Cryptojacking: protect your business from malicious mining
When an attacker quietly hijacks the computing power of your workstations and servers to mine cryptocurrency, your bill, performance, and security pay the price. Understanding the phenomenon, spotting the warning signs, and adopting the right reflexes: that is how you stay in control.
What is cryptojacking?
Cryptojacking refers to the unauthorized use of a victim's computing resources: processor (CPU), graphics card (GPU), memory, and therefore electricity, to mine cryptocurrency for the benefit of an attacker. Mining consists of solving intensive cryptographic calculations rewarded in digital currency. Rather than funding their own machines and electricity, the criminal simply parasites those of others.
It is a threat silent by design: unlike a ransomware which announces itself loudly, cryptojacking seeks to remain invisible for as long as possible. The more discreet it stays, the more it earns. As a result, many organizations mine on behalf of attackers for weeks without knowing it, discovering the problem only through an abnormal cloud bill or an IT fleet that has become strangely slow.
The appeal is purely economic. Mining is free for the attacker and difficult to trace. Where data exfiltration exposes the criminal, cryptojacking simply turns your infrastructure into a passive revenue source, an often underestimated risk that nevertheless reveals the same weaknesses that a more serious attack would have exploited.
How attackers invite themselves into your systems
Three major families of vectors coexist. Browser-based cryptojacking (or « drive-by mining ») injects a mining script into a web page or advertisement: as long as the tab remains open, your CPU works for the attacker, with no installation required. The cryptojacking through malware installs a persistent miner on the workstation or server, via a booby-trapped attachment, cracked software, or exploitation of an unpatched vulnerability. It survives restarts and relaunches discreetly. Finally, cloud and server cryptojacking targets your most powerful environments: exposed credentials, containers misconfigured, open APIs, or public servers make it possible to deploy mining at scale, where computing power (and the bill) are highest. In all cases, the entry point is almost always the same: a weak password, a missing patch, or an employee deceived by a malicious message. This is exactly the domain of cyber hygiene and awareness.
Warning signs & impacts for the business
Saturated CPU & GPU
Workstations that are constantly slow, fans racing, machines running hot even when idle: high and unexplained processor load is the clearest signal.
Skyrocketing cloud bill
Consumption of instances, compute, or electricity that rises without any new business activity should immediately raise an alert. Cloud mining can become very expensive, very quickly.
Degraded performance
Sluggish applications, servers that handle less load, laptop batteries draining fast: mining steals resources from your users and your production environment.
A symptom, not the disease
If a miner was able to install itself, it means a door was open. The same vulnerability could be used tomorrow for a ransomware or for exfiltration. Cryptojacking is a warning signal.
Who is affected?
All organizations, without exception. A very small business with a few workstations, an SME with an office IT fleet, a mid-sized company with cloud infrastructure: each has computing power that an attacker can monetize. Cloud and containerized environments are prime targets because they offer elastic computing power and usage-based billing, ideal ground for mining. But an employee's workstation, infected via a malicious e-mail, is also enough to get started. That is why the fight against cryptojacking is not just about a tool: it relies on employees who are aware, able to recognize a phishing e-mail and adopt the right reflexes day to day.
6 steps to protect yourself and detect it
Master update management
Most miners exploit known vulnerabilities. A rigorous patch management rigorous across operating systems, browsers, servers, and containers closes the main entry point.
Harden access
Strong passwords, multi-factor authentication, removal of default credentials, and closure of exposed APIs: misconfigured cloud environments are prime targets for mining.
Protect the browser
Script blockers, anti-mining extensions, and web filtering neutralize drive-by mining that runs simply by visiting a page or loading a malicious ad.
Monitor resources
Monitor CPU/GPU load, spikes in cloud consumption, and traffic to known mining pools. Well-tuned alerts turn a hidden cost into an incident detected early.
Detect & test
A security audit and a penetration test reveal the flaws that a miner would exploit before an attacker does.
Build lasting awareness
Your teams are the first line of defense. A phishing campaign and regular sessions reinforce the right reflexes when facing traps.
Why get support from BCIT?
Field insight
We concretely assess your exposure (workstations, servers, cloud) through a cybersecurity assessment pragmatic approach, with no jargon or unnecessary theory.
The human factor first
Mining often starts with a click. We train your teams so they become an active defense rather than an entry point.
Long-term governance
With an external CISO, you maintain continuous oversight of your resources and risks, far beyond a single incident.
Not ready to talk yet? Discover our cybersecurity assessment →
Are your machines really working for you?
Let’s take 15 minutes to review your exposure to cryptojacking and related threats. We’ll understand your context and propose a realistic, tailored action plan.
