Blockchain mining is the process of solving complex mathematical equations to verify blockchain transactions. It functions much like bookkeeping, maintaining the blockchain in synchronization. Some cryptocurrencies \u2014 famously Bitcoin \u2014 compensate miners by “minting” new coins as a reward. <\/p>\n\n\n\n
Mining, however, is computationally intensive. Prices for a specialized rig run into the tens of thousands of dollars, and even then, the system might generate electricity bills faster than it does cryptocurrency to cover expenses. <\/p>\n\n\n\n
Hackers, who want all the profit but none of the challenge, resort to hyjacking systems of other users \u2014 specialized or not. This is where cryptomining malware comes in. Let\u2019s break it down in this article. <\/p>\n\n\n\n
To understand the full impact of cryptocurrency mining malware, it’s important to start with the cryptomining definition. Cryptocurrencies, like Bitcoin and Monero use a consensus mechanism called Proof of Work (PoW). The essence of PoW is to solve a cryptographic puzzle to verify legitimacy of transactions. This puzzle is essentially finding a value that, when hashed with the SHA-256 algorithm (in Bitcoin’s case), results in a number that is less than or equal to a target value set by the network. <\/p>\n\n\n\n
The process involves miners taking information from transactions waiting to be confirmed (from the mempool), a reference to the previous block’s hash, and a nonce. The nonce is a number that miners iterate over. They hash the block’s information along with the nonce, and if the result doesn’t meet the target, they change the nonce and try again. <\/p>\n\n\n\n
Upon solving the puzzle, the miner broadcasts the new block to other network participants (nodes). These nodes verify the block’s validity, including the correctness of the solution and the legitimacy of the transactions contained within. Once verified, the block is added to the blockchain, and the successful miner receives a block reward \u2014 a new cryptocurrency unit. <\/p>\n\n\n\n
Going back to the crypto malware definition, we can answer the question of “what is cryptomalware” by stating that crypto miner malware is malicious software that secretly installs itself on a victim’s device and uses its processing power to perform calculations. Cryptominer malware hijacks other users’ systems to run the mining process described above. If successful, the hacker receives the reward, while the system’s owner gets nothing. This type of malware operates covertly, with the goal of staying undetected for as long as possible to maximize mining time. <\/p>\n\n\n\n
Miners are unique because they typically don’t damage files or steal data but instead drain system resources. As a result, victims of Bitcoin malware may notice: <\/p>\n\n\n\n
There are many types of malicious software targeting cryptocurrency, including Bitcoin miner malware.<\/p>\n\n\n\n
Originally, XMRig is open-source CPU mining software. Unlike Bitcoin mining malware, XMRig is designed for mining Monero (XMR). Cybercriminals have repurposed it, embedding the software within malware. The malicious version of XMRig performs cryptojacking by intelligently adjusting the mining intensity based on the system’s CPU usage to minimize detection risk, making it difficult to identify through usual system symptoms.\u00a0<\/p>\n\n\n\n