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What is crypto ransomware
While CNA has been tight-lipped on the details of the negotiation and transaction, but says all of its systems have since been fully restored. CWT On July 31, , US business travel management firm CWT disclosed it had been impacted by a ransomware attack that infected its systems -- and that it had paid the ransom. Using ransomware called Ragnar Locker, the assailants claimed to have stolen sensitive corporate files and knocked 30, company computers offline. According to the BBC, Netwalker was also identified as the culprit in at least two other ransomware attacks targeting universities.
The attackers made off with 5GB of customer data, including dates of birth, credit card information, and insurance details. Travelex took down its website in 30 countries in an attempt to contain the virus. In the wake of the ransomware attack, Travelex struggled with customer services.
The WannaCry vulnerability was revealed during a massive leak of NSA documents and hacking tools engineered by a group called Shadow Brokers in April Though the exact number of WannaCry victims remains unknown, more than , computers around the world were infected. However, some researchers claim that no one got their data back, even if they met the demands. WannaCry attacks continue to this day. Locky Discovered in February , Locky is notable due to the incredibly high number of infection attempts it's made on computer networks.
Attacks typically come in the form of an email with an invoice attached from someone claiming to be a company employee. On February 16, analysis from Check Point identified more than 50, Locky attacks in one day. Locky has many variants , but the goal is largely the same: Lock computer files to entice owners to pay a ransom in cryptocurrency in exchange for a decryption tool, which would allow users to regain access to their locked files.
The majority of Locky victims have been in the US, and especially among health care companies , but Canada and France experienced significant infection rates as well. TeslaCrypt Modeled on an earlier program called CryptoLocker, the earliest TeslaCrypt samples were circulated in November but the ransomware was not widely distributed until March of the following year. TeslaCrypt initially targeted gamers. In May , the developers of TeslaCrypt released a master decryption key for affected users to unlock their computers.
CryptoWall Widespread reports of computer systems infected from the CryptoWall ransomware emerged in Infected computers were unable to access files -- unless the owner paid for access to a decryption program. CryptoWall impacted systems across the globe. The attackers demanded payment in the form of prepaid cards or bitcoin.
Multiple versions of CryptoWall were released, with each version making the ransomware more difficult to trace and combat. CryptoLocker The first time much of the world heard the term "ransomware" was during 's CryptoLocker outbreak. Bad Rabbit Bad Rabbit was a ransomware attack from that spread via so-called drive-by attacks. Insecure websites were used to carry out the attacks. In a drive-by ransomware attack, a user visits a real website, unaware that it has been compromised by hackers. For most drive-by attacks, all that is required is for a user to call up a page that has been compromised in this way.
In this case, however, running an installer that contained disguised malware led to the infection. This is called a malware dropper. Bad Rabbit asked the user to run a fake Adobe Flash installation, thereby infecting the computer with malware. Ryuk Ryuk is an encryption Trojan that spread in August and disabled the recovery function of Windows operating systems. This made it impossible to restore the encrypted data without an external backup.
Ryuk also encrypted network hard disks. The impact was huge, and many of the US organizations that were targeted paid the ransom sums demanded. Interestingly, the Troldesh attackers communicated directly with their victims via email. Victims with whom they had built up a "good relationship" received discounts. However, this kind of behavior is an exception rather than the rule. Jigsaw Jigsaw is a ransomware attack that began in The attack got its name from an image it displayed of the well-known puppet from the Saw movie franchise.
With each additional hour the ransom remained unpaid, Jigsaw ransomware deleted more files. The use of the horror movie image caused additional stress among users. CryptoLocker CryptoLocker is ransomware that was first spotted in and spread via infected email attachments. The ransomware searched for important data on infected computers and encrypted it. An estimated , computers were affected. Law enforcement agencies and security companies eventually managed to seize control of a worldwide network of hijacked home computers that were used to spread CryptoLocker.
This allowed the agencies and companies to intercept the data being sent over the network without the criminals noticing. Ultimately, this resulted in an online portal being set up where victims could obtain a key to unlock their data. This allowed their data to be released without the need to pay a ransom to the criminals. Petya Petya not to be confused with ExPetr is a ransomware attack that occurred in and was resurrected as GoldenEye in Instead of encrypting certain files, this malicious ransomware encrypted the victim's entire hard disk.
Petya ransomware spread to corporate HR departments via a fake application that contained an infected Dropbox link. Another variant of Petya is Petya 2. In terms of how the attack is carried out, however, both are equally fatal for the device. GoldenEye The resurrection of Petya as GoldenEye resulted in a worldwide ransomware infection in GoldenEye, known as WannaCry's "deadly sibling," hit more than 2, targets — including prominent oil producers in Russia and several banks. In an alarming turn of events, GoldenEye forced the personnel of the Chernobyl nuclear power plant to manually check the radiation level there, after they were locked out of their Windows computers.
GandCrab GandCrab is unsavory ransomware that threatened to disclose the porn habits of its victims. It claimed that it had hacked the victim's webcam and demanded a ransom. If the ransom wasn't paid, embarrassing footage of the victim would be published online. After its first appearance in , GandCrab ransomware continued to develop in various versions. As part of the "No More Ransom" initiative, security providers and police agencies developed a ransomware decryption tool to help victims recover their sensitive data from GandCrab.
B0r0nt0k B0r0nt0k is crypto ransomware that focuses specifically on Windows and Linux-based servers. This harmful ransomware encrypts the files of a Linux server and attaches a ". The malware not only poses a threat to files, it also makes changes to startup settings, disables functions and applications, and adds registry entries, files and programs.
Dharma Brrr ransomware Brrr, the new Dharma ransomware, is installed manually by hackers who then hack into desktop services connected to the internet. As soon as the ransomware is activated by the hacker, it begins to encrypt the files it finds. Encrypted data is given the file extension ". Using a powerful algorithm, all private documents and files of the victim are encrypted.
Files that are encrypted with this malware have the file extension ". Data that has been encrypted by this ransomware is given the extension ". Ransomware attacks As already mentioned, ransomware finds its targets in all walks of life.
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