Cryptojacking: protect your business from malicious mining
When an attacker quietly hijacks the computing power of your workstations and servers to mine cryptocurrency, your bill, performance, and security pay the price. Understanding the phenomenon, spotting the warning signs, and adopting the right reflexes: that is how you stay in control.
What is cryptojacking?
Cryptojacking refers to the unauthorized use of a victim's computing resources: processor (CPU), graphics card (GPU), memory, and therefore electricity, to mine cryptocurrency for the benefit of an attacker. Mining consists of solving intensive cryptographic calculations rewarded in digital currency. Rather than funding their own machines and electricity, the criminal simply parasites those of others.
It is a threat silent by design: unlike a ransomware which announces itself loudly, cryptojacking seeks to remain invisible for as long as possible. The more discreet it stays, the more it earns. As a result, many organizations mine on behalf of attackers for weeks without knowing it, discovering the problem only through an abnormal cloud bill or an IT fleet that has become strangely slow.
The appeal is purely economic. Mining is free for the attacker and difficult to trace. Where data exfiltration exposes the criminal, cryptojacking simply turns your infrastructure into a passive revenue source, an often underestimated risk that nevertheless reveals the same weaknesses that a more serious attack would have exploited.
How attackers invite themselves into your systems
Three major families of vectors coexist. Browser-based cryptojacking (or « drive-by mining ») injects a mining script into a web page or advertisement: as long as the tab remains open, your CPU works for the attacker, with no installation required. The cryptojacking through malware installs a persistent miner on the workstation or server, via a booby-trapped attachment, cracked software, or exploitation of an unpatched vulnerability. It survives restarts and relaunches discreetly. Finally, cloud and server cryptojacking targets your most powerful environments: exposed credentials, containers misconfigured, open APIs, or public servers make it possible to deploy mining at scale, where computing power (and the bill) are highest. In all cases, the entry point is almost always the same: a weak password, a missing patch, or an employee deceived by a malicious message. This is exactly the domain of cyber hygiene and awareness.
Warning signs & business impacts
CPU & GPU saturated
Workstations that are constantly slow, fans racing, machines running hot even when idle: high and unexplained processor load is the clearest signal.
Skyrocketing cloud bill
Consumption of instances, compute, or electricity that rises without any new business activity should immediately raise an alert. Cloud mining can become very expensive, very quickly.
Degraded performance
Sluggish applications, servers that handle less load, laptop batteries draining fast: mining steals resources from your users and your production environment.
A symptom, not the disease
If a miner was able to install itself, it means a door was open. The same vulnerability could be used tomorrow for a ransomware or for exfiltration. Cryptojacking is a warning signal.
Who is affected?
All organizations, without exception. A very small business with a few workstations, an SME with an office IT fleet, a mid-sized company with cloud infrastructure: each has computing power that an attacker can monetize. Cloud and containerized environments are prime targets because they offer elastic computing power and usage-based billing, ideal ground for mining. But an employee's workstation, infected via a malicious e-mail, is also enough to get started. That is why the fight against cryptojacking is not just about a tool: it relies on employees who are aware, able to recognize a phishing e-mail and adopt the right reflexes day to day.
6 steps to protect yourself and detect it
Master update management
Most miners exploit known vulnerabilities. A rigorous patch management rigorous across operating systems, browsers, servers, and containers closes the main entry point.
Harden access
Strong passwords, multi-factor authentication, removal of default credentials, and closure of exposed APIs: misconfigured cloud environments are prime targets for mining.
Protect the browser
Script blockers, anti-mining extensions, and web filtering neutralize drive-by mining that runs simply by visiting a page or loading a malicious ad.
Monitor resources
Monitor CPU/GPU load, spikes in cloud consumption, and traffic to known mining pools. Well-tuned alerts turn a hidden cost into an incident detected early.
Detect & test
A security audit and a penetration test reveal the flaws that a miner would exploit before an attacker does.
Build lasting awareness
Your teams are the first line of defense. A phishing campaign and regular sessions reinforce the right reflexes when facing traps.
Why get support from BCIT?
Field insight
We concretely assess your exposure (workstations, servers, cloud) through a cybersecurity assessment pragmatic approach, with no jargon or unnecessary theory.
The human factor first
Mining often starts with a click. We train your teams so they become an active defense rather than an entry point.
Long-term governance
With an external CISO, you maintain continuous oversight of your resources and risks, far beyond a single incident.
Not ready to talk yet? Discover our cybersecurity assessment →
Are your machines really working for you?
Let’s take 15 minutes to review your exposure to cryptojacking and related threats. We’ll understand your context and propose a realistic, tailored action plan.