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Microsoft Hijacks Necurs Botnet that Infected 9 Million PCs Worldwide

Microsoft Hijacks Necurs Botnet that Infected 9 Million PCs Worldwide

March 10, 2020Wang Wei
Microsoft today announced that it has successfully disrupted the botnet network of the Necurs malware, which has infected more than 9 million computers globally, and also hijacked the majority of its infrastructure. The latest botnet takedown was the result of a coordinated operation involving international police and private tech companies across 35 countries. The operation was conducted successfully after researchers successfully broke the domain generation algorithm (DGA) implemented by the Necurs malware, which helped it remain resilient for a long time. DGA is basically a technique to unpredictably generate new domain names at regular intervals, helping malware authors to continuously switch the location of C&C servers and maintain undisrupted digital communication with the infected machines. "We were then able to accurately predict over six million unique domains that would be created in the next 25 months. Microsoft reported these domains to their respective r
Jaff Ransomware Decryption Tool Released – Don't Pay, Unlock Files for Free

Jaff Ransomware Decryption Tool Released – Don't Pay, Unlock Files for Free

June 15, 2017Swati Khandelwal
Hit by Jaff Ransomware? Don't pay the Ransom. You can unlock your files for Free! Kaspersky Labs has released an updated version 1.21.2.1 of its free ransomware decryption tool, RakhniDecryptor, which can now also decrypt files locked by the Jaff ransomware . Security researchers at Kaspersky Labs have discovered a weakness in the Jaff ransomware code that makes it possible for victims to unlock their Jaff-infected files for free. First identified last month, Jaff is relatively new ransomware that's being distributed with the help of ' Necurs botnet ' that currently controls over 6 million infected computers worldwide. Necurs botnet is the same botnet – army of compromised internet connected devices – that was used to distribute Dridex Banking Trojan and Locky ransomware , which also infects users' machines, encrypt files and then demand a ransom before unlocking them. Jaff ransomware (Trojan-Ransom.Win32.Jaff) attack is primarily carried out by sending
Botnet Sending 5 Million Emails Per Hour to Spread Jaff Ransomware

Botnet Sending 5 Million Emails Per Hour to Spread Jaff Ransomware

May 12, 2017Mohit Kumar
A massive malicious email campaign that stems from the Necurs botnet is spreading a new ransomware at the rate of 5 million emails per hour and hitting computers across the globe. Dubbed "Jaff," the new file-encrypting ransomware is very similar to the infamous Locky ransomware in many ways, but it is demanding 1.79 Bitcoins (approx $3,150), which much higher than Locky, to unlock the encrypted files on an infected computer. According to security researchers at Forcepoint Security Lab, Jaff ransomware, written in C programming language, is being distributed with the help of Necurs botnet that currently controls over 6 million infected computers worldwide. Necurs botnet is sending emails to millions of users with an attached PDF document, which if clicked, opens up an embedded Word document with a malicious macro script to downloads and execute the Jaff ransomware, Malwarebytes says . Jaff is Spreading at the Rate of 5 Million per Hour The malicious email camp
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