An employee has been mining cryptocurrency for 5+ years. They installed mining software on most of our company PC's (approximately 40), and purchased items stating they were required by the company but in fact were for the mining rig. They used a work email to set up a cryptocurrency account.

How should we deal with this situation? Should this be a police matter?

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    – Kilisi
    Sep 18, 2023 at 19:21
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    Could you please post an answer or update your question if this is resolved? I'm curious what will happen next.
    – Martijn
    Sep 19, 2023 at 12:26
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    This question needs more information on the location in the world that this all happened as local laws will have a major impact on how this is handled.
    – Joe W
    Sep 19, 2023 at 13:06
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    Info requested: does the employee know they've been found out? Sep 20, 2023 at 2:40

9 Answers 9


Don't touch anything.

Document what you know, what you've done so far, and then talk to HR, your legal department or lawyers. They will probably advise you to suspend this employee (and their access) while they investigate.

Depending on the exact details and laws in your area, this almost certainly constitutes computer misuse and fraud, and possibly even theft depending on where those purchased items ended up.

This is a matter for lawyers and the police, not for you.

And once things have been sorted, have a serious look at your internal security and how the company is managed. Because if someone can install dodgy software on all your systems (that connects out to the Internet on unusual ports), use a huge amount of extra power, and fraudulently purchase a load of stuff with no one noticing for five years, that's pretty damning. And also raises the question of what else they might have done in that period that you don't know about..


I'd like to build on the previous answers submitted here.

You need to work IN CONCERT with your network administrators, HR, and law enforcement. The employee needs to be arrested, and SIMULTANEOUSLY, internet access for the mining rigs must be suspended. You don't know if the employee has accomplices, and you don't know if the rigs are remotely accessible from outside your company.

  • If you suspend the employee before the arrest, there's a chance for the employee to remotely access the rigs and wipe incriminating data.
  • If you arrest the employee but don't cut off internet access, then potentially, accomplices could also wipe the rig.

You want to SUSPEND the employee email account such that incoming email still comes in, but no one can log in to it. This might be accomplished by just a password change. But don't do this until you contact law enforcement. Be advised that if you're in the US, this might be a federal crime so you'd end up dealing with the FBI if it is.

And yes, have those attorneys ready. I wouldn't worry about recovering any financial gains, at least not immediately.

Until you make a concerted move, DO NOT suspend the employee or make the employee aware that you know what you know. Play dumb.

  • 46
    The only way the employee can be arrested is if he committed a criminal act. What they have committed is a form of embezzlement. Whether this is treated as a criminal act will depend on the jurisdiction, and the amount of money embezzled. Thus you can't instantly say "Arrest him!!!". You will need to collate all the evidence first to support a criminal charge (if it is one), and that is likely to be obvious to this employee. They need to be canned first, and then work out the details.
    – Peter M
    Sep 17, 2023 at 19:21
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    Seriously, arrest them for what? You're acting like this is murder case, and not on the level of an employee stealing toilet paper rolls and taking them home. At best, they will be able to sue to guy for a few thousand dollars of damages, but will probably never see a dime even if they win.
    – Davor
    Sep 18, 2023 at 10:15
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    Fraud and embezzlement are both crimes. Sep 18, 2023 at 10:35
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    @Davor Except that we're talking about hundreds or potentially thousands of €/$/£ worth of toilet rolls. That's more than enough to be considered a crime (at least in those EU countries I know well enough).
    – TooTea
    Sep 18, 2023 at 12:00
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    @Davor A few thousand dollars is grand theft in the United States. That's a felony and could result in a prison sentence. Also, some armchair calculations I've made suggest the total theft could be more like $500,000 over five years, not counting the improperly procured equipment and lost productivity. In some jurisdictions that could be a 1st degree felony with a maximum sentence of 30 years in prison. Sep 19, 2023 at 4:21

Congratulations, you've been robbed! Or more accurately, a victim of embezzlement.

This is a criminal matter. You may want to decide if you want a public record of having had this issue, which will happen if you report the crime and come after the perpetrator for the illicit gains. If you're a physical store, it will show you take security seriously. If you're a security consulting company, you might as well liquidate.

The best course of action to recover the stolen funds will have to be determined with a lawyer's assistance, one familiar with you local law and this kind of cases.

Crypto mining uses a lot of energy, it comprises over 50% of the coin's price. It's a way to turn energy into money. The coins mined with company equipment and power should legally be the property of the company. However, recovering crypto is difficult - it's been designed to prevent just that. A threat of criminal action is about the only way you can give the offender any incentive to give up the goods.

Once you start the criminal action, your leverage is reduced. Talk it out with a lawyer. They'll know what to do, considering your exact situation. There could be a significant amount to recover, if you can prove enough.

It might make sense to contact a private security company with pentest skills or a PI agency working in cyber. They will not necessarily be able to help, but it's possible that they could trace or get hold of some of the money that hasn't been deliberately hidden. As the owner of the hardware, you're allowed to "hack" it. If not, at least you'll get a second opinion.

