Hidden cryptocurrency miner

It's a simple trick, but one which stops users from potentially spotting an application that shouldn't be running, wuapp. After the user closes the Task Manager, Norman resumes its work. The malware has been built to be extremely persistent and it keeps in regular contact with a command and control server, which if needed, could provide new instructions or terminate the malware, although researchers note that during the analysis, no new commands were received. It's unknown who is behind Norman, but researchers suggest that the malware potentially emerged from France or another French-speaking country because there are various strings in the code of the malware which are written in French.

The organisation that was found to be infected with cryptominers has now need cleaned out the malware, but it could have avoided falling victim in the first place by following some simple security steps. Organisations should keep operating systems and software up to date by applying patches and security updates — many forms of malware take advantage of known vulnerabilities, but if the correct patch has been applied, it can prevent the vulnerabilities being exploited.

When it comes to cryptominers specifically, organisations should monitor CPU activity on computers. Before we get started, if you'd like definitions of a few key terms concerning cryptocurrency, please see the Crypto Cheatsheet in my previous article. But of course, crypto veterans feel free to skip this section. In February , they began their bitcoin mining operation.

Bitcoin miners use specialized hardware, known as miners, to generate bitcoins, a cryptocurrency. The mining units operate using computational power to provide transaction verification services known as "solving a block" which helps to maintain the bitcoin blockchain.

For each block added to the bitcoin blockchain, a bitcoin prize is paid out in accordance with a set amount of bitcoins per block. The aim of most bitcoin miners has been to mine bitcoin as quickly and as many as feasible, given the fixed quantity of bitcoins. A miner's hashrate relative to the overall network determines how likely it is to solve a block and earn a bitcoin reward, which is what causes the hashrate arms race we've been seeing in this space.

Second Quarter Highlights On August 20, the firm published its financial results for the second quarter ended June 30, By the end of the quarter, approximately The firm had 32, miners in its fleet, with a total hashrate of 1. The firm's second-quarter reduction of 0.

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In , Stantinko's operators added a new cryptocurrency mining module to generate further illicit revenues and also expanded its victim pool to Russia, Ukraine, Belarus, and Kazakhstan. The ESET malware analyst added that some of the techniques have not yet been "publicly described.

The first technique relies on strings, constructed in memory, that are only present in memory when they are used. According to ESET, all of the strings embedded in the cryptocurrency module are unrelated to the miner's actual functionality, and "they either serve as building blocks for constructing the strings that are actually used or they are not used at all. Control-flow obfuscation changes the control flow to a form that is hard to read and the execution of orders of basic blocks is considered "unpredictable.

A control variable determines which block is meant to be executed. CNET: Elections amid coronavirus: How officials aim to keep voters safe In addition, the module's use of control-flow obfuscation includes two "head and tail" control blocks that control the function. The head decides on which dispatch needs to be executed, whereas the tail increases the control variable using a fixed constant and either goes back to the head or exits the loop.

The module also merges some basic blocks when dispatches are connected. According to security researchers at Malwarebytes, who discovered the new Hidden Bee campaign, the attackers appear to be targeting victims in Asian countries. The researchers also discovered that unlike other exploit kits, which generally use encryption to obfuscate their landing page and exploits, Underminer requires a key exchange with the backend server to decrypt and execute the exploit.

This was perhaps the first case of a bootkit being used to enslave machines mining cryptocurrencies. The attackers behind the campaign also had not used the Flash Player exploit previously. According to Malwarebytes researchers, the entire exploitation and payload retrieval process of the campaign is fairly complicated, especially given that this is a drive-by campaign.

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