Κυκλοφόρησε η τέταρτη ενημέρωση του χειρότερου ransomware που κυκλοφορεί αυτή τη στιγμή. Το Cryptowall 4 ήρθε με διαφορετική τακτική κρυπτογράφησης και καλύτερα κόλπα απόκρυψης που έχουν σχεδιαστεί για να ξεγελάσουν τις γνστές πλατφόρμες protectionfrom viruses.
For those who don't know Ransomware invades business and personal computers with random or targeted attacks that encrypt the victim's files and demand a ransom for their decryption.
Το χειρότερο malware μέχρι σήμερα θεωρείται το Cryptowall (η έκδοση 3.0 που ήταν και η τελευταία πριν από τη νέα). Από επιθέσεις μόνο στις USA fraudsters have managed to rake in $325 million this year, according to the Cyber Threat Alliance, surpassing June FBI figures that reported $18 million in profits from the US for 2015.
Andra Zaharia of Heimdal Security he says that Cryptowall 4.0 comes with "vastly improved" communications and better code to exploit more vulnerabilities points.
“Cryptowall 4.0 still includes advanced malware dropper mechanisms to avoid virus detection, but this new version features greatly improved possibilities communication," Zaharia says.
"It includes a modified protocol that allows it to evade detection, even by business solutions second generation firewall.
"This reduces detection rates significantly compared to already successful attacks from Cryptowall 3.0."
For example, the new version of the malware changes the file names as well as the contents of the file, making it more difficult for victims to find what is already encrypted.
Cryptowall 4.0 continues as its predecessors are being distributed using hacked web pages to deliver payloads including botnet componentry that further aids in malware delivery.