  • You wouldn't go after him for the value of the crypto, but rather, the electricity. That will be more money anyway. Mining at typical commercial daytime electric rates is not profitable, you need to get a favorable rate plan. Sep 20, 2023 at 0:23
  • @Harper-ReinstateMonica Recovering costs through a civil suit could take years, especially if there's also a criminal prosecution. It's also a challenge to collect. Depending on how much crypto has been mined (could be a lot), and if some's left unspent, making a return and repayment deal could be more effective. Though you'd still want to warn others about this person and not work with them again.
    – Therac
    Sep 20, 2023 at 1:32
  • that's the best part. For them, their balls are in a vice for years, making them spend thousands on attorneys, and the nightmare never ends. Whereas for you it's just one little file folder in your counsel's file cabinet. As for collections, a technical professional will have an attachable wage. Sep 20, 2023 at 1:39
  • @Harper-ReinstateMonica Not after a criminal conviction. They just have to earn enough to get out of the country, and remember the passphrase.
    – Therac
    Sep 20, 2023 at 2:27

TL;DR Taking the crypto was probably theft and breach of contract.

I would like to add something that the other answers haven't addressed. Check his employment contract - if he signed up for the account using a work email and was doing the mining using company computers, the crypto is company property under the terms of any sane employment agreement.

If the employee took the crypto for their own personal use, that constitutes theft (because the crypto was never theirs in the first place, which they presumably knew - or, at least, should have known - based on their employment contract). Also, failure to return the crypto to the company constitutes breach of contract.

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    I think breach of contract is a very minor issue compared to everything else and it would be considered theft/embezzlement both of which are actual crimes unlike breach of contract.
    – Joe W
    Sep 18, 2023 at 17:29
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    @JoeW It's still a legitimate avenue for the company to recover their damages. Also, I'm not a lawyer, but given that the crypo almost certainly belonged to the company from the outset, the employee taking it would be another form of theft. Sep 18, 2023 at 17:32
  • If the crypto currency does belong to the company, especially if it is a large amount) criminal theft/embezzlement charges are much more likely to get results then a civil breach of contract will. Such a minor issue will not be used when we are talking about large amounts of money in the criminal realm. Breach of contract will get nothing if the employee has already moved the money to other places to hide it or make in inaccessible.
    – Joe W
    Sep 18, 2023 at 17:49
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    In the US, the any crypto mined with company equipment very likely belongs to the company regardless of the presence of any contract. Sep 19, 2023 at 4:27
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    @stackoverblown The court could still order the employee to pay the monetary equivalent in damages. Sep 19, 2023 at 17:21

I'm not really sure why you think there's anything to ask here - you fire them ASAP (assuming you have authority to do this and your evidence is undeniable).

You then discuss with your company's legal advisors (either in house if you have them, or talk to some external ones if you don't) as to what you can do in terms of legal action, both with regards to recovering any damages and whether a criminal offence has been committed.

You probably then also need to look at your internal controls, because the fact that an employee could do this for 5 years without anyone noticing implies a fairly big hole.

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    Firing them will remove evidence. They'll move funds from their bitcoin wallets.
    – Nelson
    Sep 18, 2023 at 0:43
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    @Nelson Doesn't the entire transaction history remain visible? Sep 18, 2023 at 7:47
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    @HolyBlackCat, yes Bitcoin and other crypto are long stored journals. All of the history is recorded. But most criminals and crypto bros don’t understand that. Sep 18, 2023 at 10:37
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    @HolyBlackCat It remains visible but it is not necessarily obvious who owns or controls the wallets. Even if you do know it might be a person in a hard to access jurisdiction whereas your own employee is a lot more reachable.
    – quarague
    Sep 18, 2023 at 11:41
  • Exactly. Fire them, run an ad in the paper for their replacement, and entirely qualified people will be lined up around the block to fill their seat. Worked for Henry Ford! Sep 20, 2023 at 20:54

This is the time that you gather all parts of the management team together. There are legal issues, security issues, infrastructure issues, accounting issues. There may be multiple people involved, including those who approved the purchases. You may need to seek outside help.

Technically it all belongs to the company. It was either purchased with company funds, produced with company funds, or added to company equipment.

Destroying everything before the investigation can be completed might allow some of the guilty party to escape. There may even be criminal charges so the police might need to be involved.


These answers are WAY over the top.

Should the person in question be fired? Yes. Should the IT department do a full investigation and follow-up with a deep audit of what's installed on company computing infrastructure? Yes. Should a plan be developed by the IT department to prevent stuff like this from happening again? Yes. Should procurement practices be examined and audited carefully from now on? Yes.

Is this an "arrest-worthy" crime? Maybe in a mall-cop-turned-IT-pro's dream, but in real-life, NO!

This kind of thing happens a lot. It's an abuse of trust, certainly very sketchy, but it's more of an embarassment than a crime.

