures before attackers exploit them.
Our managed detection and response capabilities, supported by our 24/7 Security Operations Center, provide continuous visibility, threat detection and response. When incidents do occur, our incident response expertise helps organizations contain the threat and recover.
The objective is not to add more disconnected security tools, but to connect exposure management, prevention, detection and response into one coordinated approach.
The Real Question: How Far Can Attackers Go?
This case highlights an uncomfortable reality: a single vulnerability can be enough to open the door, but it is the weaknesses in security controls that determine how far attackers can go, how long they remain undetected and whether they can be stopped before causing significant damage.
At Secutec, we turn first-hand insights from the cybercriminal world into actionable intelligence to help organizations stay one step ahead.