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    You're saying that the theft of $35,000+ in electricity is an embarrassment rather than a crime?
    – Mark
    Sep 18, 2023 at 23:33
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    @Mark Context matters. Is this a cash-strapped startup or a Google/Facebook/Twitter? Sounds somewhere in-between, but if the employee was able to fly under the radar for 5 years while buying and misusing 40 computers and misc. crypto accessories it's probably fairly large and well-established. And the employee is/was probably paid a reasonable salary for someone with authority to purchase and administer IT equipment for an entire company. Technically a crime, but also probably true both that the company will barely miss $35k and the employee can easily repay it.
    – aroth
    Sep 19, 2023 at 1:49
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    @teego1967, 200 watts of excess draw for each of 40 computers running 24/7 for five years, at a rate of $0.10 per kilowatt-hour. Works out to about 350 megawatt-hours, costing $35,000. If the company isn't in a part of the world with cheap electricity, the loss could be considerably more ($200,000+ in some place like Hawaii).
    – Mark
    Sep 19, 2023 at 2:42
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    A single crypto miner running for one day costs approximately $3 in electricity. That's almost $5500 after five years. Scale that up to 40 miners and you're talking serious money, even if you cut the power costs of each miner by a lot. And that's only the power draw. It could be argued that the mined crypto belongs to the company and therefore it having been diverted to the employee's personal account is theft of that amount. That could be another $10,000/miner/year. Now tack on improperly procured equipment and lost productivity. Could be a 1st degree felony. Sep 19, 2023 at 4:26
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    Even if all he did was procure $1000 GPUs for 40 computers and did no mining and used no electricity, that's still $40,000. Sep 19, 2023 at 4:30

This question has really brought out the armchair lawyers!

In my view, the most straightforward way of dealing with this is as gross misconduct.

I don't necessarily agree with all the fuss about internal security in the other answers.

The most senior IT staff in a business are always in a position to configure the computers like so, and there is no oversight because they are the overseers.

There's absolutely nothing extraordinary about it, especially if a single person handles the entire IT function (quite plausible in a business with 40 PCs).

Just because a particular wily scheme has been discovered does not establish that there is wider irresponsibility or maliciousness against the employer.

The most likely justification they will have in their own minds is that they are using "spare" or idle processing capacity in the company equipment for mining. The question isn't clear about how much spend there was on additional equipment, or how the OP is clear that the equipment in question had no business purpose whatsoever.

I think the answers saying "don't touch anything" are laughable, as if a business is going to tolerate its entire IT estate being impounded, whilst they hire and apply a battery of lawyers and forensic computer experts.

In terms of seriousness, if the staff member responsible is a teenager or in their 20s, and probably not paid very well, I'd be inclined to think this is the kind of irresponsibility and nerdish cunning plan that could be expected. Having discovered the situation, it might be best just to tell them to unwind it all and give a written warning.

If you're dealing with someone much older who has the proper status of a manager in the business with serious responsibilities, it's perhaps a sacking offence.


The (many) justice warriors on this thread will be sad to find out that often in western jurisdictions mining crypto at work is mostly legal and will "merely" constitute grounds for a dismissal.

Basically you are going to have to make the decision about whether to fire or retain the employee. This comes down to a question of cost/benefit: Is the employee otherwise productive? Will the firing hurt morale in the organisation? Will it set a positive precedent? Is this an individual who the company is looking to get rid of for other reasons?

Personally I would look at the big picture and avoid making rash accusations of criminality that could end up backfiring.

  • A case can be made that the mining is theft of services. Whether that will fly in court, deponent sayeth not. The other items listed, unauthorized purchase with company funds for personal use, may be easier to convince the court to act upon
    – keshlam
    Sep 19, 2023 at 14:07
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    This "justice warrior" would fire anybody who spent company resources on their own unapproved activities. I can collect evidence after the individual is fired. I also don't care if the employee is productive, if they have wasted potentially thousands of dollars on electricity powering these devices, I don't want them anywhere near my company. IT logs will prove any criminal activity.
    – Donald
    Sep 20, 2023 at 0:04
  • Guys, you are missing the point: mining crypto on company hardware is generally not considered a crime (see the link to an actual legal optinion in the answer). This means that the question is whether to retain or release the employee. If its somebody you want to get rid of: no problem. If its somebody who is valuable for the company- you need to make that decision on a cost/benefit basis.
    – Fergie
    Sep 20, 2023 at 6:37
  • "A 34-year-old man [..] has been sentenced for using the Commonwealth Scientific and Industrial Research Organisation’s (CSIRO) servers and supercomputers to carry out cryptocurrency mining. [..] The 34-year-old pleaded guilty on 28 February 2020 before the Downing Centre Local Court to the charge of unauthorised modification of data to cause impairment, contrary to section 477.2 of the Criminal Code Act 1995 " (source).
    – Voo
    Sep 20, 2023 at 9:02
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    @Fergie And now please tell me where the criminal code I referenced says anything about public or federal only? You won't be able to, because it doesn't and there's been lots of people over the years being convicted that had nothing to do with any federal or public organisation because of it.
    – Voo
    Sep 20, 2023 at 14:05

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